【摘要】 <正> 嵌段聚醚聚氨酯类由于其优良的机械性能和生物相容性,在植入体内的医用材料方面受到了广泛重视。美国Ethicon公司推荐的产品Biomer也属于这一类,它们一般结构如下:更多还原

【Abstract】 We have investigated the synthetic methods of segmented polyether polyurethane (PEU) through polytetramethylene glycol-4, 4’-diphenyhnethane diisocyanate (PTMG-MDI) prepolymer with ethylene diamine (ED) as extender and observed that different methods of adding reagents in the two-stops solution polymerization -will result in the formation of two-phase components block copolymers with different morphology and somewhat different physical properties. Method A, adding PTMG solution to MDI then adding extender to the resulted prepolymer solution will always show better phase separation and give crystal herd domain in the size of 50-80 A, while method B usually give amorphous hard domain with much larger size of 1000-=2000 A.更多还原