PET/纳米SiO2复合材料的制备(Ⅱ):纳米SiO2在PET中的分散性研究

研究了分散方法、纳米材料的加入体系、分散时间、分散剂的种类及SiO2 的加入量对纳米SiO2 在PET/纳米SiO2 中分散性的影响 ,用TEM对其分散情况进行表征 ,并对其分散机理进行探讨与研究。其结果表明 :采用球磨分散法并以氨基硅烷A1 1 2 0分散剂时分散效果最佳 ;当分散时间达 7 5h时 ,分散液中SiO2 基本以纳米尺寸存在 ;将分散液加入对苯二甲酸二甲酯熔体中并在球磨状态下进行酯交换SiO2 的分散效果最好 ,1 0 0nm以下的SiO2 达 95 0 7% ;体系中随SiO2 量的增加 ,其分散性变差 ,当纳米SiO2 的加入量为 1 %～ 4 %时 ,粒径在 1 0 0nm以下的SiO2 由 88%下降到 61 %。

Preparation of PET/nano-SiO2 composite (Ⅱ):Study on the dispersivity of nano-SiO2 in PET

Effects of dispersion methods,dispersion matrix,types of dispersants, dispersion time and the adding amounts of SiO 2 on the dispersitivity of nona SiO 2 in PET were studied.The dispersivity of nano SiO 2 was characterized by using TEM and the dispersion mechanism.Results show that the best dispersion effects can be obtained by using ball grinding dispersion method with A1120 as dispersant and SiO 2 exists as nano size in dispersion liquor for 7 5 h.Results shows that the addition of diethyl terephthalate melt in the dispersion liquor and ester exchage made in ball grinding will produce best dispersion results of SiO 2,possibly reaching 95 07% with SiO 2 under 100 nm,but with the increasing of SiO 2 in amount from 1% to 4%,nano SiO 2 with diameter under 100 nm in PET will decrease from 88% to 61%.