Degradation of graft polymer and blend based on cellulose and poly(L-lactide)

摘要

Degradable polymers were prepared by blending and graft polymerization of cellulose and poly(L-lactide) (PLLA). The cellulose/poly(L-lactide) blends and cellulose-graft-poly(L-lactide) polymers were characterized by FTIR, NMR, DSC, and TGA. Wide-angle X-ray powder diffraction (WAXD) and degradation tests [by alkaline, phosphate-buffered saline solution (PBS), and enzyme solution] showed changes in the crystalline structure as a result of degradation. The results indicated that blending and graft polymerization could affect crystallization of the polymers and promote the degradability. The polymers with low degree of crystallinity showed higher degradability. In contrast, enzyme, alkaline, and PBS degradated material decreased rate of polymers degradation. In addition, high levels of PLLA resulted in a decrease in degradation.