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非异氰酸酯聚氨酯的合成
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摘要
由异氰酸酯和多元醇合成的传统聚氨酯具有优良性能而受到广泛应用,但传统聚氨酯同时也存在性能和安全等方面的缺点。由多环碳酸酯和多元胺合成而来的非异氰酸酯聚氨酯有望成为一种性能良好的绿色环保材料替代传统聚氨酯。本论文旨在选择了一条新型而有效的合成路线来制备非异氰酸酯聚氨酯。
     1.使用双金属氰化物催化剂聚合环氧氯丙烷得到聚环氧氯丙烷醚,然后再和叔胺反应得到高分子季铵盐,制备下一步反应所需的高分子催化剂。核磁共振对反应产物进行结构分析。研究表明,环氧氯丙烷聚合反应的诱导期随着催化剂浓度的增加而减小,总的聚合反应时间也减小,聚合反应和季铵化反应最适宜的温度分别是110℃和90℃,三甲胺大量过量时能得到转化率比较高季铵盐,同时三甲胺作叔胺反应效果最好。
     2.使用双金属氰化物催化剂对高活性聚醚进行封端反应,得到聚醚末端带有一定数量环氧氯丙烷的邻氯醇聚醚,然后再和氨水反应能得到端氨基聚醚。核磁共振图谱证实了最终反应产物的生成。实验中通过一系列的对比实验探讨了第二步反应的最佳条件,反应的最佳反应温度是110℃,反应最佳原料摩尔配比氨水:氯甲基=5:1,最佳反应时间为6h。
     3.以季铵盐为相转移催化剂,碳酸氢盐离子与端邻氯醇聚醚在溶剂中反应得到端环碳酸酯聚醚,红外和核磁共振表征结果证实了环碳酸酯基团的生成。研究表明,溶剂的极性和相转移催化剂的分子结构影响着反应转化率。实验同时对不同阶段的产物做了粘度测定,同一分子量下粘度顺序为:端氯醇聚醚>端环碳酸酯聚醚>端羟基聚醚。
     4.将三官能度端环碳酸酯聚醚与双官能度伯胺反应得到非异氰酸酯聚氨酯(NIPU),做谱图分析。研究表明:乙二胺形成的NIPU的玻璃化温度最高,力学性能最好,当环碳酸酯与伯胺的摩尔比为1:1时,得到物理和力学性能较好的NIPU。甲苯溶胀实验同时表明乙二胺形成的NIPU具有较大的交联密度。
Polyurethanes obtained from diisocyanates and diols are attractive and important chemical products with extensive application in various fields because of its excellent properties,but traditional polyurethane have some formidable defects such as toxicity, poor hydrolytic stability and insufficient permeability.New generation polyurethane, nonisocyanate polyurethane(NIPU),which shows lower permeability,higher chemical resistance and non-poisonous fabrication process compared with traditional polyurethane,is obtained from multifunctional cyclic carbonates and multifunctional primary polyamines.The synthesis route and conclusion are as follows:
     1.The polymerization of epichlorohydrin was catalyzed by double metal cyanide (DMC),and then the polymer reacted with tertiary amine to give polymer quaternary ammonium salt.Different reaction conditions were discussed in this two-step reaction and the reaction products were confirmed by NMR analysis.The studies showed that: The induction period and total reaction time get shorter as the concentration of catalyst enhanced,the optimum time of polymerization and quaternization reaction are 110℃and 90℃,respectively.The suitable material ratio of chloromethyl and trimethylamine were 2.5,the cationic degree of polymer quaternary ammonium salt from trimethylamine was higher than that from triethylamine and pyridine.
     2.A novel amine-terminated polyether(ATPE) was synthesized with two steps. The first was that vic-chlorohydrins-terminated polyether was obtained through high reactive polyether polyols reacting with epichlorohydrin catalyzed by(DMC).The second was that vic-chlorohydrins-terminated polyether(CHTPE) reacting with ammonia to form amine-terminated polyether.We found the rule of graft numbers of epichlorohydrin,and quantitative determined amine value of product to study the effect factors of reaction.Structure of product was signified by using ~1HNMR.When the optimal reaction temperature is 110℃,the ratio of raw is 5:1 and the reation time is 6h,the conversion of ATPE would reach about 90%.
     3.The cyclocarbonate- terminated polyether(CCTPE) can be obtained by reacting CHTPE with alkali metal hydrocarbonate in the presence of quaternary ammonium catalysts.98%yield of CCTPE was obtained by optimizing reaction condition through choosing different catalysts,solvents,and reaction temperature.~1HNMR and FTIR spectra have been used to analyze target product. The research showed that:the polarity of solvent and the molecular weight and compatibility of phase transfer catalyst have a significant impact on conversion,the viscosity of different stage reaction product have been tested,the order was:CCTPE> CHTPE>HTPE.
     4.Tri-functionality cyclocarboanate reacted with difunctional primary amine to afford crosslinking network nonisocyanate polyurethanes.All cured products were characterized for their thermal and mechanical properties to find out the effect of carbonate-to-amine ratio and type of amine.The research showed that:diethylamine based NIPU have the most excellent properties,and when carbonate-to-amine ratio is 1:1,the products have the most favorable overall performance.Swelling in toluene show that diethylamine based NIPU have the lowest value because of its highest crosslinking density.
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