以三羟甲基丙烷(TMP)为内交联剂,合成了一种内交联的水性聚氨酯(WPU)预聚体,以KH550为偶联剂,加入亲水型纳米二氧化硅(A200),通过溶胶-凝胶过程合成了一种水性聚氨酯/纳米二氧化硅杂化材料(PUSi).通过红外光谱(FT-IR)、热重分析(TG)和透射电镜(TEM)等测试对PUSi的结构和性能进行了研究,并研究了纳米SiO2对PUSi杂化乳液粒径、形貌及PUS胶膜力学性能、耐热性、耐水、耐介质性的影响.红外分析表明,WPU大分子和A200之间形成了化学键,溶胶-凝胶过程中形成了Si-O-Si结构.TG分析表明,A200的加入提高了材料的耐热性.当w(A200)由0%增至2.5%时,乳液粒径由80.3 nm增至152.1 nm,膜的拉伸强度由8.5 MPa增加到23.6 MPa,耐水性能得到提高,硬度亦相应提高.
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