【摘要】 在研究快速固化医用聚氨酯材料中 ,制备了以脂肪族多元醇为主的混合扩链剂 (NB)。以芳香二胺MOCA为主的商品扩链剂 (MB)作参照物 ,用红外光谱和凝胶色谱分别对NB和MB与聚醚型聚氨酯预聚体的反应过程进行了跟踪分析 ,并研究了各自所生成的聚氨酯材料N PU和M PU的性能。结果表明 :N PU中的异氰酸根反应较M PU更彻底 ,而N PU的平均分子量远大于M PU。二体系反应的固化时间基本相同 ,且NB体系具有较好的初期流动性 ,将有利于临床操作。N PU与M PU材料分别呈现“C”型和反“S”型应力 应变特性 ,N PU的蠕变特性不太明显且硬度较小。两种材料的环境适用性基本相同。因而NB将可望取代传统的MB。更多还原

【Abstract】 Based on aliphatic alcohol, alcohol amine and amine, a new mixed expander (NB) for polyurethane prepolymer was prepared. This expander is very useful for rapid solidification medical polyurethane materials without carcinogenic ingredient. Taking a commercially available expander(MB), which is mainly composed of 4,4’\|methylene\|bis(2\|chloroaniline)(MOCA), as a reference, the reactions of the both expanders and polyether\|based polyurethane prepolymer were traced by IR and GPC. Both systems showed similar solidification time, but the material based on NB, or N\|PU, have a better initial fluidity, which is convenient for clinical operation. The reactive degree of isocyanate groups is higher in N\|PU than in M\|PU(material based on MB). The average molecular weight of N\|PU is much higher than that of M\|PU. The stress\|strain curves of the material of N\|PU and M\|PU behaved like “C” and reverse “S” type respectively. N\|PU does not show obvious creeping phenomenon and is less rigid. Environmental adaptability of both materials is the same. Therefore, NB is suggested to be a substitute for MB.更多还原