CAJ | 학술논문

对单向拉伸聚丙烯（pp）微孔膜的横向方向进行二次拉伸后，利用SEM、DSC等方法研究横向拉伸后微孔膜的微观结构和物理性能，探讨微孔膜透气性、孔径分布等性能与拉伸程度的关系．结果表明，微孔膜经过二次横向拉伸后，微孔膜的MD方向未出现收缩，横向强度均有所提高；DSC曲线上低温平台区逐渐消失，结晶主熔融峰向高温方向移动．当拉伸比超过10％后，微孔膜的微孔分布和排列规整性变差，微孔孔径变大，片晶结构破坏严重，横向收缩明显增加．当横向拉伸为10％时，微孔膜有较好的微观结构，横向强度提高了2．33MPa，横向收缩率仅有2．1％，孔隙率和孔径增加，透气时间缩短．
대단향랍신취병희（pp）미공막적횡향방향진행이차랍신후，이용SEM、DSC등방법연구횡향랍신후미공막적미관결구화물이성능，탐토미공막투기성、공경분포등성능여랍신정도적관계．결과표명，미공막경과이차횡향랍신후，미공막적MD방향미출현수축，횡향강도균유소제고；DSC곡선상저온평태구축점소실，결정주용융봉향고온방향이동．당랍신비초과10％후，미공막적미공분포화배렬규정성변차，미공공경변대，편정결구파배엄중，횡향수축명현증가．당횡향랍신위10％시，미공막유교호적미관결구，횡향강도제고료2．33MPa，횡향수축솔부유2．1％，공극솔화공경증가，투기시간축단．
In this paper ,the microporous membrane was secondary stretched along the transverse direc-tion .The structure and properties of microporous membrane with different transverse stretching ratios were characterized by scanning electron microscope (SEM) ,differential scanning calorimetry (DSC) .The results showed that after the secondary stretching ,the shrinkage phenomenon along the machine direction disappeared and the transverse strength increased .With increasing the stretching ratios ,the endotherm plateau on the DSC curve disappeared and the melt point shifted to high temperature .When the stretching ratio was more than 10% ,the pore distribution and arrangement became worse and the lamellae structure damaged seriously .T he transverse shrinkage significantly increased .Only under the transverse stretching ratio of 10% ,the microporous membrane showed better structure .The transverse stress was improved by 2 .33MPa and the shrinkage percent was only 2 .1% .Meanwhile ,the membrane had the higher porosity and pore diameter .Gurley value was reduced obviously .