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- Title
Influence of molecular weight on scaling exponents and critical concentrations of one soluble 6FDA-TFDB polyimide in solution.
- Authors
Zhang, Ensong; Chen, Hongxiang; Dai, Xuemin; Liu, Xue; Yang, Wenke; Liu, Wei; Dong, Zhixin; Qiu, Xuepeng; Ji, Xiangling
- Abstract
Polyimde (PI) samples with different molecular weights were synthesized. Based on SEC coupled with multidetectors measurement and Yamakawa-Fujii-Yoshizaki (YFY) model, eight soluble samples with absolute M from 40,600 g/mol to 197,000 g/mol are chosen and applied to investigate the influence of molecular weight on scaling exponents and critical concentrations at 20-45 °C in dilute, semidilute unentangled, and semidilute entangled solutions. Most of the scaling exponents are higher than the theoretical values in three concentration regions, and scaling exponent increases with molecular weight; overlap concentration (C*) increases and entanglement concentration (C) decreases with molecular weight. Considering bead-bead interaction, corrected bead-spring model can explain the related results. Finally, the relationship among C, C, and molecular weight is established at different temperatures (from 20 °C to 45 °C), and two linear equations are available at each temperature. Thus, both C and C are calculated at a fixed molecular weight. And from C/C and C/C ratios, the morphology of PI fiber during electrospinning can be controlled. These results are helpful to guide the preparation of polyimide solutions for different processing.
- Subjects
POLYIMIDES; MOLECULAR weights; SOLUTION (Chemistry); TEMPERATURE effect; ELECTROSPINNING
- Publication
Journal of Polymer Research, 2017, Vol 24, Issue 3, p1
- ISSN
1022-9760
- Publication type
Article
- DOI
10.1007/s10965-017-1204-9