聚对苯二甲酸丁二醇酯-层状硅酸盐纳米复合材料的制备与性能

Preparation, nucleation and properties of poly (butylene terepht-halate)-layered silicate nanocomposites

制备了聚对苯二甲酸丁二醇酯-层状硅酸盐(LS)纳米复合材料(NPBT),并研究了它的结晶特性。LS的剥离片层起结晶成核中心作用并阻碍PBT球晶生长。LS的质量分数为1.0％～10.0％时,NPBT的热变形温度比纯PBT提高30～50℃,结晶速率(1/t_1/2)比PBT提高约30％～100％,加工注模温度显著下降,热降解性能变好。TEM观测表明:NPBT中LS片层的尺度为30～100 nm;3％的粒子发生团聚并与基体相分离。选择适当的处理剂、控制LS加入量和加入方式可减少发生团聚的粒子。

Poly(butylene terephthalate)-layered silicate (LS) nanocomposites (NPBT) were prepared, and their crystallization, nucleation and their structure-properties were investigated. LS exfoliated layers form many nucleation centers preventing spherulitic from growth. NPBT's HDT is enhanced from 30 to 50℃, its modulus increases greatly, its crystallization rate (1/t1/2) is further enhanced 30%-100%, and its injection mould processing temperature is dramatically lowered compared with pure PBT for LS load from 1.0% to 10.0%. In NPBT, the average particle size of LS is from 30 to 100 nm with 3% of micron-sized agglomerations, which are phase separated from PBT matrix by TEM. The agglomerated particles can be reduced by the selection of proper treating reagent, control of LS load and the way of loading LS.