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


Thermal flexibility of aromatic polymide chains in solution from viscometric analysis
Authors:Peter N Lavrenko  Olga V Okatova
Abstract:Intrinsic viscosities of poly(p-phenylene terephthalamide) (PPTA) and poly(m-phenylene isophthalamide) (PMIA) samples of the same molecular weight are determined in 90%, 96% and 100% sulfuric acid at temperatures from 0 to 130°C. Conditions are established under which the degree of coiling of PPTA molecule is close to that for PMIA. Experimental data are compared with the results of theoretical calculations of the Kuhn segment length. In the light of this comparison, some quantitative characteristics of the deformational flexibility mechanism for aromatic polyamide chains and the hindrance to intramolecular rotation are discussed. © 1993 John Wiley & Sons, Inc.
Keywords:polyamide chains in solution  thermal flexibility of  intrinsic viscosity of poly(p-phenylene terephthalamide) and poly(m-phenylene isophthalamide) of equal molecular weights  temperature dependence of  flexibility mechanism for polyamide chains in solution
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