Properties and Degradability of Melt-spun Fibers of Poly(butylene succinate) and its Copolymer with L-Lactic Acid.

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Abstract
High polymers of poly (butylene succinate) (PBS) and poly (butylenesuccinate-co-L-lactide) (PBSL) were melt-spun by the on-line spinning and drawing technique. The PBS fibers were drawn 4-12 times, while the PBSL fibers were drawn 4-40 times. The structure and properties of these drawn fibers were studied by tensile test, WAXS, birefringence, and SEM. It was revealed that the tensile strength and modulus of the PBS and PBSL fibers increased with increasing draw ratio while their tensile elongation was kept significantly high because of the low glass transition temperature of both polymers. The molecular orientation of these fibers were comparable with that of the ordinary synthetic fibers such as Nylon 6 as judged by birefringence. Both PBS and PBSL fibers were found to be degraded quickly by enzymatic hydrolysis using a lipase originated from Pseudomonas, while they were little degraded in phosphate buffer (pH 7.0). The inclusion of a small amount of L-lactic acid units into the PBS sequences gave little effect on the degradability and mechanical properties of these fibers.

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