首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Dilation of polycarbonate by carbon dioxide
Authors:Michael D Sefcik
Abstract:A new technique is described for dilatometry under high pressure. The technique is based on optical interferometry and is analogous to measuring the thickness of thin, nonabsorbing films and coatings. The procedure is demonstrated for the well-characterized system of n-pentane sorption by polyisobutylene, and then results for the dilation of polycarbonate by the sorption of carbon dioxide are presented. The dilation of polycarbonate by CO2 is nearly linear with concentration; the partial molar volume of CO2 decreases slightly with increasing pressure. This result indicates that all sorbed CO2 molecules contribute equally to the dilation of the polymer matrix and that none reside in microvoids or in preexisting free-volume elements which do not contribute to volume expansion of the polymer.
Keywords:
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号