Advances in Chemical Engineering and Science
Volume 3, Issue 2 (April 2013)
ISSN Print: 2160-0392 ISSN Online: 2160-0406
Google-based Impact Factor: 1.41 Citations h5-index & Ranking
Effect of Curing Poly(p-Phenylene Sulfide) on Thermal Properties and Crystalline Morphologies ()
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ABSTRACT
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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