Citation: . PREPARATION AND PROPERTIES OF HIGH STRENGTH RODS FROM L-AND D,L-LACTIDE COPOLYMER[J]. Chinese Journal of Polymer Science, ;2001, 19(4): 351-357. shu

PREPARATION AND PROPERTIES OF HIGH STRENGTH RODS FROM L-AND D,L-LACTIDE COPOLYMER

Received Date: 9 July 2000
Revised Date: 25 August 2000

Starting with the L- and D,L-lactide copolymer (L:DL = 9: 1) [P(L-DL)LA] of Mw = 32.1×104, rods were obtainedthrough a two stage process: (1) melt-extrusion at 155℃, and (2) hot-drawing at 90℃ to various drawing ratios. Themolecular weight of P(L-DL)LA fell to 9.3×104 as a consequence of the production process. The crystallization andmolecular orientation of P(L-DL)LA developed as a result of the hot-drawing. The mechanical strengths of the rods increasewith the drawing ratio. The maximum for tensile strength,bending strength,bending modulus,and shear strngth are 329 MPa,237 MPa,8.8 GPa,and 157 MPa,respectively.
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