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Journal articles on the topic 'Melt elasticity'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Xanthos, M., and D. W. Yu. "Instrumentation news: Measuring melt elasticity—the melt elasticity indexer." Advances in Polymer Technology 10, no. 3 (1990): 243–44. http://dx.doi.org/10.1002/adv.1990.060100309.

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2

Shenoy, A. V., and D. R. Saini. "Estimation of melt elasticity of degraded polymer from melt flow index." Polymer Degradation and Stability 11, no. 4 (January 1985): 297–307. http://dx.doi.org/10.1016/0141-3910(85)90034-5.

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3

Utracki, L. A. "Rheology of PVC. Part 5: Melt elasticity." Journal of Vinyl and Additive Technology 8, no. 4 (December 1986): 156–59. http://dx.doi.org/10.1002/vnl.730080405.

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4

Saengow, C., A. J. Giacomin, and C. Kolitawong. "Knuckle formation from melt elasticity in plastic pipe extrusion." Journal of Non-Newtonian Fluid Mechanics 242 (April 2017): 11–22. http://dx.doi.org/10.1016/j.jnnfm.2017.02.003.

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5

Joseph, Susan, Zachariah Oommen, and Sabu Thomas. "Melt elasticity and extrudate characteristics of polystyrene/polybutadiene blends." Materials Letters 53, no. 4-5 (April 2002): 268–76. http://dx.doi.org/10.1016/s0167-577x(01)00491-8.

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6

Maxwell, Bryce. "The application of melt elasticity measurements to polymer processing." Polymer Engineering and Science 26, no. 20 (November 1986): 1405–9. http://dx.doi.org/10.1002/pen.760262009.

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7

Резанова, Н. М., та А. Ю. Сад. "ВПЛИВ НАНОНАПОВНЮВАЧА НА РЕОЛОГІЧНІ ВЛАСТИВОСТІ РОЗПЛАВІВ ПОЛІМЕРІВ ТА ЇХ СУМІШЕЙ". Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 126, № 5 (12 лютого 2019): 106–13. http://dx.doi.org/10.30857/1813-6796.2018.5.12.

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Studying the influence of additives of nano-sized aluminium oxide on the patterns of Polypropylene (PP) and mixture PP/CPA (copolyamide) melt flow. The mixtures were obtained by the prior injection of the nano-filler to the PP melt with the further mixing of granula with CPA on the worm-disk extruder. Viscosity (η) of melts was examined by the method of capillary viscometry and the elasticity was studied by value of extrudate equilibrium swelling. The melts ability to longitudinal deformation was evaluated by the maximum stretch rating.

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8

Capuano, G., G. Filippone, G. Romeo, and D. Acierno. "Universal Features of the Melt Elasticity of Interacting Polymer Nanocomposites." Langmuir 28, no. 12 (March 12, 2012): 5458–63. http://dx.doi.org/10.1021/la205105m.

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9

Khanna, Y. P., and K. R. Slusarz. "Dynamic melt rheology. II: Re-examining the relationship ofg′ in oscillatory rheometry to the melt elasticity." Polymer Engineering and Science 33, no. 2 (January 1993): 122–24. http://dx.doi.org/10.1002/pen.760330211.

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10

Mavrantzas, Vlasis G., and Doros N. Theodorou. "Atomistic Simulation of Polymer Melt Elasticity: Calculation of the Free Energy of an Oriented Polymer Melt." Macromolecules 31, no. 18 (September 1998): 6310–32. http://dx.doi.org/10.1021/ma9714878.

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11

Hong, XU, WU Daming, LIU Ying, and ZHANG Yajun. "Research on Measurement Method for Polymer Melt Bulk Modulus of Elasticity." Procedia Engineering 16 (2011): 72–78. http://dx.doi.org/10.1016/j.proeng.2011.08.1054.

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12

Ignat’ev, I. E., E. A. Pastukhov, and E. V. Ignat’eva. "On the “elasticity” of waves during vibrating action on a melt." Russian Metallurgy (Metally) 2015, no. 8 (August 2015): 603–5. http://dx.doi.org/10.1134/s0036029515080054.

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13

Nair, Sobha V., Zachariah Oommen, and Sabu Thomas. "Melt elasticity and flow activation energy of nylon 6/polystyrene blends." Materials Letters 57, no. 2 (December 2002): 475–80. http://dx.doi.org/10.1016/s0167-577x(02)00815-7.

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14

Ariffin, A., S. S. Jikan, M. S. F. Samsudin, Z. M. Ariff, and Z. A. M. Ishak. "Melt Elasticity Phenomenon of Multicomponent (Talc and Calcium Carbonate) Filled Polypropylene." Journal of Reinforced Plastics and Composites 25, no. 9 (June 2006): 913–23. http://dx.doi.org/10.1177/0731684406063550.

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15

Zhang, Si Deng, Xu Zhen Zhang, Bin Sun, Long Chen, Zhi Yan Ma, and Mei Fang Zhu. "Study on Preparation of Hard Elastic Polypropylene Fibers." Materials Science Forum 743-744 (January 2013): 414–19. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.414.

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Polypropylene pre-oriented multifilament were made by melt spinning with fast winding, and then hard elastic polypropylene fibers were made followed by annealing treatment under some conditions. The effects of the conditions of melt spinning and annealing process on the elasticity of polypropylene fibers were studied. The structure and property of hard elastic polypropylene fibers were analyzed by DSC,WAXD,SAXS and Sound velocity anisotropy. The results showed that the hard elasticity of annealed fibers increased with the improving of speed of winding, and the elasticity also increased with th

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16

Liu, Wei, Xunxian Zhu, Hongxiang Gao, Xiangdong Su, and Xian Wu. "Preparation and characterization of PLA foam chain extended through grafting octa(epoxycyclohexyl) POSS onto carbon nanotubes." Cellular Polymers 39, no. 3 (March 19, 2020): 117–38. http://dx.doi.org/10.1177/0262489320912521.

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Improving foamability of poly (lactic acid) (PLA) resin is a key issue for its critical foaming applications with high-performance and ultralow density. However, owing to the rheological nature of linear PLA chain structure with relatively low molecular weight, the overall foamability of PLA resin cannot meet the processing requirements of foaming purpose. Here, we describe a simple and versatile technique to prepare high foamability PLA resin by inducing chain extender through grafting octa(epoxycyclohexyl) polyhedral oligomeric silsesquioxanes (POSS) on carbon nanotubes (CNT). After the orde

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17

Ellul, M. D. "Novel Dynamically Vulcanized Elastomer-Polypropylene Blends with Improved Elasticity." Rubber Chemistry and Technology 76, no. 1 (March 1, 2003): 202–11. http://dx.doi.org/10.5254/1.3547734.

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Abstract High elasticity in dynamically vulcanized EPDM-Polypropylene blends, as demonstrated by lower residual deformation upon release of constraint, is a much desired attribute. It has been found that this property can be improved beyond the conventional norms of highly crosslinking the rubber phase. This is achieved through the use of a polypropylene phase with a high degree of long-chain branching. The branching index, g', at molecular weight greater than 1×106 should be less than about 0.6. It is postulated that in the melt and at low frequencies the long-chain branched polypropylene beh

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18

Plochocki, A. P., and L. Czarnecki. "Implications of the Melt Elasticity of Ldpe in the Film Blowing Process." Journal of Plastic Film & Sheeting 6, no. 2 (April 1990): 131–52. http://dx.doi.org/10.1177/875608799000600206.

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19

Koshy, Alex T., Baby Kuriakose, Sabu Thomas, C. K. Premalatha, and Siby Varghese. "Melt rheology and elasticity of natural rubber—ethylene–vinyl acetate copolymer blends." Journal of Applied Polymer Science 49, no. 5 (August 5, 1993): 901–12. http://dx.doi.org/10.1002/app.1993.070490516.

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20

Malfait, Wim J., and Carmen Sanchez-Valle. "Effect of water and network connectivity on glass elasticity and melt fragility." Chemical Geology 346 (May 2013): 72–80. http://dx.doi.org/10.1016/j.chemgeo.2012.04.034.

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21

Haenelt, Taida Gil, Prokopios Georgopanos, Clarissa Abetz, Sofia Rangou, Doreen Alisch, Andreas Meyer, Ulrich A. Handge, and Volker Abetz. "Morphology and elasticity of polystyrene-block-polyisoprene diblock copolymers in the melt." Korea-Australia Rheology Journal 26, no. 3 (August 2014): 263–75. http://dx.doi.org/10.1007/s13367-014-0031-3.

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22

Haworth, B., M. Gilbert, and D. J. B. MYERS. "Melt-state shear flow and elasticity of a thermoplastic fluorosulphonated—PTFE copolymer." Journal of Materials Science 40, no. 4 (February 2005): 955–64. http://dx.doi.org/10.1007/s10853-005-6514-3.

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23

Cohen-Addad, J. P. "NMR approach to melt properties: segmental motions, temporary elasticity and terminal relaxation." Journal of Non-Crystalline Solids 131-133 (June 1991): 693–96. http://dx.doi.org/10.1016/0022-3093(91)90669-w.

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24

Xu, Man, Zhicheng Jing, Suraj K. Bajgain, Mainak Mookherjee, James A. Van Orman, Tony Yu, and Yanbin Wang. "High-pressure elastic properties of dolomite melt supporting carbonate-induced melting in deep upper mantle." Proceedings of the National Academy of Sciences 117, no. 31 (July 20, 2020): 18285–91. http://dx.doi.org/10.1073/pnas.2004347117.

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Deeply subducted carbonates likely cause low-degree melting of the upper mantle and thus play an important role in the deep carbon cycle. However, direct seismic detection of carbonate-induced partial melts in the Earth’s interior is hindered by our poor knowledge on the elastic properties of carbonate melts. Here we report the first experimentally determined sound velocity and density data on dolomite melt up to 5.9 GPa and 2046 K by in-situ ultrasonic and sink-float techniques, respectively, as well as first-principles molecular dynamics simulations of dolomite melt up to 16 GPa and 3000 K.

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25

Abraham, Daniel, K. E. George, and D. J. Francis. "Melt Viscosity and Elasticity of Low Density and Linear Low Density Polyethylene Blends." International Journal of Polymeric Materials 18, no. 3-4 (November 1992): 197–211. http://dx.doi.org/10.1080/00914039208029321.

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26

Karaman, V. M., V. F. Shumsky, E. G. Privalko, V. P. Privalko, B. Lehmann, and K. Friedrich. "Melt Viscoelasticity of Polyamide 6/Organoclay Nanocomposites." Polymers and Polymer Composites 11, no. 8 (November 2003): 663–68. http://dx.doi.org/10.1177/096739110301100805.

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Commercial nanocomposites of polyamide 6, prepared by melt compounding with organoclay hybrids, were characterized by complex viscosities and relaxation time spectra derived from storage and loss shear moduli measured in the melt state at 230°C in the frequency window spanning about three decades. The results were rationalized in terms of the following model considerations. The decrease of ~25% (compared to the pristine sample) in Newtonian viscosity at the lowest clay loading (2.5%) suggested a lower equilibrium elasticity modulus of an entangled melt, as if the small amounts of organoclay na

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27

Atiqah, A. A. S. Maryam, Husseinsyah Salmah, Z. Firuz, and D. N. U. Lan. "Properties of Recycled High Density Polyethylene/Recycled Polypropylene Blends: Effect of Maleic Anhydride Polypropylene." Key Engineering Materials 594-595 (December 2013): 837–41. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.837.

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Polymer blending provides an efficient way to develop new materials with improved properties while preserve the primary properties of the materials at lower cost. The blends recycled high density polyethylene (rHDPE) and recycled polypropylene (rPP) with and without maleic anhydride polypropylene (MAPP) have been investigated. The effect of different blend ratios on tensile properties, morphology and melt flow index were studied. The tensile strength and modulus of elasticity of both blends increased with increased of rPP in the blend ratios but the elongation at break decreased. It was found

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28

Zhou, Yuxing, and Kenneth S. Schweizer. "Theory of microstructure-dependent glassy shear elasticity and dynamic localization in melt polymer nanocomposites." Journal of Chemical Physics 153, no. 11 (September 21, 2020): 114901. http://dx.doi.org/10.1063/5.0021954.

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29

Wakita, Naoki. "Melt elasticity of incompatible blends of poly(butylene terephthalate)(PBT) and polyamide 6 (PA6)." Polymer Engineering and Science 33, no. 13 (July 1993): 781–88. http://dx.doi.org/10.1002/pen.760331302.

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30

Jambon-Puillet, Etienne, Matthieu Royer Piéchaud, and P. T. Brun. "Elastic amplification of the Rayleigh–Taylor instability in solidifying melts." Proceedings of the National Academy of Sciences 118, no. 10 (February 22, 2021): e2020701118. http://dx.doi.org/10.1073/pnas.2020701118.

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The concomitant mechanical deformation and solidification of melts are relevant to a broad range of phenomena. Examples include the preparation of cotton candy, the atomization of metals, the manufacture of glass fibers, and the formation of elongated structures in volcanic eruptions known as Pele’s hair. Usually, solid-like deformations during solidification are neglected as the melt is much more malleable in its initial liquid-like form. Here we demonstrate how elastic deformations in the midst of solidification, i.e., while the melt responds as a very soft solid (G∼100 Pa), can lead to the

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31

Law, K. M., J. D. Blundy, B. J. Wood, and K. V. Ragnarsdottir. "Trace element partitioning between wollastonite and silicate-carbonate melt." Mineralogical Magazine 64, no. 4 (August 2000): 651–61. http://dx.doi.org/10.1180/002646100549670.

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AbstractWe have performed an experimental study of the influence of varying size and charge on cation partitioning between wollastonite and silicate-carbonate melt in the system CaCO3-SiO2. The experimental conditions (3 GPa, 1420°C) lie close to the wollastonite II tc/I tc phase boundary. Results for 1+, 2+, 3+ and 4+ partitioning show parabolic dependence of partition coefficients on ionic radius, which can be fitted to the elastic strain model of Blundy and Wood (1994), wherein partitioning is described using three parameters: site radius (r0), site elasticity (apparent Young's Modulus) and

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32

Panyukov, Sergey. "Theory of Flexible Polymer Networks: Elasticity and Heterogeneities." Polymers 12, no. 4 (April 1, 2020): 767. http://dx.doi.org/10.3390/polym12040767.

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A review of the main elasticity models of flexible polymer networks is presented. Classical models of phantom networks suggest that the networks have a tree-like structure. The conformations of their strands are described by the model of a combined chain, which consists of the network strand and two virtual chains attached to its ends. The distribution of lengths of virtual chains in real polydisperse networks is calculated using the results of the presented replica model of polymer networks. This model describes actual networks having strongly overlapping and interconnected loops of finite si

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33

Avella, Angelica, Rosica Mincheva, Jean-Marie Raquez та Giada Lo Re. "Substantial Effect of Water on Radical Melt Crosslinking and Rheological Properties of Poly(ε-Caprolactone)". Polymers 13, № 4 (4 лютого 2021): 491. http://dx.doi.org/10.3390/polym13040491.

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One-step reactive melt processing (REx) via radical reactions was evaluated with the aim of improving the rheological properties of poly(ε-caprolactone) (PCL). In particular, a water-assisted REx was designed under the hypothesis of increasing crosslinking efficiency with water as a low viscous medium in comparison with a slower PCL macroradicals diffusion in the melt state. To assess the effect of dry vs. water-assisted REx on PCL, its structural, thermo-mechanical and rheological properties were investigated. Water-assisted REx resulted in increased PCL gel fraction compared to dry REx (from

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34

Run, Ming Tao, Zi Yu Qi, Meng Yao, Wen Zhou, and Bing Tao Xing. "Phase Morphology and Rheology Behaviors of PTT/POE/OMMT Nanocomposites." Solid State Phenomena 181-182 (November 2011): 55–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.181-182.55.

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The phase morphology and dynamic rheology of poly (trimethylene terephthalate)/maleinized poly (octene-ethylene)/organo-montmorillonite nanocomposites were investigated by using transmission electron microscopy (TEM) and rotational rheometer. The results suggest that some of the OMMT are peeled off and the nanosheets are dispersed evenly in the polymer matrix. When the OMMT content is more than 4%, they are tended to form the aggregates in nanocomposites. The nanocomposites’ melt are pseudo-plastic fluid, and both complex viscosity and shear storage modulus increase with increasing OMMT conten

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35

Begieva, M. B., D. B. Amshokova, L. R. Pashtova, R. CH Bazheva та A. M. Kharaev. "Inﬂ uence of Na+-montmorillonite modiﬁ ed with acrylamide on the structure and properties of polypropylene". Plasticheskie massy, № 3-4 (31 травня 2020): 26–29. http://dx.doi.org/10.35164/0554-2901-2020-3-4-26-29.

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Sodium form montmorillonite was obtained from natural clay from the Gerpegezh deposit (Kabardino-Balkarian Republic, Russia). A procedure has been developed for modifying the sodium form of montmorillonite using acrylamide. The structure of the organoclay was conﬁ rmed by IR spectroscopy. Composites based on polypropylene and modiﬁ ed montmorillonite are obtained by melt mixing on a twin-screw extruder from JiangsuXindaScience & Technology. The structure of the obtained composites was investigated using X-ray diﬀ raction analysis and scanning electron microscopy. The results of testing the

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36

Chifor, Victoria, Radu Liviu Orban, Zafer Tekiner, and Mehmet Turker. "Mechanical, Thermal and Electrical Properties of Acrilonitril Butadiene Styrene (ABS) Composites Filled with Bronze Powder." Materials Science Forum 672 (January 2011): 179–82. http://dx.doi.org/10.4028/www.scientific.net/msf.672.179.

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This article reports on an experimental study of the mechanical, thermal and electrical properties of bronze-ABS composites containing 5, 10, 20, 30 vol.% of bronze powder. The mechanical properties such as ultimate tensile strength, elongation at fracture, modulus of elasticity, melt flow rate (MFR), hardness, thermal conductivity, electrical conductivity of bronze powder filler embedded in a ABS matrix were experimentally investigated. Thermal and electrical conductivity measurements were performed up to a filler concentration of 30 vol.%. The tensile strength, elongation, MFR values continu

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37

Arakawa, Keiichi, Tadashi Yokohara, and Masayuki Yamaguchi. "Enhancement of melt elasticity for poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by addition of weak gel." Journal of Applied Polymer Science 107, no. 2 (2007): 1320–24. http://dx.doi.org/10.1002/app.26631.

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38

Varughese, K. T., P. P. De, and S. K. Sanyal. "Melt elasticity behavior and extrudate characteristics of rigid poly(vinyl chloride)/epoxidized natural rubber miscible blends." Journal of Vinyl and Additive Technology 10, no. 4 (December 1988): 166–74. http://dx.doi.org/10.1002/vnl.730100403.

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39

Chen, Jun, Ting Chen, Xin Ping Liu, Li Ren Xiao, Qing Rong Qian, Jing Xu, Bao Quan Huang, and Qing Hua Chen. "Effect of Epoxy-Functionalized Acrylonitrile-Butadiene-Styrene on the Morphology and Rheological Properties of Poly(butylene terephthalate)/Poly(acrylonitrile-styrene-acrylate) Blends." Advanced Materials Research 893 (February 2014): 228–34. http://dx.doi.org/10.4028/www.scientific.net/amr.893.228.

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Glycidyl methacrylate (GMA) grafted acrylonitrile-butadiene-styrene (ABS) in the presence of styrene (St) monomer (AGS) was used as a compatibilizer in the immiscible poly(butylene terephthalate)/poly(acrylonitrile-styrene-acrylate) (PBT/ASA) blends. SEM analyses display a better dispersion of ASA particles in the PBT matrix with the content of AGS less than 4.0 wt% compared with the PBT/ASA blends. Rheological measurements show that the melt elasticity and melt strength of blends increase with increasing ABS-g-(GMA-co-St) content. The behavior of blends shifts from “liquid-like” to “solid-lik

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40

Peng, Qian, Zhou, Yang, Jin, and Li. "Influence of Incorporated Polydimethylsiloxane on Properties of PA66 Fiber and Its Fabric Performance." Polymers 11, no. 11 (October 23, 2019): 1735. http://dx.doi.org/10.3390/polym11111735.

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Poly(hexamethyllene adipamide), PA66 fiber has played an important role in varied industrial applications, and its corresponding product would become more competitive if some extra value was added to PA66 fiber. In this article, polydimethylsiloxane (PDMS) was used as an additive to prepare PA66/PDMS blend fibers through melt blend spinning carried out by a screw extruder spinning machine. When the amount of incorporated PDMS was 0.5–3 wt %, the blend melt demonstrated good spinning ability, and the PA66/PDMS blend fibers exhibited excellent mechanical property and reduced hot shrinkage. Moreo

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41

Sun, Dong, and Guang Li. "Study on Preparation of PA6 / PDMS Blended Fibers and Fabric Properties." Materials Science Forum 1003 (July 2020): 219–27. http://dx.doi.org/10.4028/www.scientific.net/msf.1003.219.

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PA6 fibers and fabric properties were studied by adding PDMS, and PA6 / PDMS blend fibers were prepared by melt spinning. The experiment found that the addition of PDMS can significantly promote the rheology of the PET / PDMS blend melt. DSC tests show that the addition of PDMS has basically no effect on its crystallization and melting characteristics. With the increase of PDMS content, the contact angle of water on the blended fabric surface increased. KES-FB was used to evaluate fabrics made from PA6 / PDMS blended fibers. It was found that with the increase of PDMS content, the softness and

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42

Li, Dong Fang, Li Li, and Jian Zhang Li. "Effects of VA Content and Melt Index of EVA on Mechanical Properties of Wood Plastic Composites." Advanced Materials Research 139-141 (October 2010): 129–32. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.129.

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Wood plastic composite (WPC) is very useful new material in the modern society. Improving the interfacial bond strength between wood and plastic is the foundation of improving the properties of WPC. Ethylene vinyl acetate (EVA) was used as the coupling agent of WPC in this study. Thermo-gravimetric analysis (TGA) was employed to study the thermal stability of wood flour modified by EVA. The modulus of rupture (MOR), the modulus of elasticity (MOE), and the tensile strength of WPC were investigated to understand the effects of the vinyl acetate (VA) content and the melt index of EVA on WPC. The

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43

Yang, Zhaoping, Chunling Xin, Waqas Mughal, Xiaogang Li, and Yadong He. "High-melt-elasticity poly(ethylene terephthalate) produced by reactive extrusion with a multi-functional epoxide for foaming." Journal of Applied Polymer Science 135, no. 8 (October 26, 2017): 45805. http://dx.doi.org/10.1002/app.45805.

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44

Sailer, C., and U. A. Handge. "Melt Viscosity, Elasticity, and Morphology of Reactively Compatibilized Polyamide 6/Styrene−Acrylonitrile Blends in Shear and Elongation." Macromolecules 40, no. 6 (March 2007): 2019–28. http://dx.doi.org/10.1021/ma062705c.

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45

Ali, Mohd Amran Bin Md, Shogo Nobukawa, and Masayuki Yamaguchi. "Morphology development of polytetrafluoroethylene in a polypropylene melt (IUPAC Technical Report)." Pure and Applied Chemistry 83, no. 10 (July 14, 2011): 1819–30. http://dx.doi.org/10.1351/pac-rep-11-01-10.

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Morphology development of polytetrafluoroethylene (PTFE) caused by applied flow history in molten isotactic polypropylene (PP) is investigated, employing a cone-and-plate rheometer and a capillary rheometer as mixing devices. Since the flow history is applied at 190 °C, PTFE is in the solid state whereas PP is in the molten state. It is found that primary PTFE particles tend to be agglomerated together by mechanical interlocking. Then they are fragmented into fibers by hydrodynamic force with reorganization process of crystalline phase. The diameter of the fragmented fibers is the same as that

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46

Резанова, Н. М., Ю. О. Будаш, M. О. Давиденко та А. В. Ковальчук. "Вплив добавок нанорозмірного оксиду алюмінію на структуру та реологічні властивості суміші поліпропілен/співполіамід". Bulletin of the Kyiv National University of Technologies and Design. Technical Science Series 138, № 5 (3 лютого 2020): 107–14. http://dx.doi.org/10.30857/1813-6796.2019.5.12.

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Investigation of the effect of the concentration of aluminum oxide nanoparticles on the micro- and macro-rheological properties of the melt of a polypropylene / copolyamide (PP / CPA) mixture to control the morphology of nanofilled composites. The starting polymers and nano-additive were melt blended on a worm-disk extruder. The degree of dispersion of the component of the dispersed phase in the matrix was evaluated by micrographs of cross sections of the extrudates of the mixtures. The types of PP structures and their dimensional characteristics were studied using an optical microscope. The e

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47

Rezanova, Natalia, Yurii Budash, Viktoriia Plavan, Olena Ishchenko, and Viktoriia Bulakh. "Morphology and Rheology of Nanofilled PP / PVA Blends." Materiale Plastice 54, no. 4 (December 30, 2017): 735–39. http://dx.doi.org/10.37358/mp.17.4.4934.

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The influence of Ag/SiO2 as nanofiller and sodium oleate as compatibilizer and their mixtures on the patterns flow and structure formation processes in thermodynamically incompatible polypropylene/plasticized polyvinylalcohol (PP / PVA) systems were studied. It is found that the change in the sequence of mixing the ingredients of the composition allows adjusting the morphology phase type due to the predominant localization of nanoparticle additives in the melt amount of a component or on the border of phase separation. Injection of Ag/SiO2 to melt PP increases dispersion degree and homogeneity

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48

Kwon, Youngdon. "Numerical modelling of two-dimensional melt fracture instability in viscoelastic flow." Journal of Fluid Mechanics 855 (September 19, 2018): 595–615. http://dx.doi.org/10.1017/jfm.2018.659.

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Computationally modelling the two-dimensional (2-D) Poiseuille flow along and outside a straight channel with a differential viscoelastic constitutive equation, we demonstrate unstable dynamics involving bifurcations from steady flow to periodic melt fracture (sharkskin instability) and its further transition regime to a chaotic state. The numerical simulation first exposes transition from steady flow to a weak instability of periodic fluctuation, and in the middle of this periodic limit cycle (in the course of increasing flow intensity) a unique bifurcation into the second steady state is man

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49

Lam, Yee Cheong. "Flows in Microchannels and Cavities – Visco-Elasticity, Faradaic Charging and Surface Roughness Effects." Advanced Materials Research 74 (June 2009): 73–76. http://dx.doi.org/10.4028/www.scientific.net/amr.74.73.

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Two phenomena for flows in microchannels, namely visco-elastic instability and Faradaic charging effects, are discussed. Aqueous solutions, which do not exhibit elastic behaviors, will behave visco-elastically with the addition of a small amount of polymers. Visco-elastic flow instability which promote mixing has been observed in the flow of these visco-elastic solutions through a constriction in microchannels. In addition, we recently show experimentally the existance of Faradaic charging in AC-electrokinetic (ACEK) flow. Lastly, surface roughness effects in micro- plastic injection molding a

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50

Dealy, John M. "Rheology of Molten Polymers." MRS Bulletin 16, no. 8 (August 1991): 24–26. http://dx.doi.org/10.1557/s0883769400056281.

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The term “polymeric liquids” is used to describe both solutions of polymers and molten polymers. All polymeric liquids exhibit non-Newtonian flow behavior, including a shear stress-dependent viscosity and elasticity. However, concentrated solutions and melts of polymers whose molecular weights exceed a certain critical value (the “critical molecular weight for entanglement,” Mc) exhibit quite remarkable deviations from classical fluid behavior, especially marked elasticity. Among the remarkable rheological phenomena exhibited by these materials are elastic recoil and flow-induced an-isotropy.

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