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Poly(Acrylonitrile-EPDM-4-Chlorostyrene)과 스티렌공중합체의 합성과 열분해에 관한 연구

Synthesis and Thermal Degradation of Poly(Acrylonitrile-EPDM-4-Chlorostyrene) and Styrene Copolymers

김동건 신봉섭 하창식 설수덕

Kim DK Shin BS Ha CS Seul SD

HWAHAK KONGHAK, December 1992, 30(6), 649-656(8), NONE

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Abstract

Ethylene-propylene-diene terpolymer(EPDM)에 대한 4-chlorostyrene과 acrylonitrile의 그라프트 공중합은 반응온도 70℃에서 benzoyl peroxide(BPO)를 개시제로 사용하여 합성하였다. Poly(acrylonitrile-EPDM-4-chlo- rostyrene)(AECS)의 그라프트효율은 tetrahydrofuran(THF)을 용제로 사용했을 때가 가장 좋았고, 그 효율은 76%이었다. AECS의 내열, 난연, 내광 및 내후성을 Poly(acrylonitrile-butadiene-styrene)(ABS), Poly(α-methyl- styrene-acrylonitrile)(α-SAN), Poly(acrylonitrile-EPDM-styrene)(AES)와 비교하였다. 열중량법(TGA)과 시차주사열량법(DSC)에 의한 열분해의 활성에너지 값은 AECS(49-51Kcal/mol)>AES(46-50Kcal/mol)>α-SAN(45-49Kcal/ mol)>ABS(44-46Kcal/mol)의 순서이다. 내광성과 내후성에 대한 순서는 AES>AECS>α-SAN>ABS의 순이었다. AECS의 열분해반응은 400℃ 이하의 온도에서는 주쇄분해반응으로 이루어진다.

The graft copolymer of 4-chlorostyrene and acrylonitrile onto ethylene-propylene-diene terpoly-mer(EPDM) was synthesized with benzoyl peroxide(BPO) as an initiator at 70℃. The maximum grafting efficiency was 76% when tetrahydrofuran(THF) was used as a solvent. The thermal degradation, flame retar-dancy, light resistance and weatherability of AECS were compared with those of Poly(acrylonitrile-butadiene-styrene)(ABS), Poly(α-methylstyene-acrylonitrile)(α-SAN), Poly(acrylonitrile-EPDM-styrene)(AES). The activation energies of thermal degradation determined by thermogravimetry(TGA) and differential scanning colorimetry(DSC) were in the order of AECS(49-51Kcal/mol)>AES(46-50Kcal/mol)>α-SAN(45-49Kcal/mol)>ABS(44-46Kcal/mol). The light resistance and weatherability were in the order of AES>AECS>α-SAN>ABS. The thermal degradation of AECS was considered to happen by main chain scission at an environ-ment temperature below 400℃.

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