ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Brittle thermoplastics are hardened and embrittled by mineral fillers and softened and (sometimes) toughnened by elastomers. We investigated the possibility of combining these effects favorably in filled blends of a thermoplastic, polystyrene (PS); an elastomer, poly-butadiene (BR); and a filler, chalk. The success had to be measured in comparison to commercial high-impact polystyrene (HIPS) which is produced by in situ polymerization. At low concentrations of BR, simple blends of PS/BR are tougher than PS itself, but not considerably. This could be improved by adding chalk. The blends PS/BR/chalk feature a core-shell domain morphology, with BR enveloping chalk aggregates on the micrometer scale. At BR contents of less than 10 Vol %, the stress-strain behavior of the filled blends PS/BR/chalk compares well to that of HIPS. The blends exhibit multicrazing with char-acteristic patterns and can be easily without breaking. At higher BR contents, however, the blends go back to brittle failure. © 1996 John Wiley & Sons, Inc.
Additional Material:
18 Ill.
Type of Medium:
Electronic Resource
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