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2000•Acta Polymerica SinicaRequires access

EFFECT OF ITACONIC ACID ON THE STRUCTURE AND PROPERTIES OF PAN PRECURSOR

Wangxi Zhang

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Abstract

Free\|radical solution copolymerization of itaconic acid (IA) and acrylonitrile (AN) was carried out in DMSO at 60℃ using azodiisobutyronitrile (AIBN) as initiator.The resulting polymerization solution was spun to form PAN precursors of carbon fibers,which were then characterized by elemental analysis,IR, 13 C\|NMR, DSC and so on.The effect of the itaconic acid content in copolymers on the structure and properties of PAN precursors was investigated.The comonmer content in the copolymer was analyzed quantitatively by IR.The adequate feed ratio of AN/IA was found to be 98/2 (W/W). Copolymers having about 2 mol% of comonomer appeared to have higher isotacticity as calculated from methine group signals in the 13 C\|NMR spectra.Furthermore,in the case of P (AN\|co\|IA) copolymers,the cyclization may start at a lower temperature and propagate at a slower rate.

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What this paper is about

Free\|radical solution copolymerization of itaconic acid (IA) and acrylonitrile (AN) was carried out in DMSO at 60℃ using azodiisobutyronitrile (AIBN) as initiator.The resulting polymerization solution was spun to form PAN precursors of carbon fibers,which were then characterized by elemental analysis,IR, 13 C\|NMR, DSC and so on.The effect of the itaconic acid content in copolymers on the structure and properties of PAN precursors was investigated.The comonmer content in the copolymer was analyzed quantitatively by IR.The adequate feed ratio of AN/IA was found to be 98/2 (W/W). Copolymers having about 2 mol% of comonomer appeared to have higher isotacticity as calculated from methine group signals in the 13 C\|NMR spectra.Furthermore,in the case of P (AN\|co\|IA) copolymers,the cyclization may start at a lower temperature and propagate at a slower rate.

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Available abstract

Free\|radical solution copolymerization of itaconic acid (IA) and acrylonitrile (AN) was carried out in DMSO at 60℃ using azodiisobutyronitrile (AIBN) as initiator.The resulting polymerization solution was spun to form PAN precursors of carbon fibers,which were then characterized by elemental analysis,IR, 13 C\|NMR, DSC and so on.The effect of the itaconic acid content in copolymers on the structure and properties of PAN precursors was investigated.The comonmer content in the copolymer was analyzed quantitatively by IR.The adequate feed ratio of AN/IA was found to be 98/2 (W/W). Copolymers having about 2 mol% of comonomer appeared to have higher isotacticity as calculated from methine group signals in the 13 C\|NMR spectra.Furthermore,in the case of P (AN\|co\|IA) copolymers,the cyclization may start at a lower temperature and propagate at a slower rate.

Key concepts: Itaconic acid, Comonomer, Acrylonitrile, Copolymer, Polyacrylonitrile, Polymer chemistry, Polymerization, Carbon-13 NMR

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EFFECT OF ITACONIC ACID ON THE STRUCTURE AND PROPERTIES OF PAN PRECURSOR — Research Paper | ScholarLens