采用化学沉淀法制备了纳米SiO2,并用硅烷偶联剂KH550对其进行原位改性,以N,N-二甲基甲酰铵为溶剂,采用溶液共混法制备了EVOH/纳米SiO2复合材料,并吹塑成薄膜.对纳米SiO2和复合材料进行了表征.结果表明,化学沉淀法制备的纳米SiO2为球形,粒径约20nm,原位改性效果良好.溶液共混法制备EVOH/纳米SiO2复合材料,纳米SiO2在EVOH中的分散性较好,EVOH/纳米SiO2(5%(质量分数)SiO2,KH550改性)复合材料相较于纯EVOH,拉伸强度提高96.3%,透湿、透气系数分别下降35.9%、51.1%,透光率达到75.6%,雾度为12.74%.
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