“一锅法”均相合成热塑性纤维素丙酸酯接枝聚乳酸共聚物

Thermoplastic Cellulose Propionate-graft-Poly(L-lactide) Copolymers Homogeneously Synthesized by "One Pot" Process from Native Cellulose

纤维素重复单元的羟基上引入足够数量的柔性分子链，有可能在破坏纤维素分子链间氢键的同时起到内增塑作用，从而赋予纤维素熔融流动性,由纤维素酯化反应得到的一些短链取代的纤维素酯[如纤维素醋酸酯（CA）、纤维素丙酸酯（CP）等]具有热塑性，但需要在外加大量增塑剂条件下才能熔融加工,接枝共聚合是改变纤维素物理化学性质的另一种有效方法,

Using native cellulose as the starting materials and 4-dimethylaminopyridine （DMAP） as the cata- lyst, a series of novel cellulose propionate-graft-poly （L-lactide） eopolymers （CP-g-PLAs） was synthesized in an ionic liquid AmimC1 via ＂one pot＂ process. DMAP can effectively catalyze the propionylation of cellulose with propionic anhydride and the subsequent ring-opening grafting copolymerization of L-lactide （LA） from re- sidual hydroxyl groups in cellulose. The structure of CP-g-PLA copolymers could be well controlled by chan- ging the molar ratio of propionate hydride/cellulose and LA/cellulose. When PLA content above 27.46%, the copolymers exhibited thermoplastic behavior and could be shaped by conventional melt processing methods, such as injection molding.