不同硬段含量聚天冬氨酸酯聚脲结构和性能研究  

Research on morphology and properties of polyaspartic ester polyurea with different hard segment contents

作　　者：吕平[1] 陈国华[1] 黄微波[2] 

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

出　　处：《现代化工》2006年第9期28-31,33,共5页Modern Chemical Industry

基　　金：国家自然科学基金项目(50373009)

摘　　要：通过聚天冬氨酸酯、端氨基聚醚与脂肪族异氰酸酯六亚甲基二异氰酸酯三聚体／预聚物反应，合成了纯硬段聚脲和不同硬段含量的聚脲，并考察了硬段含量对聚脲的结构形态、动态力学性质和力学性质的影响。硬段含量为73％．50％的聚脲呈现微相分离的形态，随着硬段含量降低，软段和硬段相的混合程度提高，脲羰基的氢键化程度增加，NH基氢键键长增加，硬段玻璃化转变温度Tgh女降低，软段玻璃化转变温度Tgs的变化幅度较小，微相分离程度降低。材料的拉伸强度、模量和硬度随着硬段增加而提高，弹性则随之降低。Pure hard segment polyaspartic esters（PAEs） polyurea and several segmented PAEs polyureas with different hard segment contents were prepared from synthesized PAEs, amine teminated polyoxypropylene and aliphatic polyisecyanates 1, 6＇-hexamethylene diisocyanate（ HDl）/prepolymer. The morphology ,dynamic mechanical properties and mechanical properties of the polyureas were studied. Polyttreas containing 73% - 50% of hard segment exhibited some microphase-separated morphology. The polyureas with less hard segment contents showed a better compatibility between soft and hard segments, a higher degree of hydrogen-bonded urea carbonyl,a longer bond length of hydrogen bonded amidogen,a lower glass transmission temperature regions of hard segment Tgh, and a higher degree of microphase separation in the system, but a little change of the glass transmission temperature regions of soft segment Tgs. The tensile strength, modulus and hardness of polyurea specimens were enhanced with the increasing of the hard segment content, however the elasticity was decreased.

关 键 词：脂肪族聚脲 聚天冬氨酸酯 力学性质 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]