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Journal articles on the topic 'Polymer Pair'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Ptak, Anita, and Adrianna Łukaszyk. "INFLUENCE OF CONTACT TIME WITH LUBRICANTON POLYMER-POLYMER SLIDING PAIR INTERACTION." Tribologia 308, no. 2 (2024): 87–93. http://dx.doi.org/10.5604/01.3001.0054.8431.

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This paper presents tribological investigations of pairs of same-type construction polymers: PET, PA6, andPOM, which for different durations were in contact with a lubricant. Hydraulic oil HLP 68, used for heavilyloaded drive systems, was the lubricant. Test samples were subjected to storage in this lubricating mediumfor different lengths of time: ranging from no storage to 2 weeks of storage. The static friction coefficient,which has a significant bearing on the startup of systems, was studied. Furthermore, investigations aimed atidentifying the phenomena involved in the interaction of the polymer-polymer sliding pair were carried out.The duration of the storage of the polymeric materials in the lubricating medium has been found to have avisible effect on static friction coefficient values and surface hardness and condition.

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2

An, Changwei, Jun Zhang, and Xianqi Guan. "CO₂ Adsorption Based on Porphyrin Based Porous Organic Polymers." Journal of Physics: Conference Series 2463, no. 1 (2023): 012057. http://dx.doi.org/10.1088/1742-6596/2463/1/012057.

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Abstract In order to efficiently catalyze the cycloaddition reaction of CO2 and epoxy alkanes under mild environment and no catalyst, this paper designed and synthesized two kinds of porphyrin based porous organic polymers—porphyrin based porous organic polymer containing carboxyl group (ppop-cooh) and porphyrin based porous organic polymer containing quaternary ammonium salt ion pair. Quaternary ammonium salt cation anion pair nucleophilic groups and metal active centers were introduced into the polymer by pre- and post-modification respectively. The chemical structure and pore structure of the polymer were characterized by infrared spectroscopy and physical adsorption instrument, and its effect as a catalyst on the cycloaddition reaction of CO2 and epoxy alkanes was studied. From the results, it is demonstrated that the two polymers had a multistage pore structure with a specific surface area of 302 m2/g-514 m2/g. The synergistic effect of Lewis acid metal ions, nucleophiles and multistage pore structure in the polymer significantly promotes the cycloaddition reaction between CO2 and epoxy alkanes. Under mild conditions (80°C, 0.3 MPa, 24h), the selectivity and conversion of the reaction reach more than 99%. The polymer is repeated for many times. After use, it still has good catalytic performance.

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3

Seo, Y., and H. Kim. "Reactive Compatibilized Polymer-Polymer Interface : Amorphous and Semi-crystalline Polymer Pair." International Journal of Material Forming 1, S1 (2008): 795–98. http://dx.doi.org/10.1007/s12289-008-0295-6.

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4

Ptak, Anita, and Zuzanna Łuksza. "Using Standstill Time to Evaluate the Startup in Polymer Pair Systems." Polymers 15, no. 24 (2023): 4696. http://dx.doi.org/10.3390/polym15244696.

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The subject of polymer–polymer pair interaction is highly important, bearing in mind that such pairs are used in the construction of machines and equipment, among other uses. Considering that the characteristics of polymer–polymer sliding pairs (e.g., the load limit value and advantageous parameter, PV) differ from those of polymer–metal pairs, the subject is particularly interesting and has been little explored so far. Hence, the present study presents one of the areas of the effects of standstill time (intrinsically characteristic of polymeric materials) on the startup parameters in sliding pairs where the sample and the countersample were made of a polymeric material. Pairs of same-type polymers, POM–POM, PET–PET, and PA6–PA6, were subjected to tests. A test rig dedicated to static friction coefficient determination, whose principle of operation is based on the interdependences between the force characteristics of an inclined plane, was used for this purpose. The sliding pair was successively loaded with 25 N, 50 N, and 75 N, and the standstill time ranged from 0 to 10 min. The determined tribological characteristics were analysed with regard to the standstill time under load, unit pressure, and polymer pair material. An optical profilometer and a scanning electron microscope were used to qualitatively evaluate the effects of standstill time and unit pressure on the surfaces of the interacting elements. Complex interrelationships between the test results and the set experimental parameters were noted. SEM micrographs revealed post-friction changes in the sliding surfaces.

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5

C., BHATTACHARYYA, N. BHATTACHARYYA S., and M. MANDAL B. "Poly(vinyl propionate) and Poly(ethyl acrylate)- A Miscible Polymer Pair." Journal of Indian Chemical Society Vol. 63, Jan 1986 (1986): 157–60. https://doi.org/10.5281/zenodo.6255725.

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Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Calcutta-700 092 A new miscible polymer pair, <em>viz. </em>poly(vinyl propionate) (PVPr) and poly(ethyl acrylate) (PEA) is reported. Blends of these polymers form clear films, clear solutions in common solvents and have single glass transition temperatures. Miscibility of these two polymers in binary combinations with poly(methyl acrylate) (PMA) or poly(vinyl acetate) (PVA) was also examined. Differential scanning calorimetry (D.S.C.) reveals that PVPr+PVA, PEA +PVA, PMA+PVPr and PMA +PEA are immiscible, although the first three pairs form clear films.

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6

KUJAWA, Maciej, and Wojciech WIELEBA. "THE INFLUENCE OF A CONSTANT STATE OF DEFORMATION ON THE FRICTION COEFFICIENT IN SELECTED THERMOPLASTICS (POLYMER–STEEL PAIR)." Tribologia, no. 4 (August 31, 2017): 39–45. http://dx.doi.org/10.5604/01.3001.0010.5992.

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The effect of tensile deformation on polymer structures and their mechanical properties is described in various papers. However, the majority of articles are focused on high deformation (a few hundred percentiles) at increased temperature. It causes changes in orientation and the crystallinity ratio. The authors of this paper asses the influence of strain (max. 50%) on hardness and the coefficient of friction (polymer–steel A1 couple) for selected polymers. The deformation was conducted at room temperature and maintained during tests. There was a significant reduction (up to 50%) of hardness after deformation, in the case of all examined polymers. In the case of PE-HD, the coefficient of kinetic friction almost doubled its value (89% increase). The reduction of the coefficient of static friction for sliding pairs that include PTFE and PA6 was about 26% (in comparison with non-deformed polymer). For all investigated polymers, hardness increased over time (up to 40% after 24 hours). Coefficients of static and kinetic friction decreased in 24 hours (up to 29% coefficient of static friction and 19% coefficient of kinetic friction). The research shows that a small deformation causes changes in polymer properties. Moreover, these changes appear at room temperature directly after deformation.

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7

Dell, Zachary E., and Kenneth S. Schweizer. "Intermolecular structural correlations in model globular and unconcatenated ring polymer liquids." Soft Matter 14, no. 45 (2018): 9132–42. http://dx.doi.org/10.1039/c8sm01722k.

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We employ the field theoretic polymer integral equation theory to construct a segment-level theory for the pair structure and thermodynamics of dense liquids of simple globule and ring polymers. We find that the partially interpenetrating behavior of rings is reflected in a deeper correlation hole and in a limited number of neighbors, in stark contrast to chains.

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8

Albrecht, Ken, Yuki Hirabayashi, Masaya Otake, et al. "Polymerization of a divalent/tetravalent metal-storing atom-mimicking dendrimer." Science Advances 2, no. 12 (2016): e1601414. http://dx.doi.org/10.1126/sciadv.1601414.

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The phenylazomethine dendrimer (DPA) has a layer-by-layer electron density gradient that is an analog of the Bohr atom (atom mimicry). In combination with electron pair mimicry, the polymerization of this atom-mimicking dendrimer was achieved. The valency of the mimicked atom was controlled by changing the chemical structure of the dendrimer. By mimicking a divalent atom, a one-dimensional (1D) polymer was obtained, and by using a planar tetravalent atom mimic, a 2D polymer was obtained. These poly(dendrimer) polymers could store Lewis acids (SnCl2) in their unoccupied orbitals, thus indicating that these poly(dendrimer) polymers consist of a series of nanocontainers.

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9

Gowda, Ravikumar R., та Eugene Y. X. Chen. "Chemoselective Lewis pair polymerization of renewable multivinyl-functionalized γ-butyrolactones". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, № 2101 (2017): 20170003. http://dx.doi.org/10.1098/rsta.2017.0003.

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Multivinyl-functionalized γ-butyrolactones, γ-vinyl-γ-methyl-α-methylene-γ-butyrolactone ( γ VMMBL) and γ-allyl-γ-methyl-α-methylene-γ-butyrolactone ( γ AMMBL), have been synthesized from biorenewable ethyl levulinate and effectively polymerized by Lewis pairs consisting of an organic N -heterocyclic carbene Lewis base and a strong organo-Lewis acid E(C 6 F 5 ) 3 (E = Al, B). This Lewis pair polymerization is quantitatively chemoselective, proceeds exclusively via polyaddition across the conjugated α-methylene double bond without participation of the γ-vinyl or γ-allyl double bond, and produces high-molecular-weight functionalized polymers with unimodal molecular-weight distributions. The Al-based Lewis pair produces a polymer with approximately 5.5 times higher molecular weight than that produced by the B-based Lewis pair. The resulting vinyl-functionalized polymers are soluble in common organic solvents and stable at room temperature, and can be thermally cured into crosslinked materials. This article is part of the themed issue ‘Frustrated Lewis pair chemistry’.

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10

Zhang, Liwei, Heping Zheng, and Huilin Xie. "Molecular Dynamics Study on Interfacial Strengthening Mechanisms of Ettringite/Polymer Nanocomposites." Buildings 13, no. 12 (2023): 2976. http://dx.doi.org/10.3390/buildings13122976.

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Compared with polymer-modified ordinary-Portland-cement-based materials, research on cement materials based on polymer-modified sulfoaluminate is still in the preliminary stage and lacks an understanding of the mechanism of the interaction interface. The aim of this work is to study the bond performance of ettringite, the main hydration product of sulfoaluminate cement, with various types of polymers using molecular dynamics methods. Steered molecular dynamics were used to simulate the separation of polyamide (PA), polyethylene glycol (PEG), polyacrylic acid (PAA) and polypropylene (PP) from ettringite substrate, reflecting the order of bond properties of the four polymers: PAA > PA > PEG > PP. The internal mechanism of bond properties between different polymers and ettringite was analyzed by studying the local structure and dynamic characteristics. The results show that a Ca–O ionic pair is formed between the calcium ions on the surface of the polymer and ettringite substrate, resulting in strong interaction. In addition, the formation of a H bond also contributes to bond performance. The properties of the polymer itself, such as the degree of polymerization and branched-chain freedom, affect the coordination of the polymer to the substrate. This study provides valuable insights for advancing the development of polymer-modified sulfoaluminate-cement-based materials.

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11

Chremos, Alexandros, and Jack F. Douglas. "Influence of Branching on the Configurational and Dynamical Properties of Entangled Polymer Melts." Polymers 11, no. 6 (2019): 1045. http://dx.doi.org/10.3390/polym11061045.

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We probe the influence of branching on the configurational, packing, and density correlation function properties of polymer melts of linear and star polymers, with emphasis on molecular masses larger than the entanglement molecular mass of linear chains. In particular, we calculate the conformational properties of these polymers, such as the hydrodynamic radius R h , packing length p, pair correlation function g ( r ) , and polymer center of mass self-diffusion coefficient, D, with the use of coarse-grained molecular dynamics simulations. Our simulation results reproduce the phenomenology of simulated linear and branched polymers, and we attempt to understand our observations based on a combination of hydrodynamic and thermodynamic modeling. We introduce a model of “entanglement” phenomenon in high molecular mass polymers that assumes polymers can viewed in a coarse-grained sense as “soft” particles and, correspondingly, we model the emergence of heterogeneous dynamics in polymeric glass-forming liquids to occur in a fashion similar to glass-forming liquids in which the molecules have soft repulsive interactions. Based on this novel perspective of polymer melt dynamics, we propose a functional form for D that can describe our simulation results for both star and linear polymers, covering both the unentangled to entangled polymer melt regimes.

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12

Kurinomaru, Takaaki, Shunsuke Tomita, Shinpei Kudo, Sumon Ganguli, Yukio Nagasaki, and Kentaro Shiraki. "Improved Complementary Polymer Pair System: Switching for Enzyme Activity by PEGylated Polymers." Langmuir 28, no. 9 (2012): 4334–38. http://dx.doi.org/10.1021/la2043312.

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13

Wijmans, C. M., F. A. M. Leermakers, and G. J. Fleer. "Pair Potentials between Polymer-Coated Mesoscopic Particles." Langmuir 10, no. 12 (1994): 4514–16. http://dx.doi.org/10.1021/la00024a021.

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14

Schweitzer, B., V. I. Arkhipov, U. Scherf, and H. Bässler. "Geminate pair recombination in a conjugated polymer." Chemical Physics Letters 313, no. 1-2 (1999): 57–62. http://dx.doi.org/10.1016/s0009-2614(99)01014-3.

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15

Procacci, Aldo. "Abstract Polymer Models with General Pair Interactions." Journal of Statistical Physics 129, no. 1 (2007): 171–88. http://dx.doi.org/10.1007/s10955-007-9378-x.

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16

Bolhuis, P. G., A. A. Louis, J. P. Hansen, and E. J. Meijer. "Accurate effective pair potentials for polymer solutions." Journal of Chemical Physics 114, no. 9 (2001): 4296–311. http://dx.doi.org/10.1063/1.1344606.

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17

Opalka, Mariusz. "Static friction of normal and reversed metal–polymer sliding pairs." Materials Science-Poland 40, no. 3 (2022): 152–59. http://dx.doi.org/10.2478/msp-2022-0040.

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Abstract The frictional cooperation of materials with different hardnesses occurs in machine elements in one of the following two variants: simple or reversed friction pairs. For a simple sliding pair, the sliding materials' deformation area (contact area) does not move over the surface of the polymeric element during their interaction. In the case of reversed pairs, the contact surface changes its position as it moves over the surface of the polymer element. Tribological tests of selected sliding pairs (polymer on steel or steel on polymer) in static friction were carried out on a tribotester for tests in a reciprocating motion. The polymers selected for the research were popular sliding materials in engineering applications: ultra-high molecular weight polyethylene (PEUHMW), polyoxymethylene (POM) and polytetrafluoroethylene (PTFE). These materials cooperated with the C45 steel at different unit pressure (P = 0.5; 1; 2 [MPa]) in dry friction conditions. The measurement results showed a significant influence of the material combination variant (metal–polymer, polymer–metal) on the value of the friction coefficient. In all tested material combinations in which the steel sample (pin) slid over the polymer plate, the friction coefficient was higher than when the polymer sample worked with the steel plate.

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18

Chalykh, Anatoly E., Vladimir K. Gerasimov, Tatiana F. Petrova, and Anna A. Shcherbina. "Determination of Pair Interaction Parameters of Multicomponent Polymer Systems." Polymers 16, no. 1 (2023): 68. http://dx.doi.org/10.3390/polym16010068.

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From the examples of three and four-component polymer–polymer systems characterized by amorphous separation, an original technique for determining the pair parameters of interaction between components based on the sorption isotherms of common solvent vapor, particularly water vapor, has been developed. The possibility of calculating thermodynamic characteristics of multicomponent polymer compositions with specific interactions of functional groups from experimentally obtained sorption isotherms is shown. An algorithm for calculating pair interaction parameters, estimating concentration dependences of chemical potential and Gibbs free energy of mixing, and predicting the phase state of polymer mixtures was presented for the first time for such systems. The technique was tested on the example of systems poly(N-vinylpyrrolidone) (PNVP)–polyethylene glycol (PEG), PNVP–PEG–Poly(acrylic acid) (PAA), poly(N-vinylcaprolactam) (PNVCL)–PEG, and polyvinyl alcohol (PVA)–PEG.

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19

Kumar, Rajiv, and S. S. Sekhon. "Evidence of ion pair breaking by dispersed polymer in polymer gel electrolytes." Ionics 10, no. 5-6 (2004): 436–42. http://dx.doi.org/10.1007/bf02378005.

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20

Kumar, Rajiv, and S. S. Sekhon. "Evidence of ion pair breaking by dispersed polymer in polymer gel electrolytes." Ionics 10, no. 1-2 (2004): 10–16. http://dx.doi.org/10.1007/bf02410298.

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21

Chandran, Sivasurender, Shibu Saw, A. K. Kandar, C. Dasgupta, M. Sprung, and J. K. Basu. "Suspensions of polymer-grafted nanoparticles with added polymers—Structure and effective pair-interactions." Journal of Chemical Physics 143, no. 8 (2015): 084902. http://dx.doi.org/10.1063/1.4929438.

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22

Abramavicius, D., V. Gulbinas, A. Ruseckas, A. Undzenas, and L. Valkunas. "Geminate charge pair recombination in sensitized photoconducting polymer." Journal of Chemical Physics 111, no. 12 (1999): 5611–16. http://dx.doi.org/10.1063/1.479819.

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23

Hsieh, T. "Miscibility of a nematic liquid crystalline polymer pair." Polymer 42, no. 19 (2001): 8007–11. http://dx.doi.org/10.1016/s0032-3861(01)00331-7.

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24

Tomita, Shunsuke, Len Ito, Hiroshi Yamaguchi, Gen-ichi Konishi, Yukio Nagasaki, and Kentaro Shiraki. "Enzyme switch by complementary polymer pair system (CPPS)." Soft Matter 6, no. 21 (2010): 5320. http://dx.doi.org/10.1039/c000930j.

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25

PAWELEC, Zbigniew. "THE INFLUENCE OF THE FRICTION PAIR LOAD ON TRIBOLOGICAL CHARACTERISTICS OF POLYMER COMPOSITES IN RECIPROCATING MOTION." Tribologia 266, no. 2 (2016): 111–20. http://dx.doi.org/10.5604/01.3001.0010.7571.

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This paper presents the influence of the friction pair load on the wear and friction coefficient of polymer composites in reciprocating motion. The tested polymer composites are used in regeneration purposes of supports in cutting tools. Tribological characteristics were evaluated for composites modified with graphite and molybdenum disulphide as the additives (modifiers). The tests were performed by the use of T-17 tribotester under conditions of various loads (100, 150, 200 N), with a frequency of 1 Hz, and the 20 000 cycles of 25 mm amplitude. The friction pairs were lubricated with standard machine oil. For comparison purposes, the tribological characteristics of steel-steel configuration were performed. The mechanism of friction pair wear was evaluated by the analysis with scanning electron microscopy (SEM). The results have shown that the increase in the load of friction pair affects the friction coefficient only restrainedly. The polymer regeneration composites designed for flat guide rails in cutting machines proved to be more useful and resistant than the steel-steel combination.

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26

Biryukov, Vladimir. "Effect of polymer composition on mechanical and tribotechnical properties in a friction pair with steel." E3S Web of Conferences 592 (2024): 05021. http://dx.doi.org/10.1051/e3sconf/202459205021.

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The article presents the results of kinetic indentation and wear tests of polymer samples from ultrahigh molecular weight polyethylene (UHMWPE), high molecular weight polyethylene (HMWPE), polyethylene terephthalate (PET), polyoxymethylene (POM). The determination of the micromechanical properties of polymers was carried out on the Nanoscan-4D device. diamond triangular Berkovich pyramid with a maximum loading force of 10 mN. The values of microhardness HV, modulus of elasticity E, work on elastic deformation We, work on plastic deformation Wp were obtained. Wear tests were performed on a friction machine with a vertical axis of rotation according to the scheme: “three steel balls rigidly fixed in a mandrel (steel ShКh15) - the wide side of a rectangular polymer sample” without the use of lubricant at normal temperature. Patterns of changes in the depth of wear holes were established depending on the composition of the polymer. PET samples had minimal wear and had maximum wear resistance, followed by POM, UHMWPE and HMWPE samples in descending order of wear resistance. The microhardness values of the samples were determined, and its minimum values were obtained for UHMWPE, and the microhardness of PET, HMWPE and POM samples was 4.47, 1.45 and 1.18 times higher than that of UHMWPE, respectively. The work of elastic–plastic deformation had maximum values on UHMWPE samples, and minimum values on PET samples.

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27

Poon, Louis, Jacob R. Hum, and Richard G. Weiss. "Neat Linear Polysiloxane-Based Ionic Polymers: Insights into Structure-Based Property Modifications and Applications." Macromol 1, no. 1 (2020): 2–17. http://dx.doi.org/10.3390/macromol1010002.

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A diverse range of linear polysiloxane-based ionic polymers that are hydrophobic and highly flexible can be obtained by substituting the polymers with varying amounts of ionic centers. The materials can be highly crystalline solids, amorphous soft solids, poly(ionic) liquids or viscous polymer liquids. A key to understanding how structural variations can lead to these different materials is the establishment of correlations between the physical (dynamic and static) properties and the structures of the polymers at different distance scales. This short review provides such correlations by examining the influence of structural properties (such as molecular weights, ion pair contents, and ion types) on key bulk properties of the materials.

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28

WIELEBA, Wojciech, and Mariusz OPAŁKA. "STATIC FRICTION OF REVERSE STEEL–ELASTOMER SLIDING PAIRS." Tribologia 279, no. 3 (2018): 147–51. http://dx.doi.org/10.5604/01.3001.0012.7023.

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Sliding cooperation of materials with different hardness (deformability), e.g., a polymeric material cooperating with metallic materials, occurs in machine elements in one of the following two variants: a conventional pair or a reverse pair. In the case of the conventional sliding pair, the deformation area (contact area) of the sliding materials does not move on the surface of the polymer element during their cooperation. In the case of reverse pairs, the contact surface changes its position when moving on the surface of the polymer element. Depending on the variant of the sliding pair, the differences in the friction and wear process of polymer material can be observed. Tribological investigations of chosen sliding pairs (elastomer on steel or steel on elastomer) in the static friction were carried out on the rig. The polymeric materials selected for the tests were thermoplastic elastomers TPU, PUR, and silicone rubber SI. These materials co-operated with C45 steel in the different contact pressures (p = 0.1 – 0.26 MPa) under dry friction or mixed lubrication conditions (hydraulic oil Hipol HLP-68). Based on the recorded value of the friction force Ft, the values of static coefficients of friction μstat were determined. The test results showed a significant influence of the variant of the combination of materials (metal-polymer or polymer-metal) on the value of the friction coefficient. In all tested pairs in which steel sample (pin) slid against elastomeric plates, the friction coefficient was higher than in the case when the elastomeric sample (pins) cooperated with steel counterfaces (plates). The main reason is the considerable value of the deformation component of the friction force. This is probably due to the displacement of the elastomer deformation area in its surface layer and energy dissipation as a result of stress-strain hysteresis in the elastomeric material, as in the case with reversed pairs.

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29

Sabzi, Mohammad, Marziyeh Ranjbar‐Mohammadi, Qiwei Zhang, et al. "Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique." Journal of Applied Polymer Science 136, no. 19 (2019): 47471. http://dx.doi.org/10.1002/app.47471.

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30

Opałka, Mariusz, Wojciech Wieleba, and Angelika Radzińska. "INFLUENCE OF THE DYNAMICS OF FORCED MOTION ON THE STATIC FRICTION IN METAL-POLYMER SLIDING PAIRS." Tribologia 295, no. 1 (2021): 21–26. http://dx.doi.org/10.5604/01.3001.0015.4897.

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The resistance during the frictional interaction of polymeric materials with metallic materials is characterized by a significant dependence on the dynamics of the motion inputs. In a metal-polymer friction pair, the static friction resistance during standstill under load depends on the rate of growth of the force causing the relative motion. Tribological tests of selected (polymer-metal) sliding pairs were carried out. The selected polymers were polyurethane (TPU), polysulfone (PSU), and silicone rubber (SI). They interacted with a pin made of normalized C45 steel under unitary pressure p = 0.5 MPa in dry friction conditions at different gradients of the force driving the relative motion (dF/dt = 0.1-20 [N/s]). The static friction coefficient of the selected sliding pairs was determined on the basis of the recorded static friction force values. The test results show a significant influence of the rate of increase in the motion driving force on the values of static friction resistance. This is mainly due to the viscoelastic properties of polymers.

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31

Pessagno, Federica, Aliya Nur Hasanah, and Panagiotis Manesiotis. "Molecularly imprinted ‘traps’ for sulfonylureas prepared using polymerisable ion pairs." RSC Advances 8, no. 26 (2018): 14212–20. http://dx.doi.org/10.1039/c8ra01135d.

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32

Voyiatzis, Evangelos, and Michael C. Böhm. "How does the entropy of ternary polymer–solvent–cosolvent mixtures depend on the molar solvent fraction?" RSC Advances 6, no. 99 (2016): 97018–21. http://dx.doi.org/10.1039/c6ra23340f.

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NIGMATULLINA, A. I., and S. I. VOLFSON. "ASSESSMENT OF WETTING OF DISPERSED WOOD FLOUR PARTICLES BY THERMOPLASTIC POLYMERS AND ADHESION INTERACTION IN THE POLYMER-FILLER SYSTEM." Herald of Technological University 27, no. 7 (2024): 69–73. https://doi.org/10.55421/1998-7072_2024_27_7_69.

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The ability of low- and high-density polyethylene, polypropylene and polyvinyl chloride to wet the surface of dispersed particles of wood flour was assessed by comparing the values of the critical surface wetting tension of the polymer and filler. The critical surface tension of wood flour is determined by its dependence on the solubility parameter of the filler. It was revealed that wood flour has the highest value of critical surface tension, and thermoplastic polymers have lower values of critical surface tension. It has been shown that non-polar hydrophobic thermoplastic polymers poorly wet the hydrophilic surface of wood flour. The relationship between the parameters of solubility, polarity of the studied thermoplastics and filler and their critical surface wetting tension has been established. Moreover, the more the thermoplastics and the filler differ from each other in their polarity and solubility parameters, the greater the critical surface wetting tension at the boundary between them and the worse the wetting in this system. Wetting occurs when the critical surface tension of the filler is greater than the critical surface tension of the thermoplastic polymer at the filler-melt polymer interface. When the values of the critical surface tension of the filler and the polymer are equal, the spreading of the liquid polymer over the surface of the filler stops and the greatest adhesive strength between them is achieved. The energy and acid-base characteristics of the surface of the studied polymers and filler were determined. It was revealed that the surfaces of polyvinyl chloride, polypropylene, high-density polyethylene and wood flour have acidic properties. Low pressure polyethylene has basic properties. The results obtained, with the exception of the HDPE-wood flour pair, indicate the absence of acid-base interaction between the polymer matrix and wood flour. It has been established that in wood-polymer compositions the interaction between the polymer and the filler is weak and is determined only by intermolecular forces. The calculated values of adhesion of the studied polymers to wood flour are given. It has been shown that polyvinyl chloride has the greatest adhesion to the filler, and polypropylene has the least.

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Sedakova, E. B., and Yu P. Kozyrev. "Polymer thermal loading in the polytetrafluoroethylene–steel friction pair." Journal of Friction and Wear 38, no. 5 (2017): 390–94. http://dx.doi.org/10.3103/s1068366617050117.

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35

Gudla, Harish, Yunqi Shao, Supho Phunnarungsi, Daniel Brandell, and Chao Zhang. "Importance of the Ion-Pair Lifetime in Polymer Electrolytes." Journal of Physical Chemistry Letters 12, no. 35 (2021): 8460–64. http://dx.doi.org/10.1021/acs.jpclett.1c02474.

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36

Miller, J. D. "Exact Pair Correlation Function of a Randomly Branched Polymer." Europhysics Letters (EPL) 16, no. 7 (1991): 623–28. http://dx.doi.org/10.1209/0295-5075/16/7/003.

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37

Shcherbina, A. A., V. K. Gerasimov, and A. E. Chalykh. "Determination of pair interaction parameters for multicomponent polymer blends." Russian Chemical Bulletin 53, no. 11 (2004): 2601–3. http://dx.doi.org/10.1007/s11172-005-0160-4.

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38

Surve, Megha, Victor Pryamitsyn, and Venkat Ganesan. "Depletion and pair interactions of proteins in polymer solutions." Journal of Chemical Physics 122, no. 15 (2005): 154901. http://dx.doi.org/10.1063/1.1872772.

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39

Yan, Hui, and Heinz W. Siesler. "Identification Performance of Different Types of Handheld Near-Infrared (NIR) Spectrometers for the Recycling of Polymer Commodities." Applied Spectroscopy 72, no. 9 (2018): 1362–70. http://dx.doi.org/10.1177/0003702818777260.

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For sustainable utilization of raw materials and environmental protection, the recycling of the most common polymers—polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), and polystyrene (PS)—is an extremely important issue. In the present communication, the discrimination performance of the above polymer commodities based on their near-infrared (NIR) spectra measured with four real handheld (<200 g) spectrometers based on different monochromator principles were investigated. From a total of 43 polymer samples, the diffuse reflection spectra were measured with the handheld instruments. After the original spectra were pretreated by second derivative and standard normal variate (SNV), principal component analysis (PCA) was applied and unknown samples were tested by soft independent modeling of class analogies (SIMCA). The results show that the five polymer commodities cluster in the score plots of their first three principal components (PCs) and, furthermore, samples in calibration and test sets can be correctly identified by SICMA. Thus, it was concluded that on the basis of the NIR spectra measured with the handheld spectrometers the SIMCA analysis provides a suitable analytical tool for the correct assignment of the type of polymer. Because the mean distance between clusters in the score plot reflects the discrimination capability for each polymer pair the variation of this parameter for the spectra measured with the different handheld spectrometers was used to rank the identification performance of the five polymer commodities.

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Matheson, Andrew B., Arvydas Ruseckas, Scott J. Pearson, and Ifor D. W. Samuel. "Hole delocalization as a driving force for charge pair dissociation in organic photovoltaics." Materials Horizons 6, no. 5 (2019): 1050–56. http://dx.doi.org/10.1039/c8mh01204k.

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41

Li, Zhenqing, Chenchen Liu, Yoshinori Yamaguchi, Yi Ni, Qingxiang You, and Xiaoming Dou. "Capillary electrophoresis of a wide range of DNA fragments in a mixed solution of hydroxyethyl cellulose." Anal. Methods 6, no. 8 (2014): 2473–77. http://dx.doi.org/10.1039/c3ay41965g.

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42

Zielińska, Paulina, and Waldemar Ziaja. "Mechanical properties of selected polymer sandwich composites." Advances in Mechanical and Materials Engineering 40 (2023): 103–11. http://dx.doi.org/10.7862/rm.2023.11.

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The aim of this work was to determine the influence of material and geometric factors of selected sandwich composites on their mechanical properties. The first pair of sandwich materials under consideration were made by the industrial infusion method and consisted of epoxy resin reinforced with 7 layers of glass fabric (skin) with core made of PVC foam or aramid honeycomb. The second pair of materials was prepared manually and consisted of polyester resin reinforced with glass mat (skin) with aramid honeycomb core of varying thicknesses. Mechanical properties were determined in static bending, compression and tensile tests. In each case, the failure mode of the tested composite materials was determined. In the case of composites with epoxy resin skins application of aramid honeycomb core resulted in higher tensile and edgewise compressive strength. For materials with polyester resin skins and honeycomb cores it was found that increase of core thickness yielded higher bending stiffness but the tensile and bending strength were reduced.

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43

Mu, Cheng, Peng Liu, Wei Ma, et al. "High-Efficiency All-Polymer Solar Cells Based on a Pair of Crystalline Low-Bandgap Polymers." Advanced Materials 26, no. 42 (2014): 7224–30. http://dx.doi.org/10.1002/adma.201402473.

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Lee, Albert S. "Intrinsically Microporous Ion-Pair Membranes for HT-PEMFCs." ECS Meeting Abstracts MA2024-01, no. 36 (2024): 2036. http://dx.doi.org/10.1149/ma2024-01362036mtgabs.

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Fuel cells are electrochemical devices with high energy efficiency expected to be applied economically and eco-friendly across various energy sectors. Low-temperature polymer electrolyte membrane fuel cells (LT-PEMFCs) using Nafion operates at a relatively low operating temperature (60-80°C) and fully hydration condition. HT-PEMFC is operable at high temperatures (140-180°C), but requires anhydrous conditions to avoid loss of doped phosphoric acid (PA). In this presentation, polymer membranes designed through with intrinsic microporosity were synthesized through super acid polycondensation. We demonstrated that high proton conductivity (106.33 mS cm-1 at 180℃) is obtained by forming phosphoric acid filled ion-channels within the interconnected microporous structure. Moreover, ion-pair coordinated PIMs are fabricated by methylation of PIMs to improve PA retention even under humidified conditions. It is suggested that the water tolerance of ion-pair coordinated PIMs is improved and can be operated under various conditions regardless of humidification and operating temperature and exceptional membrane electrode assembly performance and durability achieved even under humidified reformate gas conditions.

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45

ZHANG, SHU-GUANG, FENG-YUN WANG, and XIAO-YAO TAN. "MOLECULAR DYNAMICS SIMULATION THE HYDROXYAPATITE SCALE INHIBITION MECHANISM OF WATER-SOLUBLE POLYMERS." Journal of Theoretical and Computational Chemistry 09, no. 05 (2010): 889–902. http://dx.doi.org/10.1142/s0219633610006067.

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Molecular dynamics (MD) method was used to simulate the interaction between water-soluble polymers, such as polyacrylic acid (PAA), polymethylacrylic acid (PMAA), acrylic acid-methylacrylate copolymer (AA-MAE), acrylic acid-hydroxypropyl acrylate copolymer (AA-HPA), hydrolyzed polymaleic anhydride (HPMA), acrylic acid-maleic acid copolymer (AA-MA), and hydroxyapatite crystal. The sequence of binding energies of polymers binding with the (100) crystal surface of hydroxyapatite was as follows: AA-HPA > AA-MA > HPMA > PAA > AA-MAE > PMAA. After analyzing various energy components and pair correlation functions of all systems, it could be concluded that binding energies were mainly determined by Coulomb interaction. Polymers deformed during their combining with the hydroxyapatite crystal, but all the deformation energies were far less than respective nonbond energies. The dynamics behavior of carboxyls located at different positions of the polymer chains manifested different features during the processes of MD runs. Carboxyls at the ends of the polymer chains oscillated more acutely than those in the middle of the chains; therefore, the latter ones inhibited scale crystal growth more effectively than the former ones because they combined with hydroxyapatite crystal more firmly.

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Mohideen, M. Infas, Phoebe K. Allan, Karena W. Chapman, Joseph A. Hriljac, and Russell E. Morris. "Ultrasound-driven preparation and pair distribution function-assisted structure solution of a copper-based layered coordination polymer." Dalton Trans. 43, no. 27 (2014): 10438–42. http://dx.doi.org/10.1039/c3dt53124d.

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47

Unitsky, Anatoli E., Aliaksandr S. Khlebus, Elena A. Ivanova, Aliaksandr E. Shashko, and Michael I. Tsyrlin. "Simulation of the contact pair “wheel-rail” of the experimental design of the flexible rail in the lightweight tracks of the uST string transport system." Modern Transportation Systems and Technologies 8, no. 4 (2022): 107–25. http://dx.doi.org/10.17816/transsyst202284107-125.

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Rationale: Development of string rails with low weight per meter and high-performance characteristics that determine durability, wear resistance, reliable grip of vehicle wheels to the rail rolling surface is a vital task. Objective: to investigate impact of the geometric parameters of the steel wheel and the flexible string rail with a polymer coating on the performance characteristics; to choose the most optimal parameters of the contact pair wheel-rail. Methods: The calculation was made using the ANSYS finite element analysis software package. Results: in order to reduce the level of contact pressures, it is more expedient to lower the load on the wheel or increase the width of the contact, rather than to increase the radius of the wheel; the most optimal is the contact pair, where the modulus of elasticity of the polymer rail head is equal to the modulus of elasticity of the wheel material, that is, materials similar in elasticity are used in the contact pair.

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Lee, Kwan-Soo, Sandip Maurya, Yu Seung Kim, et al. "Intermediate temperature fuel cells via an ion-pair coordinated polymer electrolyte." Energy & Environmental Science 11, no. 4 (2018): 979–87. http://dx.doi.org/10.1039/c7ee03595k.

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49

Lee, Albert S., Jinsuk Gu, Jiyoon Jung, Young Sang Park, and Jung-Hyun Lee. "Intrinsically Microporous Ion-Pair Coordinated Membranes for HT-Pemfcs." ECS Meeting Abstracts MA2022-02, no. 50 (2022): 2443. http://dx.doi.org/10.1149/ma2022-02502443mtgabs.

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Abstract:

Fuel cells are electrochemical devices with high energy efficiency expected to be applied economically and eco-friendly across various energy sectors. Low-temperature polymer electrolyte membrane fuel cells (LT-PEMFCs) using Nafion operates at a relatively low operating temperature (60-80°C) and a full hydration condition. HT-PEMFC is operable at high temperatures (140-180°C), but requires anhydrous conditions to avoid loss of doped phosphoric acid (PA). In this study, polymer membranes designed through with intrinsic microporosity were synthesized through super acid polycondensation. We demonstrated that high proton conductivity (106.33 mS cm-1 at 180℃) is obtained by forming phosphoric acid filled ion-channels within the interconnected microporous structure. Moreover, ion-pair coordinated PIMs are fabricated by methylation of PIMs to improve PA retention even under humidified conditions. It is suggested that the water tolerance of ion-pair coordinated PIMs is improved and can be operated under various conditions regardless of humidification and operating temperature.

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50

Hu, Junli, Yadong Han, Xiuli Zhuang, Xuesi Chen, Yuesheng Li, and Xiabin Jing. "Self-assembly of a polymer pair through poly(lactide) stereocomplexation." Nanotechnology 18, no. 18 (2007): 185607. http://dx.doi.org/10.1088/0957-4484/18/18/185607.

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