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The A-B-A tribloc copoly (ester-ether) comprising poly (L-lactide) (A) and poly(oxyethylene-co-oxypropylene) (B) was prepared by copolymerization of L-lactide and a commercially available telechelic copolyether, PluronicrTM (PN) by the catalysis of tin octanoate. The copolymers were melt-spun by the conventional method. Then, the as-spun filament obtained was drawn to 2.5-12.5 times at 40 and 60°C. At a constant draw ratio the tensile modulus of the filament decreased with increasing composition of PN in the copolymer and with increasing draw ratio. Upon immersion in a phosphate buffer (pH=7.4), the filaments showed a time-dependent decrease in tensile strength with accompanying surface erosion. The degradability of the filaments with the same identical copolymer compositions was found to decrease with increasing draw ratio, because of the increased orientational crystallization of PLLA. The block copolymers comprising PLLA and PN, therefore, were shown to have high potentiality as the biodegradable polymers with improved flexibility and biodegradability.

Properties and Degradability of the Fibers of Block Copoly(ester-ether) Comprising Poly(L-lactide) and Poly(oxyethylene-co-oxypropylene).