含葡萄糖基聚乳酸立构复合物的制备及其性能研究

doi:10.3969/j.issn.0253-2417.2018.05.003

林产化学与工业 ›› 2018, Vol. 38 ›› Issue (5): 17-22.doi: 10.3969/j.issn.0253-2417.2018.05.003

含葡萄糖基聚乳酸立构复合物的制备及其性能研究

曹丹, 明伟, 祁俐燕, 赵银屏, 高勤卫

南京林业大学化学工程学院, 江苏南京 210037

收稿日期:2018-06-28 出版日期:2018-10-25 发布日期:2018-11-06
通讯作者: 高勤卫,教授,博士,硕士生导师,研究领域为生物高分子材料;E-mail:gqw@njfu.com.cn。 E-mail:gqw@njfu.com.cn
作者简介:曹丹(1993-),女,江苏南通人,硕士生,研究方向为生物高分子材料;E-mail:1020233375@qq.com
基金资助:
国家自然科学基金资助项目（31200451）；林业公益性行业重大科研专项（201204803）；江苏高校优势学科建设工程资助项目（无编号）

Preparation and Properties of Poly(Lactic Acid) Stereocomplex Containing Glucose Groups

CAO Dan, MING Wei, QI Liyan, ZHAO Yinping, GAO Qinwei

College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China

Received:2018-06-28 Online:2018-10-25 Published:2018-11-06

摘要/Abstract

摘要： 为了改善聚乳酸材料的结晶性能、耐热性能和亲水性，以乳酸和葡萄糖为原料，熔融聚合制备了聚L-乳酸-葡萄糖共聚物（PLLAG）和聚D-乳酸-葡萄糖共聚物（PDLAG），并将PLLAG和PDLAG溶液共混，制备含葡萄糖基的聚乳酸立构复合物（sc-PLAG）材料。采用傅里叶变换红外光谱（FT-IR）、差示扫描量热（DSC）法、X射线衍射（XRD）法、偏光显微镜（POM）法和接触角法等对sc-PLAG进行表征，结果表明：sc-PLAG的立构复合结晶（SC）结构由PLLAG的L-乳酸链段与PDLAG的D-乳酸链段相互作用而形成的，结晶速度快、球晶形貌规整。当PLLAG用量为40%~60%时，sc-PLAG只生成立构复合结晶；当PLLAG用量小于40%或大于60%时，sc-PLAG则同时含有SC和同质结晶（HC）。当葡萄糖基质量分数均为5%时，所有sc-PLAG的SC熔点（T_m）均为197.5℃，与PLLAG用量无关。sc-PLAG的玻璃化转变温度（T_g）、T_m和接触角均随着葡萄糖基质量分数的增加而降低，但其结晶度则随着葡萄糖基质量分数的增加而增大，当葡萄糖基质量分数为5.0%时结晶度最大，为53.84%。含葡萄糖基的聚乳酸立构复合物改善了聚乳酸材料的结晶性能、耐热性能和亲水性。

关键词: 聚L-乳酸, 葡萄糖, 聚乳酸-葡萄糖共聚物, 立构复合物

Abstract: In order to improve the thermal performance and hydrophilcity of poly(lactic acid) materials, the copolymers such as poly(L-lactic acid-co-glucose) (PLLAG) and poly(-lactic acid-co-glucose) (PDLAG) were prepared by direct polymerization with lactic acid and glucose as raw materials. Then the stereocomplex of PLLAG and PDLAG were prepared by solution blending method, and thus stereocomplex materials of poly(lactic acid) with glucose groups (sc-PLAG) were obtained. sc-PLAG was charterized by FT-IR, DSC, XRD, POM and contact angle method. The results showed that stereocomplex crystal (SC) of sc-PLAG was formed by the interaction between L-lactic acid units of PLLAG and D-lactic acid units of PDLAG at rapid crystallization rate, and SC possessed regular spherulite morphology. sc-PLAG only possessed stereocomplex crystalline as the mass contents of PLLAG in sc-PLAG were from 40% to 60%, and sc-PLAG might have homogeneous crystalline (HC) and SC as the amounts of PLLAG in sc-PLAG were more than 60% or less than 40%. The melt points (T_m) of stereocomplex crystal of all sc-PLAG samples with the mass fraction of glucose 5% were 197.5℃, nearly irrelevant to PLLAG amount. The glass transition temperature(T_g) of sc-PLAG, T_m of SC, and the contact angle of sc-PLAG decreased with increasing glucose mass fraction, while sc-PLAG crystallinity increased with increasing glucose mass fraction, reaching to the maximum of 53.84%. In conclusion, the stereocomplex of poly(L-lactic acid) with glucose groups improves the crystallization, hydrophilcity, and thermal performance.

Key words: poly(L-lactic acid), glucose, poly(lactic acid)-co-glucose copolymer, stereocomplex

中图分类号:

TQ35

曹丹, 明伟, 祁俐燕, 赵银屏, 高勤卫. 含葡萄糖基聚乳酸立构复合物的制备及其性能研究[J]. 林产化学与工业, 2018, 38(5): 17-22.

CAO Dan, MING Wei, QI Liyan, ZHAO Yinping, GAO Qinwei. Preparation and Properties of Poly(Lactic Acid) Stereocomplex Containing Glucose Groups[J]. Chemistry and Industry of Forest Products, 2018, 38(5): 17-22.

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含葡萄糖基聚乳酸立构复合物的制备及其性能研究

Preparation and Properties of Poly(Lactic Acid) Stereocomplex Containing Glucose Groups

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