Molecular weight averages and distributions of unsaturated polyesters: Their effect on the properties of styrene‐crosslinked networks

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Abstract
Unsaturated polyesters have been synthesised and modified to determine the effect of number‐average molecular weight (M̄n) and molecular weight distribution (MWD) on the following properties of the polyesters after crosslinking with styrene: (i) water absorption, (ii) initial mechanical properties and (iii) property retention after immersion The most important factor was found to be the very low molecular weight ‘tail’ which adversely affected behaviour in several respects. Above a certain M̄n, initial mechanical properties were insensitive to the variables mentioned, but mechanical property retention after immersion closely reflected the water absorption behaviour by its dependence on the average chain length and the low molecular weight constituents. The importance of removing such constituents is apparent.

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