Citation: . A STUDY OF STRUCTURE AND PROPERTY CHANGES OF BIODEGRADABLE POLYGLYCOLIDE AND POLY(GLYCOLIDE-co-LACTIDE)FIBERS DURING PROCESSING AND IN VITRO DEGRADATION*[J]. Chinese Journal of Polymer Science, ;2003, 21(2): 159-167. shu

A STUDY OF STRUCTURE AND PROPERTY CHANGES OF BIODEGRADABLE POLYGLYCOLIDE AND POLY(GLYCOLIDE-co-LACTIDE)FIBERS DURING PROCESSING AND IN VITRO DEGRADATION*

Received Date: 31 August 2002

Structure and properties of bioabsorbable polyglycolide (PGA) and poly(glycolide-co-lactide) (PGA-co-PLA)fibers were investigated during several industrial processing stages and in vitro degradation by means of wide-angle X-raydiffraction (WAXD), dynamic mechanical analysis (DMA) and mechanical property tests. In the orientation stage, the PGA fibers were found to have higher degrees of crystallinity than corresponding PGA-co-PLA samples produced under similar conditions. In the hot-stretching and post-annealing stages,after fibers were braided,PGA samples were found to gain more crystallinity and higher Tg than PGA-co-PLA samples.The higher crystallinity in PGA fibers resulted in a slower rate of degradation.DMA results showed that a great deal of internal stress that was built during orientation and hot-stretching stages was released in the post-annealing stage for all PGA and PGA-co-PLA samples.During earlier stages of in vitro degradation,both PGA and PGA-co-PLA samples exhibited the typical cleavage-induced crystallization mechanism.The heat shrinkage in the glass transition area was found to disappear after 6-8 days of degradation for all PGA and PGA-co-PLA samples,indicating the amorphous portions of the polymers lost orientation after a short period in the buffer solution,most likely due to relaxation of the cleaved chains.
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