聚丙烯酸长链酯的Huggins常数与其分子量的依赖性关系  

Huggins constant-molecular weight relationship for poly(n-behenyl acrylate) and poly (n-octadecyl acrylate).

作　　者：杨云松[1] 彭红云[2] 戚国荣[1] 

机构地区：[1]浙江大学高分子材料研究所,浙江杭州310027 [2]浙江大学资源科学系,浙江杭州310029

出　　处：《浙江大学学报（理学版）》2003年第5期545-549,553,共6页Journal of Zhejiang University（Science Edition）

基　　金：国家自然科学基金资助项目(59073123).

摘　　要：聚丙烯酸高碳醇酯(PBA)及聚丙烯酸十八醇酯(POA)是具有长烷基侧链的梳状聚合物,在溶剂苯中的Huggins常数(k′)随其分子量(M)的变化而变化.在PBA-苯体系中发现,当M低于某一临界分子量(MLC)时,k′随分子量的降低显著增大;当M大于某临界分子量(MHC)时,k′随分子量的升高而增大;当M在MLC～MHC时,k′基本上保持不变.而在POA-苯体系中发现,当M低于某一临界分子量(MC)时,k′随分子量的降低显著增大;当M大于该临界分子量(MC)时,k′在0.33～0.43变化.文中同时给出了精确算法用来计算PBA-苯体系及POA-苯体系中PBA及POA的特性粘度.当k′>0.758时,用稀释外推法计算;当0.758>k′>0.426时,用一点法公式[η]=ηsp/Cηr计算;当0.426>k′>0.334时,用另一一点法公式[η]=2(ηsp-lnηr)/C计算.The Huggins constants ( k′ ) of poly ( n - behenyl acrylate) and poly ( n - octadecyl acrylate) in benzene are related to their molecular weight ( M ). In the poly ( n - behenyl acrylate)- benzene solution system, when goes up evidently with the decrease of molecular weight of poly ( n - behenly acrylate); when is a constant; when ascends with the increase of molecular weight of poly ( n - behenyl acrylate). And in the poly ( n - ctadecyl acrylate)- benzene solution system, when goes up evidently with the decrease of molecular weight of poly ( n-octadecyl acrylate); when value is kept from 0.33 to 0.43. Also, the equations of calculating accurate intrinsic viscosity of poly ( n - behenyl acrylate) and poly ( n- octadecyl acrylate) in benzene were given. One- point equation can be used to get accurate value of intrinsic viscosity for , whereas another one point equation can be used to get accurate value of intrinsic viscosity for

关 键 词：聚丙烯酸长链酯 Huggins常数 分子量 特性粘度 聚丙烯酸高碳醇酯 聚丙烯酸十八醇酯 依赖性关系 

分 类 号：O632.52[理学—高分子化学] O631.61[理学—化学]