聚天冬氨酸酯聚脲的动态力学行为研究  

Research on the Dynamic Mechanical Properties of Polyureas Based on Polyaspartic Esters

作　　者：吕平[1] 陈国华[2] 黄微波[2] 

机构地区：[1]青岛理工大学土木工程学院,青岛266033 [2]中国海洋大学化学化工学院,青岛266003

出　　处：《武汉理工大学学报》2007年第4期61-63,共3页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50373009);建设部科技攻关项目(A04-2-033)

摘　　要：通过聚天冬氨酸酯(PAE)与脂肪族异氰酸酯六亚甲基二异氰酸酯(HDI)三聚体/聚四亚甲基二醇(PTMG)预聚物反应,合成了一系列PAE聚脲,考察了PAE种类、软段分子量及成型温度对聚脲动态力学性质的影响。实验结果表明,三官能度PAE-F扩链的聚脲具有较高的低温和高温储能模量(E’)及硬段玻璃化转变温度(Tgh),其微相分离程度也高于二官能度PAE-a扩链的聚脲。软段分子量较高的聚脲向于微相分离。室温成型的聚脲为半相容结构,成型温度提高至60℃时,呈现微相分离结构。Several polyaspartic esters （PAE） based polyureas were prepared from synthesized PAE and hexamethylene diisocyanate（HDI） trimer/polytetramethylene ether glycol （PTMG） prepolymer. The dynamic mechanical analysis （DMA） was used to reasearch the effect of PAE structure, length of soft segments and curing temperatures on the morphology and mechanical properties of these polyureas. The results indicated that the polyurea exhibits larger storage modulns（E＇ ）, higher glass transi- tion temperature of hard segment（Tgh）, and higher level of microphase separation when three degree of functional PAE-F was used as chain extender instead of two degree of functional PAE-a. Polyurea contenting longer soft segment exhibits a higher level of microphase separation. While curing at room temperature, the polyurea was related with a half compatibility morphology, while curing at 60 ℃ it was related with better microphase separated morphology.

关 键 词：聚脲 聚天冬氨酸酯 动态力学性质 微相分离 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]