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2004•Journal of Zhengzhou Institute of TechnologyRequires access

Characterizing on the Structure of High Molecular Weight PAN Synthesized in DMSO/H_(2)O

Yanzhi Wang

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Abstract

High molecular weight PAN is obtained by the free-radical suspension copolymerization of itaconic acid (IA) and acrylonitrile(AN) which is carried out in DMSO/H_(2)O by using AIBN as initiator. The structure and properties of PAN polymers are characterized by various means, such as intrinsic viscosity measurements, fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), etc. Because of the inclusion of good solvent DMSO, the solution degree of AN in DMSO/H_(2)O is higher than that in water, the resultant copolymer pellets become porous and from soft bulk to solid grain with the decrease of DMSO content in DMSO/H_(2)O ratio. High molecular weight of P(AN-co-IA) copolymers have faster preoxidization and cyclization than that for PAN homopolymers at 220 ℃ resulted from the FT-IR study.

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What this paper is about

High molecular weight PAN is obtained by the free-radical suspension copolymerization of itaconic acid (IA) and acrylonitrile(AN) which is carried out in DMSO/H_(2)O by using AIBN as initiator. The structure and properties of PAN polymers are characterized by various means, such as intrinsic viscosity measurements, fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), etc. Because of the inclusion of good solvent DMSO, the solution degree of AN in DMSO/H_(2)O is higher than that in water, the resultant copolymer pellets become porous and from soft bulk to solid grain with the decrease of DMSO content in DMSO/H_(2)O ratio. High molecular weight of P(AN-co-IA) copolymers have faster preoxidization and cyclization than that for PAN homopolymers at 220 ℃ resulted from the FT-IR study.

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Available abstract

High molecular weight PAN is obtained by the free-radical suspension copolymerization of itaconic acid (IA) and acrylonitrile(AN) which is carried out in DMSO/H_(2)O by using AIBN as initiator. The structure and properties of PAN polymers are characterized by various means, such as intrinsic viscosity measurements, fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), etc. Because of the inclusion of good solvent DMSO, the solution degree of AN in DMSO/H_(2)O is higher than that in water, the resultant copolymer pellets become porous and from soft bulk to solid grain with the decrease of DMSO content in DMSO/H_(2)O ratio. High molecular weight of P(AN-co-IA) copolymers have faster preoxidization and cyclization than that for PAN homopolymers at 220 ℃ resulted from the FT-IR study.

Key concepts: Copolymer, Itaconic acid, Acrylonitrile, Polymer chemistry, Scanning electron microscope, Fourier transform infrared spectroscopy, Polymer, Intrinsic viscosity

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