Microphase-separated structure and mechanical properties of norbornane diisocyanate-based polyurethanes
Microphase-separated structure and mechanical properties of norbornane diisocyanate-based polyurethanes
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DOI：
10.1016/j.polymer.2006.12.057
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发表时间：
2007-02-09
期刊：
影响因子：
4.6
通讯作者：
Furukawa, Mutsuhisa
中科院分区：
文献类型：
--
作者：
Kojio, Ken;Nakashima, Shohei;Furukawa, Mutsuhisa
降冰片二异氰酸酯(NBDI: 2,5（2,6)-双（异氰酸酯）双环[2.2.1]庚烷）是一种新型的商业化二异氰酸酯。以聚氧四亚甲基乙二醇（PTMG）、NBDI和1,4-丁二醇（BD）为原料，采用预聚法制备了NBDI基聚氨酯弹性体（PLJEs）。比较了nbdi基PUEs与一般脂肪族和环脂肪族二异氰酸酯基PUEs的微相分离结构和力学性能。所使用的二异氰酸酯有异虫酮二异氰酸酯（IPDI）、4,4′-二环己基甲烷二异氰酸酯（HMDI）和1,6-六亚甲基二异氰酸酯(M)。以各异氰酸酯和BD为原料制备常规聚氨酯硬段模型，了解各硬段链的特征。hdi基PUE的杨氏模量和抗拉强度在四种PUE中最大，这是由于硬段组分的结晶能力和最强的微相分离。与NBDI和IPDI相比，HMDI具有高度对称的化学结构，同时具有脂肪族和环脂肪族二异氰酸酯的性质。另一方面，基于NBDI和ipdi的PUEs倾向于相混合，导致杨氏模量和抗拉强度下降。由于NBDI的刚性结构，使得基于NBDI的PUE在高温下表现出更好的热性能。(c) 2007 Elsevier Ltd.版权所有。
Norbornane diisocyanate (NBDI: 2,5(2,6)-bis(isocyanatomethyl)bicyclo[2.2.1]heptane) is a new commercialized diisocyanate. NBDI-based polyurethane elastomers (PLJEs) were prepared from poly(oxytetramethylene) glycol (PTMG), NBDI and 1,4-butanediol (BD) by a prepolymer method. Microphase-separated structure and mechanical properties of the NBDI-based PUEs were compared with general aliphatic and cyclo-aliphatic diisocyanate-based PUEs. The diisocyanates used were isophorone diisocyanate (IPDI), 4,4'-dicyclohexylmethane diisocyanate (HMDI) and 1,6-hexamethylene diisocyanate (M). Regular polyurethanes were also prepared as hard segment models from each isocyanate and BD to understand the feature of each hard segment chain. The HDI-based PUE showed the largest Young's modulus and tensile strength in the four PUEs due to the ability of crystallization of the hard segment component and the strongest microphase separation. HMDI has both properties of aliphatic and cycloaliphatic diisocyanates because of its high symmetrical chemical structure compared with NBDI and IPDI. On the other hand, the NBDI- and IPDI-based PUEs have an inclination to phase mixing, leading to decreased Young's modulus and tensile strength. The NBDI-based PUE exhibited better thermal properties at high temperatures due to stiff structure of NBDI. (c) 2007 Elsevier Ltd. All rights reserved.