高校化学工程学报2026，Vol.40Issue(2)：226-231,6.DOI:10.3969/j.issn.1003-9015.2025.00.039
单活性位点异氰酸酯活化剂对己内酰胺阴离子聚合的影响
Effect of monofunctional isocyanate activator on the anionic polymerization of caprolactam
摘要
Abstract
Isocyanate compounds are highly effective activators for anionic polymerization of caprolactam(CL),but often lead to crosslinking reactions due to their dual active sites.To prevent this,monofunctional p-toluene isocyanate(p-Ti)as an activator with sodium hydride(NaH)catalyst was used to study the anionic ring-opening polymerization behavior of CL.The p-Ti reacted completely with CL to form acyl lactam active centers,resulting in a reaction system devoid of free isocyanate groups,which effectively suppressed crosslinking reactions,and the molecular weight of the polymerization product cloud be controlled by the amount of p-Ti.In addition,at 150℃,the NaH concentration had no effect on the relative viscosity of the product.However,at 180℃,as the NaH mole fractio n rose from 1%to 4%,the relative viscosity of the polymerization product increased from 2.5 to 3.0.This is due to the deprotonation of the active center by NaH at high temperatures,resulting in the formation of acyl lactam anions.This causes a decrease in their nucleophilicity,a reduction in active centers,an increase in the molecular chain length of the polymer product,and an increase in relative viscosity.Changing the feeding sequence to prioritize the consumption of NaH,or using N-acetylcaprolactam(N-AcL)activator that does not react with NaH can reduce side reaction,resulting in that the relative viscosity of the product does not change with increasing NaH concentration.关键词
己内酰胺/阴离子聚合/对甲苯异氰酸酯/氢化钠/N-乙酰基己内酰胺Key words
caprolactam/anionic polymerization/p-tolyl isocyanate/NaH/N-acetyl caprolactam分类
化学化工引用本文复制引用
任鹏昊,李钿钿,蒋明哲,段金汤,顾雪萍,冯连芳,张才亮..单活性位点异氰酸酯活化剂对己内酰胺阴离子聚合的影响[J].高校化学工程学报,2026,40(2):226-231,6.基金项目
国家自然科学基金(52273043)和浙江大学衢州研究院培育(IZQ2024KJ0001). （52273043）
