聚苯硫醚/羟基改性多壁碳纳米管复合材料等温结晶动力学的研究

Isothermal Crystallization Kinetics Study of PPS/MWCNTs-OH Composites

用差示扫描量热法（DSC）研究了，聚苯硫醚（PPS）／羟基多壁碳纳米管（MWCNTs—OH）复合材料的等温结晶过程，用Avrami方程考察了相关的结晶动力学参数。结果表明，各体系的Avrami指数均大于4，说明少量MWC—NTs—OH（1％～2％）不会改变PPS均相成核的成核方式，但MWCNTs—OH的加入使PPS结晶速率常数增大，体系结晶速率加快。MWCNTs—OH添加量相同时，结晶温度越低，MWCNTs-OH对结晶速率的影响越明显。FTIR分析结果表明，PPS中对位苯撑取代（S—Ar—S）振动峰发生明显位移，表明MWCNTs—OH与PPS间存在较强的分子间作用力。

Isothermal crystallization process of polyphenylene sulfide （PPS） /multi-walled carbon nanotubes （MWCNTs-OH） composites were investigated by DSC. The crystallization kinetics parameters was analyzed by the Avrami equation. The results showed that Avrami index n was always over 4 （ n ≥4） , which demonstrated that MWCNTs-OH （ 1% - 2% ） did not change the homogeneous nucleation model of PPS. But the crystallization rate constant of PPS increased when 1 -2 wt% MWCNTs-OH was added into PPS. With same concentration of MWCNTs-OH, the lower the crystallization temperature was, the obviously the crystallization rate would be. FTIR results indicated that characteristic absorption peak of S--Ar--S was sharply shifted with the addition of MWCNTs-OH. It showed that there must be some strong intermolecular forces between MWCNTs-OH and PPS.