Academic literature on the topic '2-polybutadiene'

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Journal articles on the topic "2-polybutadiene"

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Roovers, Jacques, and Paul M. Toporowski. "Characteristic Ratio and Plateau Modulus of 1,2-Polybutadiene. A Comparison with Other Rubbers." Rubber Chemistry and Technology 63, no. 5 (1990): 734–46. http://dx.doi.org/10.5254/1.3538286.

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Abstract In the course of work on linear and ring polybutadienes with 62% 1,2 units, a number of discrepancies were noted with data on polybutadienes of various microstructure available in the literature. For example, GNο=870 kPa for our 62% 1,2-polybutadiene. This is larger than GNο=730 kPa for a 56% 1,2-polybutadiene and GNο=550 kPa for a 78% 1,2-polybutadiene sample. The cis : trans ratio of our 62% 1,2-polybutadiene, prepared with potassium counterion, is 1 : 4, On the other hand, the cis : trans ratio of 62% 1,2-polybutadiene prepared with a modified Li catalyst is estimated to be 1 : 2.
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Pleska, Alexander, Iva Klichová, and Jindřich Pytela. "Grafting of Hydroxy-Terminated Polybutadiene with 2-Mercaptoethanol." Collection of Czechoslovak Chemical Communications 67, no. 12 (2002): 1899–910. http://dx.doi.org/10.1135/cccc20021899.

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A method for functionalization of hydroxy-terminated polybutadiene with 2-sulfanylethan-1-ol (2-mercaptoethanol) leading to a controlled increase in the OH functionality of the polymer was developed. The polybutadiene used contained about 65% of unsaturation in the form of 1,2-vinyl groups. The reaction was carried out without using volatile solvents. The radical addition of 2-sulfanylethan-1-ol on the polymer proceeded quantitatively and the products were free of the mercaptan odour. A series of functionalized polybutadienes were synthesized and characterized by their physical and chemical pr
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Zhang, Ming, Zhi Xiong Huang, and Min Xian Shi. "Quantum Chemistry Theoretical Studies on Molecular Structures of Polybutadiene." Advanced Materials Research 87-88 (December 2009): 130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.130.

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The Density Function Theory (DFT) method are employed to study the geometries of the polybutadiene (C4H6)n(n=3,4,5)on the base of B3LYP/6-311+G in the paper. the polybutadiene have five isomers, including Cis-1,4-polybutadiene, Trans-1, 4-polybutadiene, Isotactic1, 2-polybutadiene, Syndiotactic1,2-polybutadiene, Atactic1, 2-polybutadiene. The molecular structures of each isomer were evaluated on the basis of single point energy with zero point vibration correction. The results show that the energies of polybutadiene varied with increase of molecular weight.
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Wang, Beibei, Heng Liu, Tao Tang та Xuequan Zhang. "cis-1,4 Selective Coordination Polymerization of 1,3-Butadiene and Copolymerization with Polar 2-(4-Methoxyphenyl)-1,3-butadiene by Acenaphthene-Based α-Diimine Cobalt Complexes Featuring Intra-Ligand π-π Stacking Interactions". Polymers 13, № 19 (2021): 3329. http://dx.doi.org/10.3390/polym13193329.

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Highly cis-1,4 selective (up to 98%) coordination–insertion polymerization of 1,3-butadiene (BD) has been achieved herein using acenaphthene-based α-diimine cobalt complexes. Due to the presence of intra-ligand π-π stacking interactions, the complexes revealed high thermostability, affording polybutadiene products in high yields. Moreover, all of the obtained polymers possessed a relatively narrow molecular weight distribution as well as high molecular weight (up to 92.2 × 104 Dalton). The molecular weights of the resultant polybutadienes could be finely tuned by varying polymerization paramet
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Antipov, Evgueni M., Evguenia A. Mushina, Manfred Stamm, and Erhard W. Fischer. "Structure of Polybutadienes Synthesized with a New Catalyst System, 2. Blends oftrans-andcis-1,4-Polybutadiene." Macromolecular Chemistry and Physics 202, no. 1 (2001): 73–81. http://dx.doi.org/10.1002/1521-3935(20010101)202:1<73::aid-macp73>3.0.co;2-3.

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Coquillat, M., J. Verdu, X. Colin, L. Audouin, and R. Nevière. "Thermal oxidation of polybutadiene. Part 2: Mechanistic and kinetic schemes for additive-free non-crosslinked polybutadiene." Polymer Degradation and Stability 92, no. 7 (2007): 1334–42. http://dx.doi.org/10.1016/j.polymdegradstab.2007.03.019.

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Mohamed Iyad Al, Naboulsi, Niculae Napoleon Antonescu, Alin Dinita, and Marius Morosanu. "Tribological Characterization of Some Elastomers Used at Progressive Cavity and Piston Pumps." MATEC Web of Conferences 318 (2020): 01016. http://dx.doi.org/10.1051/matecconf/202031801016.

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The progressive cavity pump (PCP) is a positive displacement pump, consisting of a polished helical-shaped rod (rotor) turning inside a helical elastomer (stator). PCP has many advantages, but the pump durability is manly limited by elastomer behavior. At piston pumps (PP) used for drilling mud piston has an elastomer sleeve that also limit the durability. Standards like ISO 15136.1 &amp; 2 for pumps developed by manufactures and users’ committees provides requirements for design, quality design verification etc., but do not define specifically the elastomer for the stator or the metal used fo
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Babutan, Iulia, Leonard Ionut Atanase, and Ioan Botiz. "Self-Assembly of Lamellar/Micellar Block Copolymers Induced Through Their Rich Exposure to Various Solvent Vapors: An AFM Study." Materials 18, no. 8 (2025): 1759. https://doi.org/10.3390/ma18081759.

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In this work, we have employed an advanced method of solvent vapor annealing to expose spin-cast thin films made from various lamellar and micellar block copolymers to generous amounts of different types of solvent vapors, with the final goal of stimulating the films’ self-assembly into (hierarchically) ordered structures. As revealed by atomic force microscopy measurements, periodic lamellar nanostructures of molecular dimensions based on poly(4-vinylpyridine)-b-polybutadiene and poly(2-vinylpyridine)-b-polybutadiene, as well as micellar structures further packed into either (parallel) stripe
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Rozentsvet, V. A., D. M. Ulyanova, N. A. Sablina, R. V. Brunilin, and P. M. Tolstoy. "Synthesis of Low Molecular Weight Butadiene Polymers Using Cationic Catalytic Systems Based on Diethylaluminium Chloride." Кинетика и катализ 64, no. 1 (2023): 65–77. http://dx.doi.org/10.31857/s0453881123010069.

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Сationic polymerization of butadiene with the catalytic systems based on diethylaluminium chloride (AlEt2Cl) in combination with tertiary alkyl halides (AH), such as tert-butyl chloride, tert-butyl bromide and 2-chloro-2-methylbutane, is an effective method for obtaining fully soluble butadiene polymers at a industrially relevant temperature of 20°C. It is shown that, regardless of the nature of AH in the catalytic system, with an increase in the duration of the polymerization process of butadiene, the values of the weight-average molecular weight and polydispersity of the polymers significant
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Serrano, Myrna, William J. MacKnight, Edwin L. Thomas, and Julio M. Ottino. "Transport-morphology relationships in segmented polybutadiene polyurethanes: 2. Analysis." Polymer 28, no. 10 (1987): 1674–79. http://dx.doi.org/10.1016/0032-3861(87)90010-3.

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Dissertations / Theses on the topic "2-polybutadiene"

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Horng, Jiang huang, and 洪健晃. "Application of Ru[bpy(CH2Cl)2]3(PF6)2 coupling agent on synthesis of star-shaped polybutadiene." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/24061430617402068517.

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碩士<br>國立中正大學<br>化學工程研究所<br>88<br>This report describes the use of Ru reagent with six chloromethyl functionalities, Ru[bpy(CH2Cl)2]3(PF6)2, as a multifunctional metal com-plex coupling agent for the anionic synthesis of star shaped polybutadiene. Living polybutadiene arms with narrow molecular weight distribution were prepared by anionic polymerization, followed by the addition of Ru complex coupling agent. Coupling efficiency and the number of arms on the resulting star polybutadiene were determined by GPC using poly-styrene standard and MWs were measured by the multiple-angle lase
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Book chapters on the topic "2-polybutadiene"

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Li, Lingyun, Wenxuan Zhu, Jingen Zhang, and Xiangming Xu. "Graft Copolymerization of Styrene-Maleic Anhydride and CIS-Polybutadiene." In Integration of Fundamental Polymer Science and Technology—2. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1361-5_8.

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"Cobalt Alkylxhanthogenate+Trialkylaluminum Catalytic Dithiosystems for Synthesis of Syndiotactic 1, 2-Polybutadiene ........ Nazil Fazil oglu Janibayov." In Chemical and Structure Modification of Polymers. Apple Academic Press, 2016. http://dx.doi.org/10.1201/b19300-33.

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Guo, Xiangyao, and G. L. Rempel. "Hydrogenation of Cis-1,4-Polybutadiene and Nitrile-Butadiene Copolymers Using Rucl(co)(ocoph)(Pph3)2 as Catalyst." In Progress in Catalysis, Proceedings of the 12th Canadian Symposium on Catalysis. Elsevier, 1992. http://dx.doi.org/10.1016/s0167-2991(08)60806-x.

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"Hyperbranched 1, 4-Cis+1, 2-Polybutadiene Synthesis Using Novel Catalytic Dithiosystems .................................................... and Nazil Fazil oglu Janibayov." In Chemical and Structure Modification of Polymers. Apple Academic Press, 2016. http://dx.doi.org/10.1201/b19300-32.

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"9. Polybutadiene polyols." In [Set Polyols for Polyurethanes, Volume 1+2]. De Gruyter, 2019. http://dx.doi.org/10.1515/9783110644104-009.

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Abdullin, M., A. Glazyrin, O. Kukovinets, A. Basyrov, and G. Zaikov. "Chemical Modification of Syndiotactic 1,2-Polybutadiene." In The Chemistry and Physics of Engineering Materials, Volume One. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b18708-2.

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Clarson, Stephen J. "Cyclic Poly(dimethylsiloxane)." In Polymer Data Handbook. Oxford University PressNew York, NY, 2009. http://dx.doi.org/10.1093/oso/9780195181012.003.0019.

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Abstract Cyclic poly(dimethylsiloxanes) and their Properties Polymer molecules may have a variety of architectural structures such as linear, ring, star, branched and ladder chains, and also three-dimensional network structures. The first synthetic cyclic polymers to be prepared and characterized were the poly(dimethysiloxanes) PDMS which were reported in 1977. Since then, a number of other cyclic polymers have been synthesized which include cyclic polystyrene, cyclic poly(phenylmethylsiloxane), cyclic poly(2-vinylpyridine), cyclic polybutadiene, and cyclic poly(vinylmethylsiloxane). The prepa
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Conference papers on the topic "2-polybutadiene"

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Marinack, Martin C., Brian G. Gaudio, Richard E. Musgrave, Christopher E. Rizzo, Michael Lovell, and C. Fred Higgs. "Coefficient of Restitution Testing: Explicit Finite Element Modeling and Experiments." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41254.

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Particle based modeling approaches, such as the discrete element method (DEM) approach, require the definition of accurate contact (collision) models. An essential parameter within these models is the coefficient of restitution (e), which defines the ratio of post-collision to pre-collision relative velocity during the collision of two materials. In this study, e of various steel-material combinations is predicted through both physical experiments and explicit finite element modeling of a falling sphere colliding with a stationary plate, and examined against a theoretical formulation of e. Exp
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Koshino, Tetsushi, Mohamed S. Aly-Hassan, and Hiroyuki Hamada. "Jute Fiber Reinforced Polymeric Composites With Flexible Interphase." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87775.

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In this research, the flexible interphase concept was introduced to enhance the poor mechanical properties of jute fiber reinforced unsaturated polyester matrix composites. The jute cloth reinforcement was obtained from recycled coffee bags. These jute cloths after washing by water and drying were soaked in mixture of Polybutadiene Epoxydied as flexible resin and acetone for 10 seconds. Several mixtures consist of 0, 2, 3.5, 5 and 8 wt% of Polybutadiene Epoxydied and 100, 98, 96.5, 95 and 92 wt% of acetone, respectively, to form flexible interface around the jute fibers. Jute cloth reinforced
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Santos, Genivaldo P., Pedro T. Lacava, Susane R. Gomes, and José Atíllio F. F. Rocco. "Kinetics Parameters Evaluation of Paraffin-Based Fuel." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86275.

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In recent years, Hybrid Propulsion is turning into a significant alternative to Liquid and Solid Propulsion Systems, it presents attractive features and good balance between performance and environmental impact. Thus, paraffin based propellant grains are indicated as a substitute for hydroxyl-terminated polybutadiene (HTPB), the actual solid propellant fuel grain. Despite being a well-known material, scarce data on the relation of activation energy (Ea) and molecular weight (WCxHy) of paraffin is available. In this work, the kinetic parameters (activation energy and pre-exponential factor) of
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