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Issue 6, 2012
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Eco-friendly synthesis of carbon fiber precursor polymers and their molecular characteristics

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Abstract

Carbon fiber precursor polymers such as poly[acrylonitrile-co-itaconic acid], poly[acrylonitrile-co-acrylamide] copolymers were synthesized through green chemistry routes i.e., via solid phase polymerization without using solvents, employing aqueous soluble inorganic metal salts as template compounds. The composition and the average molecular weights, such as the number average molecular weight (Mn), viscosity average molecular weight (Mv), weight average molecular weight (Mw) and size average molecular weight (Mz), were determined. The molecular weight distributions were evaluated by the Mv : Mn ratios estimated from the viscosity and osmotic measurements, and the Mw/Mn values were estimated from size exclusion chromatography (SEC-LALLS). The molecular weight distributions of these polymers, as determined from Mv/Mn and Mw/Mn, were 2.1 to 3.2 and 2.1 to 2.5 respectively. The molecular parameters [Mn (4.7 × 104), Mv (1.64 × 105), Mw (1.17 × 105) g mol−1] are comparable to those obtained through suspension [Mn (4.25 × 104), Mv (2.09 × 105), Mw(1.82 × 105) g mol−1] and solution [Mn (4.28 × 104), Mv (1.61 × 105), Mw(1.43 × 105) g mol−1] polymerization processes (conventional). The dispersity of the polymer spinning solution was also investigated using a parallel plate viscometer which confirms the homogeneity of the solution.

Graphical abstract: Eco-friendly synthesis of carbon fiber precursor polymers and their molecular characteristics

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Publication details

The article was received on 20 Jan 2012, accepted on 05 Apr 2012 and first published on 05 Apr 2012


Article type: Paper
DOI: 10.1039/C2GC35098J
Citation: Green Chem., 2012,14, 1778-1785
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    Eco-friendly synthesis of carbon fiber precursor polymers and their molecular characteristics

    G. S. Krishnan, A. Burkanudeen, N. Murali and H. Phadnis, Green Chem., 2012, 14, 1778
    DOI: 10.1039/C2GC35098J

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