由二氧化碳和环氧丙烷生成的聚碳酸亚丙酯的合成与降解行为

由二氧化碳和环氧丙烷成功合成了高分子量、规则分子链结构的聚碳酸亚丙酯(PPC).13C NMR谱证明所得PPC共聚物具有交替结构.PPC的降解行为通过土壤埋藏法和溶液沉浸法来研究.结果表明在6个月后土壤埋藏的PPC膜比沉浸在缓冲溶液中的膜质量损失增加得更慢.而在缓冲溶液中沉浸的膜在最初的两个月中质量损失增加的很快,达到4.59%.吸水实验也同样显示在缓冲溶液中的PPC膜比土壤埋藏测试中吸水性更强.PPC膜的降解机理和样品的形态、红外光谱以及1H NMR谱相一致.扫描电镜形态和质量损失以及吸水测量的结果一致.

Synthesis and Degradation Behavior of Poly(propylene carbonate) Derived from Carbon Dioxide and Propylene Oxide

High molecular weight and regular molecular structure poly(propylene carbonate) (PPC) was successfully synthesized from carbon dioxide and propylene oxide. The PPC copolymer structure was an exact alternating copolymer as evidenced by the 13C NMR technique. Degradative behavior of the PPC was conducted by soil burial and buffer solution immersion (pH=6) tests, respectively. The results showed that the weight loss of soil buried PPC films increased more slowly than that immersed in the buffer solution after 6-month exposure. However, the weight loss of sample immersed in the buffer solution increased rapidly during the first two months and reached a value of 4.59%. Water sorption measurement also revealed that the PPC membranes immersed in buffer solution were more hydrophilic than those in soil burial tests. The degradation mechanism of PPC membranes was correlated with the sample morphologies, FTIR and 1H NMR spectra. The SEM morphologies were consistent with the weight loss and water sorption measurements.