脂肪族聚碳酸酯(PPC)与聚乳酸(PLA)共混型生物降解材料的热学性能、力学性能和生物降解性研究  

THERMAL CHARACTERISTICS, MECHANICAL PROPERTIES AND BIODEGRADABILITY OF POLYCARBONATES/POLY(LACTIC ACID ) (PPC/PLA) BLENDS

作　　者：王淑芳[1,4] 陶剑[2] 郭天瑛[1] 付涛[3] 袁晓燕[3] 郑俊萍[3] 宋存江[2] 

机构地区：[1]南开大学高分子化学研究所,功能高分子材料教育部重点实验室,天津300071 [2]南开大学生命科学学院微生物学系,生物活性材料教育部重点实验室,天津300071 [3]天津大学材料学院,天津300072 [4]天津南开歌德科贸有限公司

出　　处：《离子交换与吸附》2007年第1期1-9,共9页Ion Exchange and Adsorption

基　　金：国家自然基金(20374032);天津市重点攻关专项(05YFSZSF02200)

摘　　要：通过溶液浇铸法制备了脂肪族聚碳酸酯与聚乳酸的共混物(PPC/PLA)。采用示差热分析(DSC)和热重分析(TG)研究了材料的热性能。采用拉伸力学试验研究了共混物的力学性能。通过土壤悬浊拟环境培养降解实验法和扫描电子显微镜分析(SEM)对共混材料的生物降解性能进行了研究。实验结果表明,随着PPC含量的增加,共混物的拉伸强度和杨氏模量降低,而生物降解速率却显著提高。但是,在一定的降解时间内,某些比例共混物的降解速率比100%PPC还要快。综合分析表明,PPC/PLA是力学性能和降解性能可以互补的共混体系。Polycarbonates/poly（lactic acid） （PPC/PLA） blends were prepared by solution cast method. The thermal characteristics were studied by means of differential scanning calorimetry （DSC） and thermogravimetry （TG）. Mechanical properties of the blends were investigated by tensile mechanical test. Biodegradability for PPC/PLA blends was investigated in detail by soil suspension cultivation and scanning electron microscopy （SEM）. Experimental results indicated that increasing PPC content led to decrease in tensile strength and modulus, and yet significantly increase the rate of biodegradation of the blends. But at some blend ratios, the rate of weight-loss of PPC/PLA blends （20/80, or 40/60） was faster than that of pure PPC. PPC/ PLA blends possess a good combination of mechanical properties and biodegradation rate.

关 键 词：热学性能 力学性能 生物降解性 脂肪族聚碳酸酯(PPC) 聚乳酸(PLA) 共混 

分 类 号：O631[理学—高分子化学]