Chain Conformation and Local Rigidity of Soluble Polyimides(II): Isomerized Polyimides in THF

高等学校化学研究 ›› 2012, Vol. 28 ›› Issue (2): 329-333 .

Chain Conformation and Local Rigidity of Soluble Polyimides(II): Isomerized Polyimides in THF

LIU Gui-hua^1,3, QIU Xue-peng², BO Shu-qin¹, JI Xiang-ling¹

1. State Key Laboratory of Polymer Physics and Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
2. Polymer Composite and Engineering Laboratory,Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
3. Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China

收稿日期:2011-04-02 修回日期:2011-07-13 出版日期:2012-03-25 发布日期:2012-03-08
通讯作者: BO Shu-qin, JI Xiang-ling E-mail:xlji@ciac.jl.cn; sqbo@ciac.jl.cn
基金资助:
Supported by the National Natural Science Foundation of China(No.20674085), the Funds for Creative Researth Groups of China(No.50921062) and the Project of Bureau of Science and Technology of Jilin Province, China(No.20101535).

Chain Conformation and Local Rigidity of Soluble Polyimides(II): Isomerized Polyimides in THF

LIU Gui-hua^1,3, QIU Xue-peng², BO Shu-qin¹, JI Xiang-ling¹

1. State Key Laboratory of Polymer Physics and Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
2. Polymer Composite and Engineering Laboratory,Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
3. Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China

Received:2011-04-02 Revised:2011-07-13 Online:2012-03-25 Published:2012-03-08
Supported by:
Supported by the National Natural Science Foundation of China(No.20674085), the Funds for Creative Researth Groups of China(No.50921062) and the Project of Bureau of Science and Technology of Jilin Province, China(No.20101535).

摘要/Abstract

摘要： Two soluble isomerized polyimides(PIs) synthesized from 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropro- pane dianhydride(6FDA) with either 2,2′-dimethylbenzidine(2,2′-DMB) or 3,3′-DMB were investigated by means of size-exclusion chromatography coupled with multi-angle laser light scattering, a viscometer and a refractive index detector in tetrahydrofuran(THF) with tetrabutylammonium bromide(TBAB) at 35 °C. The corresponding parameters related to conformations α and ν, evaluated from the scaling relationships [η]=K_ηM^α and R_g=K_gM^ν, respectively, were 0.66±0.01 and 0.55±0.02 for poly(6FDA/3,3′-DMB), and 0.67±0.01 and 0.56±0.01 for poly(6FDA/2,2′-DMB), indicating a random coil conformation for both the samples in this mobile system. The persistence length l_p and shift factor M_L(relative molecular weight per unit contour length) were estimated from the relationship between intrinsic viscosity and molecular weight for the wormlike cylinder model proposed by Bohdanecky. Both l_p and M_L showed that the two PIs in THF are flexible chains and exhibit some local rigidity to some extent.

关键词: Isomerized polyimide, Chain conformation, Local rigidity, Wormlike chain, Persistence length

Abstract: Two soluble isomerized polyimides(PIs) synthesized from 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropro- pane dianhydride(6FDA) with either 2,2′-dimethylbenzidine(2,2′-DMB) or 3,3′-DMB were investigated by means of size-exclusion chromatography coupled with multi-angle laser light scattering, a viscometer and a refractive index detector in tetrahydrofuran(THF) with tetrabutylammonium bromide(TBAB) at 35 °C. The corresponding parameters related to conformations α and ν, evaluated from the scaling relationships [η]=K_ηM^α and R_g=K_gM^ν, respectively, were 0.66±0.01 and 0.55±0.02 for poly(6FDA/3,3′-DMB), and 0.67±0.01 and 0.56±0.01 for poly(6FDA/2,2′-DMB), indicating a random coil conformation for both the samples in this mobile system. The persistence length l_p and shift factor M_L(relative molecular weight per unit contour length) were estimated from the relationship between intrinsic viscosity and molecular weight for the wormlike cylinder model proposed by Bohdanecky. Both l_p and M_L showed that the two PIs in THF are flexible chains and exhibit some local rigidity to some extent.

Key words: Isomerized polyimide, Chain conformation, Local rigidity, Wormlike chain, Persistence length

LIU Gui-hua, QIU Xue-peng, BO Shu-qin, JI Xiang-ling. Chain Conformation and Local Rigidity of Soluble Polyimides(II): Isomerized Polyimides in THF[J]. 高等学校化学研究, 2012, 28(2): 329-333 .

LIU Gui-hua, QIU Xue-peng, BO Shu-qin, JI Xiang-ling. Chain Conformation and Local Rigidity of Soluble Polyimides(II): Isomerized Polyimides in THF[J]. Chemical Research in Chinese Universities, 2012, 28(2): 329-333 .

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Chain Conformation and Local Rigidity of Soluble Polyimides(II): Isomerized Polyimides in THF

Chain Conformation and Local Rigidity of Soluble Polyimides(II): Isomerized Polyimides in THF

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