Morphologie von kautschukmodifiziertem Polystyrol auf basis von Styrol‐Butadien‐Dreiblockcopolymeren

Echte, Adolf; Gausepohl, Hermann; Lütje, Hans

doi:10.1002/apmc.1980.050900109

Cited by 15 publications

(5 citation statements)

References 19 publications

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“…These changes in rubber‐phase morphology indirectly support the presence of a relatively high graft level at the interface between the PS and PB phases when BPO was used. The analogous pattern changes of rubber particle morphology with respect to the amount of block ‐styrene in styrene–butadiene copolymers can be found elsewhere 20, 21. Direct measurements of the degree of grafting were tried after centrifugation of the samples dispersed in toluene, but quantitative analysis was not possible because the rubber gels that separated still contained PS occlusions.…”

Section: Resultsmentioning

confidence: 87%

Influence of solvent contents on the rubber‐phase particle size distribution of high‐impact polystyrene

Lee

Jeoung

Ahn

2003

J of Applied Polymer Sci

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High-impact polystyrene (HIPS) was prepared by the bulk or low-solvent polymerization of styrene in the presence of dissolved rubber and characterized to measure the dispersed particle size of the rubber phase. Before preparation, the prepolymerization time was established by measuring the evolution of particle size distribution of the dispersed phase as a function of reaction time. The measurement technique by laser light scattering was found to be efficient enough not only to lead to the right prepolymerization time but also to predict rubber-phase particle size distribution. Polymerization experiments were then conducted to investigate the effect of solvent contents on the particle size distribution of the rubber phase, in which ethylbenzene was introduced as a solvent at levels of 0, 3, 10, and 15%. As the solvent content increased, the size of rubber-phase particles initially increased, reaching a maximum, and then decreased. It is speculated that a decrease in the molecular weight of the matrix, a decrease in the viscosity ratio between polybutadiene to polystyrene phases, and a change in rubber morphology all contributed to the change in the rubber particle size of HIPS.

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Section: Resultsmentioning

confidence: 87%

Influence of solvent contents on the rubber‐phase particle size distribution of high‐impact polystyrene

Lee

Jeoung

Ahn

2003

J of Applied Polymer Sci

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“…Block copolymers induce a change in the internal structure of the particles. Polymerization of styr ene in the presence of preformed styrene-butadiene di-, tri-, or multiblock copolymers produces different particle structures [195][196][197]. These structural changes map the structure of the styrene-butadiene block polymer, which exhibit domain arrays depending on their composition.…”

Section: Blends Of Polystyrene and Styrene Copolymersmentioning

confidence: 99%

Rubber–Plastic Blends: Structure–Property Relationship

Datta

2016

Encyclopedia of Polymer Blends

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Blends of rubbers and plastics have both an extensive history and a variety of applications, since blends retain most of the stiffness of thermoplastics and impart some of the resilience and the impact toughness of rubbers. Most useful blends have morphology of rubber dispersed in the thermoplastic matrix since the reverse does not lead to same degree of utility. The properties of these blends depend on the relative ratio of the rubber and the plastic and, more importantly, on the morphology of the dispersion. A very large research effort has been made in an attempt to control and determine the morphology and the interface of the rubber and the plastic as well as understand the effect of the rubber dispersion on the properties of the blend. Blends are important commercially since they allow the development of unique properties from the same constituents with small changes in the relative amounts or the dispersion. The conventional prac tice of blend formation is the melt mixing of the components although, in some cases, a polymerization process that enables the direct production of the binary blend is possible. These direct production processes are efficient since they pro duce the desired morphology and the required polymers in a single step. Blends have become extremely important for the development of polyolefin rubbers and plastics since a large variety can be mixed in a wide composition ratio to produce novel properties. These blends are easily made and have stable dispersion during processing due to only small thermodynamic differences between the various polyolefins compared with engineering thermoplastics. This chapter describes the physics and the chemistry and more importantly the relationship between the structure of the blend and its properties. This area has been continually progressed [1] and reviewed [2]. Progress arises from new materials and new technologies for making rubber-plastic blends. The area of polyethylene blends cited above is an important development. The Encyclopedia of Polymer Blends: Volume 3: Structure, First Edition. Edited by Avraam I. Isayev.

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“…High impact polystyrene (HIPS) resin is an important elastomer‐toughened thermoplastic that provides an excellent balance between rigidity and elasticity, which is superior to general purpose polystyrene (PS) . In the bulk HIPS process, the radical polymerization of styrene (St) is carried out in the presence of dissolved polybutadiene (PB), resulting in PB rubber matrix grafted with PS sequences to provide high impact toughness.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mechanical properties of high impact polystyrene with in situ bulk polymerization toughened by one‐pot Nd‐based styrene–isoprene–butadiene terpolymer rubber

et al. 2016

J of Applied Polymer Sci

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High impact polystyrene (HIPS) resins were obtained with in situ bulk polymerization toughened by styrene-isoprenebutadiene terpolymer rubber (SIBR). SIBR prepolymer was prepared through selective polymerization of styrene (St), isoprene (Ip), and butadiene (Bd) in St with [Nd]/[Al]/[Cl] catalyst. Nd-based catalyst exhibited more favorable activity toward conjugated diene other than St, resulting in St solution of random SIBR with high cis-1,4 stereoregularity and low St content, which was directly exposed to the free radical polymerization of St to generate HIPS. Effect of toughened rubber and the initiators [difunctional (D2) and trifunctional (T3)] were examined to attain HIPS possessing mechanical properties as follow: impact strength, 0.9-24.8 kJ/m 2 ; tensile strength, 16.0-27.5 MPa; and elongation at break, 7.4-107.0%. Increasing SIBR matrix in HIPS improved the impact strength and decreased tensile strength. The fracture surface morphologies of HIPS specimens were studied by notched impact tests and scanning electron microscopy (SEM), illustrating that the incremental SIBR matrix presented synergistic toughening effect of crazing to enhance the ductile fracture behavior.

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Morphologie von kautschukmodifiziertem Polystyrol auf basis von Styrol‐Butadien‐Dreiblockcopolymeren

Cited by 15 publications

References 19 publications

Influence of solvent contents on the rubber‐phase particle size distribution of high‐impact polystyrene

Influence of solvent contents on the rubber‐phase particle size distribution of high‐impact polystyrene

Rubber–Plastic Blends: Structure–Property Relationship

Synthesis and mechanical properties of high impact polystyrene with in situ bulk polymerization toughened by one‐pot Nd‐based styrene–isoprene–butadiene terpolymer rubber

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