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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).

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【作者】 杨云松彭红云戚国荣

【Author】 YANG Yun-song, PENG Hong-yun, QI Guo-rong(1.Institute of Polymer Science and Materials, Zhejiang University, Hangzhou 310027, China; 2. Department of Natural Resources Science, Zhejiang University, Hangzhou 310029, China)

【机构】 浙江大学高分子材料研究所浙江大学资源科学系浙江大学高分子材料研究所 浙江杭州310027浙江杭州310029浙江杭州310027

【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.

【Abstract】 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

【基金】 国家自然科学基金资助项目(59073123).
  • 【文献出处】 浙江大学学报(理学版) ,Journal of Zhejiang University(Sciences Edition) , 编辑部邮箱 ,2003年05期
  • 【分类号】O631
  • 【被引频次】7
  • 【下载频次】168
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