Molecular Weight Dependence of Associative Behavior in Polyimide/DMF Solutions

Hong-Xiang Chen; En-Song Zhang; Mei Hong; Wei Liu; Xue-Min Dai; Quan Chen; Xue-Peng Qiu; Xiang-Ling Ji

doi:10.1007/s10118-020-2358-1

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Molecular Weight Dependence of Associative Behavior in Polyimide/DMF Solutions

ARTICLE | Updated：2019-11-18

- Molecular Weight Dependence of Associative Behavior in Polyimide/DMF Solutions
- Chinese Journal of Polymer Science Vol. 38, Issue 6, Pages: 629-637(2020)
- Affiliations：
  
  a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  b.School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, China
  c.Laboratory of Polymer Composites and Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Author bio：
  
  zhangensong@fudan.edu.cn (E.S.Z.)
  xlji@ciac.ac.cn (X.L.J.)
- Funds：
- DOI：10.1007/s10118-020-2358-1
  CLC： M
- Received：23 August 2019，
  
  Revised：2019-9-12，
  
  Accepted：16 September 2019，
  
  Online First：18 November 2019，
  
  Published：2020-06
- Accepted：
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Chen, H. X.; Zhang, E. S.; Hong, M.; Liu, W.; Dai, X. M.; Chen, Q.; Qiu, X. P.; Ji, X. L. Molecular weight dependence of associative behavior in polyimide/DMF solutions. Chinese J. Polym. Sci. 2020, 38, 629–637

Hong-Xiang Chen, En-Song Zhang, Mei Hong, et al. Molecular Weight Dependence of Associative Behavior in Polyimide/DMF Solutions[J]. Chinese Journal of Polymer Science, 2020, 38(6): 629-637.
Chen, H. X.; Zhang, E. S.; Hong, M.; Liu, W.; Dai, X. M.; Chen, Q.; Qiu, X. P.; Ji, X. L. Molecular weight dependence of associative behavior in polyimide/DMF solutions. Chinese J. Polym. Sci. 2020, 38, 629–637 DOI： 10.1007/s10118-020-2358-1.

Hong-Xiang Chen, En-Song Zhang, Mei Hong, et al. Molecular Weight Dependence of Associative Behavior in Polyimide/DMF Solutions[J]. Chinese Journal of Polymer Science, 2020, 38(6): 629-637. DOI： 10.1007/s10118-020-2358-1.

摘要

Abstract

Eight 6FDA-TFDB polyimide (PI) samples with absolute molecular weights ranging from 1.25 × 10

g·mol

–1

to 3.11 × 10

g·mol

–1

are obtained by precipitation fractionation. Rheological experiments are conducted to determine the influence of molecular weight on the associating behavior of PI in

′-dimethylformamide (DMF) solutions in a broad volume fraction

including abnormal steady shear flow

solution heterogeneity

and scaling behavior. Abnormal flow behaviors

i.e.

multi-region shear thinning and weak shear thickening

are studied

and these behaviors have not been reported in literature. The heterogeneity of PI/DMF solutions is examined by dynamic rheological test. By plotting

versus

four concentration regions of I–IV can be distinguished for all PI samples with various molecular weights. The scaling results in different concentration regions are in good agreement with the associative polymer theory proposed by Rubinstein and Semenov. The scaling exponents do not show molecular weight dependence in concentration regions I and II. In concentration regions III and IV

the scaling exponents change little when the molecular weight is below 242 k but increase when the molecular weight increases from 242 k to 311 k. This work can help us to understand polyimide solution properties from dilute to semidilute entangled solutions

and will guide the polyimide solution preparation for different processing.

关键词

Keywords

references

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