Structure-Property Relationship in Rubber-Modified Propylene-Ethylene Block Copolymer Blends

Sain, Mohini; Hudeč, Ivan; Beniska, J.; Rösner, Peter

doi:10.5254/1.3536216

Cited by 11 publications

(5 citation statements)

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“…Static vulcanization, used commercially since the days of Charles Goodyear [8], involves the heating of a rubber stock (fully compounded and mixed with a cure system, usually sulfur) at a temperature of 130-180 C for a specified time, during which chemical crosslinks are formed between the macromolecules of the elastomer (e.g., natural rubber, butyl, EPDM, etc.) [9,10]. This process transforms the rubber into a tough, elastic, durable thermoset material [11].…”

Section: Introductionmentioning

confidence: 99%

Foamability of Thermoplastic Vulcanizates Blown with Various Physical Blowing Agents

Kim

Park

Sain

2008

Journal of Cellular Plastics

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Thermoplastic vulcanizate (TPV) is a special class of thermoplastic elastomers (TPEs) made of a rubber/plastic polymer mixture in which the rubber phase is highly vulcanized. It is prepared by melt mixing a thermoplastic with an elastomer and by in situ crosslinking of the rubber phase. Currently, TPV is replacing EPDM rubber dramatically because of the impressive advantages for automotive sealing applications. Some of the advantages of TPV compared to that of EPDM rubber are good gloss, recyclability, improved colorability, shorter cycle time, and design flexibility. The development of TPV foaming technology is to fulfill the requirement of achieving lower cost, lighter weight, and better fuel economy. Foaming of TPV has not been investigated extensively. The complete dissolution of the blowing agent in the molten polymer is the most critical step in TPV foaming processing, and this strongly depends on the solubility of the blowing agent, the saturation pressure, the degree of mixing, and residence time. In our study, we attempted to understand the foaming behavior of commercial TPVs in general, with various blowing agents. The effect of blowing agent type and concentration on the expansion behavior, the cell-number density, and the foam structure under the different processing conditions are examined. These experimental results will be used to determine optimized TPV formulations to ensure good foamability, while retaining the properties of TPV.

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Section: Introductionmentioning

confidence: 99%

Foamability of Thermoplastic Vulcanizates Blown with Various Physical Blowing Agents

Kim

Park

Sain

2008

Journal of Cellular Plastics

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“…These results again show that a diblock copolymer (i.e., compatibilizer C) is more efficient than either a triblock or graft copolymer 3, 4, 13–15. Compatibilizer A is better than compatibilizer B because the reactive maleic anhydride group is an effective modifier for blends prepared from mixtures of polar and nonpolar polymer components 16–19. Because compatibilizer A is a triblock copolymer and the maleic anhydride group is actually grafted onto PS, it is not as effective as compatibilizer C.…”

Section: Resultsmentioning

confidence: 89%

Rheological and mechanical properties of compatibilized polystyrene/ethylene vinyl acetate blends

Tang

Tam

Yue

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:In this study, a blend of polystyrene (PS)/ ethylene vinyl acetate (EVA) (PS/EVA, 90 : 10 wt %) was compatibilized with three different block copolymers, in which their end blocks were compatible with either styrene or EVA. The compatibilized blends with different compositions were prepared using a twin-screw extruder and injection molded into the required test specimens. Mechanical properties of the blends, such as tensile properties and Charpy impact strength, morphology of tensile fractured surfaces, rheological properties, and thermal properties, were investigated. The results show that the interaction between the dispersed and continuous phase can be improved by the addition of a compatibilizer. Appreciable improvement in the impact strength of the blend with 15 wt % of compatibilizer C (polystyrene-block-polybutadiene) was observed. Its mechanical properties are comparable to those of the commercial high-impact polystyrene, STYRON 470.

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“…The saturated TPE, which is actually a block copolymer of styrene-butylene and styrene, has Tg values similar to those cited for SBS. As shown in Figure 2, the optimum service temperature for TPE's is between the Tg values for the soft and hard domains (10,11).…”

Section: [_(_ch2-ch(c0h5)"(-[ch2ch=chch2]-)n(-ch2-ch(c6h5)n-]mentioning

confidence: 99%

Elastomers: III. Thermoplastic elastomers

Seymour¹,

Kauffman²

1992

J. Chem. Educ.

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Structure-Property Relationship in Rubber-Modified Propylene-Ethylene Block Copolymer Blends

Cited by 11 publications

References 0 publications

Foamability of Thermoplastic Vulcanizates Blown with Various Physical Blowing Agents

Foamability of Thermoplastic Vulcanizates Blown with Various Physical Blowing Agents

Rheological and mechanical properties of compatibilized polystyrene/ethylene vinyl acetate blends

Elastomers: III. Thermoplastic elastomers

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