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Polymer blend

About: Polymer blend is a research topic. Over the lifetime, 18474 publications have been published within this topic receiving 437183 citations. The topic is also known as: polymer mixture & Polymerblend 或者 Polyblend.


Papers
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Journal ArticleDOI
TL;DR: Using both equilibrium and nonequilibrium molecular dynamics simulations, the structure, dynamics, and rheology of perfectly controlled ring-linear polymer blends of chains of up to about 14 entanglements per chain are investigated, comparable to experimental systems.
Abstract: Ring polymers remain a challenge to our understanding of polymer dynamics. Experiments are difficult to interpret because of the uncertainty in the purity and dispersity of the sample. Using both equilibrium and nonequilibrium molecular dynamics simulations we have investigated the structure, dynamics, and rheology of perfectly controlled ring-linear polymer blends of chains of up to about 14 entanglements per chain, comparable to experimental systems. Linear contaminants increase the zero-shear viscosity of a ring polymer melt by about 10% around one-fifth of their overlap concentration. For equal concentrations of linear and ring polymers, the blend viscosity is about twice that of the pure linear melt. The diffusion coefficient of the rings decreases dramatically, while the linear polymers are mostly unaffected. Our results are supported by a primitive path analysis.

180 citations

Journal ArticleDOI
TL;DR: In this article, a high-throughput measurement of cloud points for polymer blends utilizing a novel sample deposition method for creating two-dimensional composition (φ), temperature (T) libraries is presented.
Abstract: Introduction. Because of successes in pharmaceuticals research, combinatorial and high-throughput methods for searching composition space1-3 have received increasing attention for the synthesis and discovery of new inorganic materials,4-6 catalysts,7,8 and organic polymers.9,10 Combinatorial methods can also allow rapid scanning of parameter space to make fundamental measurements and develop physical models for polymers. One limitation is the difficulty of preparing parallel libraries and performing highthroughput screening with conventional instrumentation and sample preparation. Recently, we developed a combinatorial technique for investigating polymer thin film dewetting phenomena by using sample libraries with orthogonal gradients in thickness and temperature to create a large database of dewetting information in a few hours of experiments.3,11 This report describes high-throughput measurement of cloud points for polymer blends utilizing a novel sample deposition method for creating two-dimensional composition (φ), temperature (T) libraries. In the sample libraries, T and φ are varied orthogonally, and optical microscopy is used to detect phase separation and microstructure. The cloud points determined with this high-throughput method are validated by comparison to conventional light scattering results and singlecomposition controls. Library Preparation. Three steps are involved in preparing composition gradient films: gradient mixing (Figure 1a), deposition (Figure 1b), and film spreading (Figure 1c). Two syringe pumps (Harvard PHD2000)12 (Figure 1a) introduce and withdraw polymer solutions to and from a mixing vial at rates I and W, respectively, where I ) W ) 1.7 mL/min. Pump I contained mass fraction xPS,O ) 0.080 of polystyrene (PS, Mr ) 96.4 kg/ mol, Mr/Mn ) 1.01, Tosoh)13 in toluene. The vial was loaded with an initial M0 ) 2.0 mL of mass fraction xPVME,O ) 0.080 of poly(vinyl methyl ether) (PVME, Mr ) 119 kg/mol, Mr/Mn ) 2.5)14 in toluene from pump W. The infusion and withdrawal syringe pumps were started simultaneously while vigorously stirring the vial solution, and a third syringe, S, was used to manually extract solution from the vial. A mass balance of the transient mixing process gives the mass fraction of PS, xPS, in the vial at any time t (minutes) as

179 citations

Patent
05 May 1977
TL;DR: In this paper, a multicomponent polymer blend composition is prepared by intimately mixing a thermoplastic polyester, a selectively hydrogenated monoalkenyl arene-diene block copolymer, and at least one dissimilar engineering thermoplastics under such conditions that at least two of the polymers form at least partial continuous network phases which interlock with the other polymer networks and therefore results in a desirable balance of properties.
Abstract: A multicomponent polymer blend composition is prepared by intimately mixing a thermoplastic polyester, a selectively hydrogenated monoalkenyl arene-diene block copolymer, and at least one dissimilar engineering thermoplastic resin under such conditions that at least two of the polymers form at least partial continuous network phases which interlock with the other polymer networks and therefore results in a desirable balance of properties. These blends have an unobviously high heat distortion temperature relative to the improved impact strength.

179 citations

Journal ArticleDOI
TL;DR: Melange de PEO avec PMMA protone ou deuterie as mentioned in this paper : PMMA est incorpore dans la phase amorphe entre les lamelles cristallines
Abstract: Melange de PEO avec PMMA protone ou deuterie. PMMA est incorpore dans la phase amorphe entre les lamelles cristallines

179 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202383
2022167
2021411
2020451
2019427
2018439