【作者】 徐玲；

【导师】 杨成；

【作者基本信息】 江南大学 ， 材料学， 2008， 硕士

【摘要】 本论文以脂肪酶为催化剂,通过非水相酶催化分别合成了淀粉/ε-己内酯接枝共聚物和淀粉/L-丙交酯接枝共聚物。利用红外光谱仪(IR)、核磁共振仪(NMR)、差示扫描量热分析仪(DSC)和X射线衍射仪(XRD)等对合成的接枝共聚物进行了表征,讨论了接枝共聚反应中反应条件对接枝率及其相关性能的影响。在有机溶剂DMSO中,以猪胰脂肪酶为催化剂,合成了淀粉/ε-己内酯接枝共聚物。利用红外光谱和核磁共振谱对产物进行了表征。结果表明ε-己内酯已成功的接枝到了淀粉上,并且接枝部分ε-己内酯有97%接枝到了淀粉C2和C3位的羟基上。研究了温度、初始水活度、pH值、底物摩尔比(己内酯/淀粉重复单元)对接枝率的影响。发现温度为50℃、初始水活度为0.75、pH值为7.5、底物摩尔比大于6时接枝效果较好。通过DSC研究了其热性能,并研究了其在酸碱溶液中的降解行为以及产物在不同溶剂中的溶解性能。在有机溶剂DMSO中,以诺维信435(Novozyme435)为催化剂,合成了淀粉/L-丙交酯接枝共聚物。利用红外光谱和核磁共振谱对产物进行了表征。研究了不同底物摩尔比(St/LA)对产物性能的影响。研究了产物的热性能、溶解性能以及可降解性能。以不同来源淀粉及L-丙交酯为底物,以诺维信435(Novozyme435)为催化剂,合成了不同来源淀粉/L-丙交酯接枝共聚物。利用红外光谱、核磁共振谱等对产物进行了表征。通过对不同淀粉来源淀粉成分、内部结构等详细性能的分析,讨论了不同来源淀粉接枝产物性能上的差别。研究了产物的热性能、溶解性能以及可降解性能。更多还原

【Abstract】 The preparation of starch/ε-Caprolactone grafted copolymer and starch/ L-lactide grafted copolymer by using lipase as catalyst in non-aqueous system was investigated. The structure of these copolymers was characterized with FTIR, NMR, DSC and XRD. The effect of temperature, initial water activity, pH, and the ratio of CL to starch on the grafted copolymerization was studied.Starch/ε-Caprolactone grafted copolymer was synthesized by using porcine pancreatic lipase as catalyze in DMSO solution. The structure of the copolymer was characterized by FTIR and NMR. The results indicated that PCL was grafted on the starch and more than 97 percent PCL was grafted at the hydroxys of C2,C3 of starch. The effect of temperature, initial water activity, pH, and the ratio of CL to starch on the grafted copolymerization was investigated. The results indicated that the optimum synthesis conditions were as follows: temperature 50℃, initial water activity 0.75, pH7.5, the molar of CL to starch is above 6. The thermal properties, dissolution properties and degradation properties of copolymer was studied.Starch/L-lactide grafted copolymer was synthesized by using Novozyme435 as catalyze in DMSO solution. The structure of the copolymer was characterized by FTIR and NMR. Research the effect of molar ratio of the substrates (St/LA) on grafting rate and copolymers’thermal properties, dissolution properties and degradation in acid-base solution.Starch/L-lactide grafted copolymer with different sources of starch was prepared by using Novozyme435 as a catalyst. The structure of the copolymer was characterized by FTIR and NMR. The relationship between the sources, composition, internal structure of starch and the properties of grafted copolymer was discussed.更多还原