材料期刊网

以端羟基聚丁二烯（HTPB）、环氧乙烷-四氢呋喃共聚醚（PET）以及聚叠氮缩水甘油醚（GAP）为粘合剂,多异氰酸酯（N100）、异佛尔酮二异氰酸酯（IPDI）为固化剂,三羟甲基丙烷（TMP）为交联剂,制备了PETS/PETL/N100、GAP/PETL/N100、GAP/PET/IPDI/TMP、GAP/HTPB/IPDI/TMP四种双模聚氨酯交联体系,研究了双模网络对聚氨酯弹性体力学性能的影响。结果表明,双模体系较之于短链单模体系,力学性能有了较大的改善。双模聚氨酯交联体系力学性能的提高主要是非仿射变形的结果,非仿射变形程度主要取决于交联点之间的氢键数。单组分固化反应速率的差异对双模体系的力学性能影响较大。

Using hydroxyl-terminated polybutadien(HTPB),oxide/tetrahydrofuran copolyether(PET) and glycidyl azide polymer(GAP) as binders,polyisocyanates(N100) and isophorone diisocyanate(IPDI) as curing agents,trimethylolpropan(TMP) as crossing agent,four types of bimodal polyurethane cross-linking systems including PETs/PETL/N100,GAP/PETL/N100,GAP/PET/IPDI/TMP and GAP/HTPB/IPDI/TMP were prepared.The effect of the bimodal network on the mechanical properties of polyurethane elastomer was investigated.The results show that the mechanical properties of bimodal systems are better than that of short-chain monomodal system.The improvement of mechanical properties of bimodal polyurethane cross-linking systems may be explained by nonaffine deformation,and the degree of nonaffine deformation in these bimodal systems may be influenced by the different degree of the hydrogen bonding.The mechanical properties of bimodal systems may be significantly affected by the difference of the curing rate between monomodal systems.