振磨降解制备的低分子量聚氯乙烯形态结构的研究

本文首次通过ＦＴＩＲ和扫描电镜等手段研究了振磨作用对聚氯乙烯（ＰＶＣ）颗粒尺寸、微晶结构、表现密度和增塑剂吸收量的影响。结果表明，该聚合物位于６３５ｃｍ＾－１处结晶吸收谱带的强度随振磨时间的增加而降低，逐步趋于消失。随振磨时间的增加，ＰＶＣ的颗粒尺寸减小，比表面积增加，增塑剂的吸收量增加。通过振磨可以制得用一般化学方法难于制得的超细、低微量含量、易于加工的较低分子量ＰＶＣ。

Studies on Morphological Structure of Low Molecular Weight PVC Prepared by Vibro-Milling Degradation

The effect of vibro-milling on particle size,crystalline structure,optical density and the plasticizer absorption of PVC were studied through FTIR,SEM and physical property tests.The experimental results show that the intensities of crystalline absorption bands on FTIR spectra at 635 cm(-1),604(-1) and 1427 cm(-1) get weaker and the intensities of 635 cm(-1) and 604 cm(-1) bands tend to disappear during vibro-milling,while the intensity of the amorphous absorption band at 1435 cm(-1) becomes stronger,indicating that the crystalline structure of PVC is changed somewhat and the crystallinity of PVC decreases during vibro-milling.The particle size and the molecular weight of PVC are decreased.The surface area and the amount of plasticizer absorption increase with the increase of vibro-milling time.The low molecular weight PVC so prepared has ultra-fine particle size,lower crystallinity and glass transition temperature,higher plasticizer absorption capacity,should have pretty good processability.