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Interaction of polymerization conditions, structural variables, and mechanical properties of rubber‐modified plastics produced from bulk polymerized styrene/poly(butadiene‐co‐styrene)
Author(s) -
Mui Ernie Tak Cheung,
Boateng Victor Berko,
Fellers John F.,
White James L.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270428
Subject(s) - natural rubber , materials science , polymerization , ultimate tensile strength , izod impact strength test , copolymer , styrene butadiene , composite material , styrene , polymer , polymer chemistry , grafting
Rubber‐modified polystyrenes were prepared by bulk polymerization with seven different butadiene–styrene copolymers of differing chemical microstructures. The products were structurally characterized through measurement of the swell ratio, percent insolubles, intrinsic viscosity of the soluble fraction, and transmission electron microscope photomicrographs. Increasing initiator concentration or raising polymerization temperature gives lower molecular weight, higher rubber crosslink density, and decreased grafting. Increasing rubber content generally leads to aggregation. Tensile stress–strain curves and Izod impact strengths were measured. High Izod impact strength and increased elongation to break are favored by increasing matrix molecular weight, rubber content, and extent of grafting.