叔醇扩链的交联聚氨酯弹性体的结构和力学性能  

Structures and mechanical properties of cross-linked polyurethane elastomers extended by tertiary alcohol

作　　者：菅国栋 刘畅 严红烨 张冬 陈红祥 周瑜 JIAN Guo-dong;LIU Chang;YAN Hong-ye;ZHANG Dong;CHEN Hong-xiang;ZHOU Yu(School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学化学与化工学院,湖北武汉430081

出　　处：《热固性树脂》2022年第5期22-26,33,共6页Thermosetting Resin

基　　金：催化转化与能源材料化学教育部重点实验室,催化材料科学湖北省重点实验室开放基金(CHCL 19004)。

摘　　要：采用二苯基甲烷二异氰酸酯、六亚甲基二异氰酸酯三聚体、聚四氢呋喃醚二醇、2,5-二甲基-2,5-己二醇为原料制备了不同交联度的叔醇扩链聚氨酯弹性体,通过溶胀度测试、红外光谱、示差扫描量热分析等表征了其结构,研究了交联度对聚氨酯弹性体力学性能和热稳定性的影响,同时通过应力松弛和循环拉伸分析了其动态可逆性。结果表明,叔醇扩链所得交联聚氨酯弹性体具有较好的热稳定性,90~120℃时具有动态可逆性。随着交联度减小,聚氨酯弹性体的拉伸强度和断裂伸长率呈现不断增长趋势,这为交联聚氨酯的再利用提供了依据。The polyurethane elastomers extended by tertiary alcohol with different cross-linking degrees were prepared using diphenylmethane diisocyanate,hexamethylene diisocyanate trimer,poly(tetramethene ether)glycol and 2,5-dimethyl-2,5-hexanediol as raw materials.The product structure was characterized and the effects of cross-linking degree on the mechanical properties and the thermal stability of polyurethane elastomer were studied by infrared spectroscopy,swelling degree test and differential scanning calorimetry.The dynamic reversibility of the product was analyzed by stress relaxation and cycle loading.The results showed that the polyurethane elastomers extended by tertiary alcohol had good thermal stability and had dynamic reversibility at 90-120℃.The tensile strength and the elongation at break of the polyurethane elastomer were increased with the decrease of cross-linking degree and this provided a basis for the reuse of cross-linked polyurethane.

关 键 词：聚氨酯 二元叔醇 扩链 弹性体 热稳定性 动态可逆性 再利用 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]