中文摘要：

合成了油溶性N，N-双十二烷基壳聚糖。以氯仿为共溶剂，采用溶液共混法，制备了各种不同比例的N，N-双十二烷基壳聚糖（NDLC）／L-聚乳酸（PLLA）共混物。TG实验表明，聚乳酸的介入提高了N，N-双十二烷基壳聚糖的热分解温度。DSC实验表明，随着N，N-双十二烷基壳聚糖比例的增大，共混物中聚乳酸的结晶形态会发生改变，甚至出现无定形结构；而在两者比例相近时，共混物在115℃处出现一个新的吸热峰。

英文摘要：

Oil-soluble N, N - dilau formed by the reaction of chitosan an ryl chitosan was synthesized by d lauryl aldehyde. The product reducing the Schiff＇s base has been characterized by FT-IR, NMR and EA. In this paper, five different mass ratios of N, N-dilauryl chitosan/poly （L-lactic acid） blends have been prepared by solution blending using chloroform as solvent. TG experimental results show the thermal decomposition temperature of N,N-dilauryl chitosan in the blends are raised to 220℃ from 168 ℃. DSC experiments indicate the crystal structure of poly （L-lactic acid） in the blends have been changed and even become amorphous structure as the ratio of N,N-dilauryl chitosan increasing; it is worthy to notice that the blends appear a new peak at 115 ℃ when the ratio of two components in the blend is closely equal.