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Polyblends of poly(vinyl chloride) with ethylene/vinyl acetate copolymers: Practical properties and morphology
Author(s) -
Deanin Rudolph D.,
Shah Nikhil A.
Publication year - 1983
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730050404
Subject(s) - copolymer , materials science , vinyl chloride , vinyl acetate , ethylene vinyl acetate , polyvinyl chloride , thermal stability , polymer chemistry , heat deflection temperature , plasticizer , composite material , ethylene , izod impact strength test , melt flow index , polymer , chemical engineering , ultimate tensile strength , chemistry , organic chemistry , catalysis , engineering
Abstract Five to 15 percent of ethylene/vinyl acetate copolymers was compounded into rigid polyvinyl chloride, with the copolymers dispersed as discrete micro‐domains, produced very efficient synergistic improvement of impact strength; as the vinyl acetate content of the copolymer increased from 28 to 60 percent, the synergistic peak moved to higher copolymer content and became higher and broader. Copolymer content correlated directly with melt flow and thermal stability, and inversely to modulus, strength, and heat‐deflection temperature. The vinyl acetate content of the copolymer correlated directly with elongation, impact strength, and thermal stability, but inversely to modulus, heat‐deflection temperature, low‐temperature flexibility, and melt flow. When the copolymer content reached 25 percent, it formed a second continuous‐phase, interpenetrating the polymer network structure and acting as a polymeric plasticizer, producing thermoplastic elastoplastics.