摘要
采用聚四氢呋喃二醇(PTMG2000)与二苯基甲烷二异氰酸酯(MDI)合成一系列不同异氰酸指数(R值)的预聚体,用对苯二胺(PPDA)进行扩链反应,扩链系数为1.0,合成了聚氨酯弹性体(PUE),并进行热失重(TG)、红外光谱(FT-IR)、X射线衍射(XRD)分析和力学性能测试。结果表明,随着R值的增加,硬段含量增加,PUE的耐热性逐渐变差;断裂伸长率、拉伸强度和结晶度均先增大后减小,且在R值为1.6时最大。
A series of NCO terminated prepolymers with different isocyanate index （R ） were synthesized by polytetrahydrofuran polyol （ PTMG2000 ） and diphenyl-methane-diisocyanate （ MD1）. The polyurethane elastomer （PUE） was synthesized by the prepolymers chain extended with＆phenylenediamine（PPDA）,while the chain exten-sion coefficient was 1. 0. The synthesized samples of PUE were characterized by thermal gravity（TG）,Fourier trans-form infrared spectrometer（FT-1R）, X-ray diffraction（XRD） and mechanical properties test. The results showed that the heat resistance decreased with the value of R increased while the content of hard segment increased. The elonga-tion at break, tensile strength and crystallinity of PUE samples reached maximum values when R was 1.6.
出处
《聚氨酯工业》
北大核心
2017年第1期37-39,共3页
Polyurethane Industry
关键词
聚氨酯弹性体
对苯二胺
耐热性
polyurethane elastomer
p- phenylenediamine
heat resistance
