文献类型：期刊文献

中文题名：交联密度对脂肪族聚氨酯弹性体结构与性能的影响

英文题名：EFFECT OF CROSSLINK DENSITY ON THE STRUCTURES AND PROPERTIES OF ALIPHATIC POLYURETHANE ELASTOMER

作者：朱广超[1];王贵友[1];胡春圃[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237

年份：2011

卷号：21

期号：3

起止页码：274

中文期刊名：高分子学报

外文期刊名：Acta Polymerica Sinica

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000289316500007)】；北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家科技部项目"汽车座椅革用聚氨酯树脂的研究与开发"(项目号2009GJC00035)资助

语种：中文

中文关键词：脂肪族聚氨酯,交联密度,形态结构,力学性能

外文关键词：Aliphatic polyurethane elastomer, Crosslink density, Morphology and structure, Mechanicalproperty

摘要：采用异佛尔酮二异氰酸酯(IPDI)与聚醚二元醇、三羟甲基丙烷(TMP)和1,4-丁二醇反应制备了具有不同交联密度的脂肪族聚氨酯弹性体.研究结果表明,当聚氨酯弹性体的硬段含量为40 wt%时,随着TMP含量的增加,聚氨酯弹性体的交联密度线性增加.随着聚氨酯弹性体交联密度的提高,聚氨酯中硬段相的玻璃化转变温度由32℃降为21℃,聚氨酯中氨酯羰基的氢键化程度由83%降至63%,这个结果说明聚氨酯中软硬相的微相混合程度增加.聚氨酯弹性体的耐热性能随交联密度的提高而得到明显改善.力学实验结果表明,交联结构使弹性体的杨氏模量、100%定伸应力和硬度明显提高,断裂伸长率减小.
A series of crosslinked aliphatic polyurethane （PU） elastomers with various crossslink densities were synthesized by the reaction of isophorone diisocyanate （IPDI） with polyether diol, trimethylolpropane （TMP） and 1,4-butanediol （BDO） through one step method. The results showed that the erosslink density of PU elastomers exhibited a linear relationship to the content of TMP,while the content of hard segments of PU elastomers was fixed at 40 wt%. With the increase of the crosslink density of the PU elastomers, the glass transition temperature （Tg） value of the hard segment domains in the PU dropped significantly from 32℃ to 21~C ,the Tg value of the soft segment domains in the PU dropped slightly form -47℃ to -48~C ,and the degree of H-bonded urethane carbonyl in the PU decreased from 83% to 63% ,which indicated that the microphase miscibility of the PU elastomers was enhanced. With the increase of the crosslink density of the PU elastomers,the TGA results showed that the onset decomposition and the maximum decomposition temperature of the PU elastomers increased from 285℃ to 319℃ and 325℃ to 349℃ respectively,which indicated that the thermal stability of the PU elastomers was also improved. The mechanical test indicated that the Young＇ s modulus,modulus at 100% extension and Shore A hardness of the PU elastomers significantly increased with the increase of the crosslink density of PU,while the elongation at break decreased.