基于网络结构设计制备宽温域高阻尼聚氨酯弹性体  

Preparation of High Damping Polyurethane with Wide Temperature Range Based on Network Structure Designing

作　　者：李翰模 杨一林[1] 李志鹏[1] 卢王旬 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《高分子材料科学与工程》2017年第6期146-151,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21073066)

摘　　要：从网络结构角度出发,设计以聚乙二醇单甲醚(mPEG)与甲苯2,4-二异氰酸酯(TDI)反应所制得预聚体为悬挂链,聚酯二元醇和TDI反应制得预聚体为弹性链,超支化H201作为交联扩链剂制备无规网络结构的聚氨酯弹性体。采用动态力学分析仪、原子力显微镜以及正电子湮没寿命谱等表征其结构与性能,从自由体积、微相分离、氢键作用等结构与性能之间的关系深入探讨聚氨酯宽温域高阻尼机理。研究结果表明,随着悬挂链含量增加,R值(n(-NCO)/n(-OH))减小,聚氨酯的微相分离程度降低,相容性增加,氢键作用增强,自由体积增大,聚氨酯的有效阻尼(tanδ≥0.3)温域可达175℃(-60~115℃),为一种基于网络结构设计的新型聚氨酯阻尼材料。On the basis of network structure designing, dangling chains and elastic chains were introduced into prepolymers by using 2,4-toluene diisocyanate （TDI） to react with polyethylene glycol （mPEG） and polyesterglycol, respectively. Then a series of random polyurethane elastomers were prepared from prepolymers and crosslinker H201. Dynamic mechanical analyzer （DMA）, atomic force microscope （AFM） and positron annihilation lifetime spectroscopy （PALS） were used to characterize the relationship between the structure and properties of the material. The mechanism of wide damping temperature range of the material was fully discussed in terms of free volume, micro phase separation and hydrogen bonding interaction. The results show that, with higher R（n（-NCO）/n（OH）） value or higher content of the dangling chains, the degree of microphase separation would decrease, whereas the compatibility and hydrogen bonding interactions as well as the free volume would increase, resulting in a new type of polyurethane damping （tanδ≥0.3） materials with a effective damping temperature range up to 175 ℃（-60～115 ℃）.

关 键 词：自由体积 微相分离 悬挂链 聚氨酯 阻尼 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]