Polystyrene modifications. I. Styrene copolymers

摘要

AbstractTheTgof polystyrene was raised by copolymerization with acenaphthylene. Although physical properties of S20A polymer equaled or surpassed those of polystyrene, the addition of butadiene, mineral oil, or isoprene to poly(styrene‐co‐acenaphthylene) drastically reduced theTg. The reduction ofTgof S20A by the addition of butadiene was less severe when butadiene was added several hours after the polymerization had begun. The incompatible terpolymers were flexible but showed no improvement in craze resistance. Crazing has been explained as being caused by forces concentrated in regions of irregularit