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- W1890166512 abstract "Thermal crosslinking of polydisperse styrene/p-methylstyrene copolymers with compositions of between 0 and 100 mol-% of styrene and weight-average molecular weights of about 300000 was investigated under oxygen-free conditions at 260°C and 275°C. At these temperatures the formation of oligomers was negligible. The reaction products were analysed by gel permeation chromatography and by swelling experiments. Two competing reactions — degradation and crosslinking — were found which occur to an extent proportional to copolymer composition. By comparing the properties of the treated copolymer samples—molecular weights, amount and characteristics of the gel—with the properties of pure poly(p-methylstyrene) samples degraded at 275°C it can be concluded that samples with 83 mol-% and 79 mol-% of styrene treated at 275°C and 260°C, respectively, should remain unchanged with respect to molecular weight and composition, because degradation and crosslinking compensate each other. In the samples containing less styrene crosslinking predominates. The ratio of the reaction rates determined experimentally agrees well with the value calculated from the reaction rates of the homopolymers given in the literature. A simple radical-chain mechanism is proposed that explains the experimental results." @default.
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- W1890166512 date "1987-11-01" @default.
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- W1890166512 doi "https://doi.org/10.1002/macp.1987.021881128" @default.
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