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
zhangensong@fudan.edu.cn (E.S.Z.)
xlji@ciac.ac.cn (X.L.J.)
收稿:2019-08-23,
修回:2019-9-12,
录用:2019-9-16,
网络首发:2019-11-18,
纸质出版:2020-06
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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.
Eight 6FDA-TFDB polyimide (PI) samples with absolute molecular weights ranging from 1.25 × 10
5
g·mol
–1
to 3.11 × 10
5
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
N
N
′-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
η
sp
versus
ϕ
/
ϕ
η
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.
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