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Effect of Diisocyanate on Pyridine Containing Shape Memory Polyurethanes Based on N,N-Bis(2-hydroxylethyl)isonicotinamide

机译:二异氰酸酯对基于N,N-双(2-羟乙基)异烟酰胺的吡啶类形状记忆聚氨酯的影响

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摘要

This article demonstrates a comparative investigation about the effect of diisocyanate on pyridine containing shape memory polyurethanes (Py-SMPUs), which are synthesized with N,N-bis(2-hydroxylethyl)isonicotinamide (BINA) and four different diisocyanates: 1,6-hexanediisocyante (HDI), isophorone diisocyanate (IPDI), methylene diphenyl diisocyanate (MDI), and tolylene diisocyanate (TDI). Results show that all BINA–SMPU systems have amorphous reversible phase. Comparatively, the MDI–BINA and TDI–BINA systems show higher T_g; and the HDI–BINA and IPDI–BINA systems show better thermal stability. In addition, the HDI– BINA and the IPDI–BINA systems exhibit good thermal-induced shape memory effect and good moisture-sensitive shape memory effect due to their better moisture absorption properties. Particularly, the HDI–BINA system has better response speed and better shape recovery.
机译:本文展示了有关二异氰酸酯对含吡啶的形状记忆聚氨酯(Py-SMPU)的作用的比较研究,该聚氨酯由N,N-双(2-羟乙基)异烟酰胺(BINA)和四种不同的二异氰酸酯合成:1,6-己二异氰酸酯(HDI),异佛尔酮二异氰酸酯(IPDI),亚甲基二苯基二异氰酸酯(MDI)和甲苯二异氰酸酯(TDI)。结果表明,所有BINA–SMPU系统均具有非晶可逆相。相比之下,MDI–BINA和TDI–BINA系统显示出更高的T_g; HDI–BINA和IPDI–BINA系统显示出更好的热稳定性。此外,HDI–BINA和IPDI–BINA系统由于具有更好的吸湿性能,因此具有良好的热感应形状记忆效果和良好的湿敏形状记忆效果。特别是,HDI-BINA系统具有更好的响应速度和更好的形状恢复能力。

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