以聚碳酸酯二元醇(PCDL)结合聚四氢呋喃(PTMG)为软段,以异佛尔酮二异氰酸酯(IPDI)为硬段,以N-(2-氨乙基)-2-氨基乙烷磺酸钠(AAS)为亲水单体,采用丙酮法制备了固含量在50％以上的高性能、高固含量聚氨酯分散体( PUDs).结果表明,随着亲水基团含量(HGC)的增加,PUD胶粒平均粒径变小,黏度增加；随着n(PCDL)∶n(PTMG)的减小和n(-NCO)∶n(-OH)(R值)的增加,PUD胶粒平均粒径变大,黏度减小.粒径分布随着亲水基团含量的增加而变窄,随着n(PCDL)∶n(PTMG)的减小和R值的增加而变宽.TEM显示在亲水基团较多时,聚氨酯分散体胶粒呈规则的球形结构,随着亲水基团含量的增加,胶粒的尺寸减小,且形状不规则的胶粒逐渐减少.力学性能测试显示PUD胶膜具有优良的机械性能,拉伸强度高达40 MPa,断裂伸长率可达1 700％.动态力学分析表征显示,PUD胶膜的玻璃化转变温度(Tg)随着PCDL含量减少而降低.
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