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The effect of radiation on copolymers of styrene and α-methylstyrene

✍ Scribed by Kotliar, A. M.

Publisher
John Wiley and Sons
Year
1961
Weight
477 KB
Volume
55
Category
Article
ISSN
0022-3832

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✦ Synopsis

Abstract

The G values for chain scission G(s) and crosslinking G(γ) processes were determined for unfractionated and fractionated polymers having 50–50 and 25–75 mole‐%α‐methylstyrene and styrene content and are in agreement with the reported values for the respective homopolymers, corrected for mole content. These values are G(s) = 0.12, G(γ) = 0.062, G(s) = 0.10, and G(γ) = 0.094 for the 50–50 and 25–75 copolymers, respectively. The evaluation of the resulting intrinsic viscosities from the distributions computed by the Monte Carlo sampling technique in the interval, O < P < 10 P̄~n,o~, and Small's asymptotic expansion in the interval P~n,o~ ≦ P ≦ ∞ show the best correlation when g′ values (the ratio of the mean square radii of a branched to linear molecule identical in size and composition) of 0.79 and 0.72 are used for each interval, respectively.

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