Commercial poly(p-phenylene
sulfide) (PPS) was thermally cured, which resulted in an increase of molecular
weight due to cross-linking. Non-isothermal crystallization studies of samples
cured for up to 7 days at 250?C showed a monotonous increase of crystallization
temperature compared to pure PPS. However, a further increase of curing time decreased
the crystallization temperature. The change in the half-crystallization time (t1/2) was similar to the
crystallization temperature. Thus, the cross-linking of PPS affected
crystallization behaviors significantly. To a certain
extent, crosslinks acted as nucleation agents, but excessive cross-linking
hindered the crystallization. Morphologies observed by polarized optical
microscopy suggested that thermal curing for as little as 1 day contributed to
the spherulitic structure having a smaller size, that was not observed with
pure PPS.
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