STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS

G. Santhana Krishnan; A. Burkanudeen; N. Murali; Hemant Phadnis

doi:10.1007/s10118-012-1163-x

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STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS

PAPER | Updated：2023-01-03

- STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS
- STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS
- Chinese Journal of Polymer Science 2012年30卷第5期页码：664-673
- Affiliations：
  
  a.Materials Science Division, CSIR, National Aerospace Laboratories, Bangalore-560017, India
  b.Post Graduate and Research Department of Chemistry, Jamal Mohammed College, Bharathidasan University, Tiruchirappalli, India
  c.Malvern Application Laboratory, Naimex House, Bangalore-560045, India
- Author bio：
  
  **G. Santhana Krishnan, E-mail: santhana@nal.res.in
- Funds：
  
  Council of Scientific and Industrial Research, New Delhi under Supra Institutional Project(SIP-IFCAP-04)
- DOI：10.1007/s10118-012-1163-x
  中图分类号：
- 收稿：2011-10-31，
  
  修回：2012-01-17，
  
  录用：2012-02-14，
  
  纸质出版：2012-09
- Accepted：
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G. Santhana Krishnan, A. Burkanudeen, N. Murali, 等. STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS[J]. Chinese Journal of Polymer Science, 2012,30(5):664-673.

G. Santhana Krishnan, A. Burkanudeen, N. Murali, et al. STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS[J]. Chinese Journal of Polymer Science, 2012, 30(5): 664-673.
G. Santhana Krishnan, A. Burkanudeen, N. Murali, 等. STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS[J]. Chinese Journal of Polymer Science, 2012,30(5):664-673. DOI： 10.1007/s10118-012-1163-x.

G. Santhana Krishnan, A. Burkanudeen, N. Murali, et al. STUDIES ON MOLECULAR WEIGHT DISTRIBUTION OF CARBON FIBER POLYMER PRECURSORS SYNTHESIZED USING MIXED SOLVENTS[J]. Chinese Journal of Polymer Science, 2012, 30(5): 664-673. DOI： 10.1007/s10118-012-1163-x.

摘要

Abstract

The molecular weight distributions were estimated for carbon fiber polymer precursors such as poly(acrylonitrile-

- itaconic acid) synthesized by semi batch solution polymerization in mixed solvents media with the azonitrile compounds as initiator under the different ratios of solvent and non solvent from 0.75 to 2.5 in weight. The copolymer was characterized by using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (1H-NMR) analyses. The molecular weight distributions were evaluated by

ratios estimated from viscosity and osmotic measurements

and

estimated from size exclusion chromatography. The molecular weight distributions of these polymers as determined from

and

are 2.9 to 3.2 and 2.0 to 2.5 respectively. The molecular distributions were close to a narrow distribution of 2.0 when the solvent/non-solvent ratio was varied between 1.4 and 2.0. Intrinsic viscosity [

] as a function of molecular weight of poly(acrylonitrile-co-itaconic acid) was evaluated by means of low angle laser light scattering with size exclusion chromatography (SEC-LALLS) and viscometry with SEC (SEC-VISCO). The relationship between [

] and

for poly(acrylonitrile-co-itaconic acid) in DMF at 50℃ was [

] = 1.1 × 10

-5

0.79

where [

] is obtained in dL/g.

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