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Polyalkyl methacrylate의 Blend의 劣力에 關한 硏究
朴相郁,尹漢洙,薛秀德 부산대학교 공과대학 1986 硏究報告 Vol.32 No.-
The thermal decomposition of polymer mixtures such as polymethyl methacrylate and polyethyl methancrylate, and polymethyl methacrylate and polybutyl methacrylate was studied using a dynamic thermogravimetry in the stream of nitrogen gas with 50㎖/min at various heating rate from 1 to 20℃/min, and various heating temperature from 200 to 450℃. Friedman mathematical method was used to obtain the values of activation energy, reaction rate and frequency factor. The value of the activation energy of mixture of PMMA-PEMA was in the range of 36-43 kcal/mol and that of mixture of PMMA-PBMA, 33-38kcal/mol. The value of the activation energy decreased as the increase of the amount of PEMA and PBMA in the mixture. The value of the activation energy of the polymer mixture obeyed the addition rule. The thermogravimetric trace curve agreed with the theoretical equation.
薛秀德,朴相郁 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.2
The thermal decomposition of polyethyl methacrylate was studied using a dynamic thermogravimetry and viscometry techniques in the stream of nitrogen gas with 50ml/min at various heating rates form 230 to 290℃. The mathematical methods, Kissinger, Chatterjee-Conrad, Friedman, Second derivative, Horowitz-Metzger, Ozawa and Isothermal method were used to obtain valuse of activation energy of decomposition reaction. The activation energies evaluated by the above methods except Chatterjee-Conrad method agree with each other very well. The thermal degradation of polyethyl methacrylate was considered to be carried out by main chain scission and the thermogravimetric trace curve agreed with the theoretical equation.
이진국,박상욱,설수덕 한국화학공학회 1985 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.23 No.2
Poly (methyl methacrylate)을 가열속도 1℃/min에서 20℃/min, 가열온도 320℃에서 370℃범위까지 질소기류하에 열분해를 행하여 열분해곡선으로부터 활성화에너지를 구하였다. 활성화에너지를 구하기 위하여 사용된 방법은 Kissinger, Freeman-Carroll, Chatterjee-Conrad, Friedman, Horowitz-Metzger, Coats-Redfern, Ozawa 및 등온법등이다. 이 방법중 Freeman-Carroll법을 제외하고는 활성화에너지는 43∼56Kcal/㏖이었으며, 문헨치와 잘 일치하였다. 또한 PMMA의 열분해는 미분중량분석에 의해 단량체로 분해되고 다순한 분해반응임을 확인하였다. The thermal decomposition of poly (methyl methacrylate) (PMMA) has been studied using a conventional dynamic thermogravimetric technique in a flowing nitrogen gas at several heating rates between 1℃/min and 20℃/min, and at several heating temperatures between 320℃ and 370℃. The degradation was found to be a single process composed of monomer of PMMA as products. The mathematical techniques used for calculation of activation energy are Kissinger, Freeman-Carroll, Chatterjee-Conrad, Friedman, Horowitz-Metzger, Coats-Redfern, Ozawa and Isothermal method. The range of activation energy obtained using the several techniques is between 43 Kcal/㏖ and 56 Kcal/㏖ except Freeman-Carroll method, and this range agrees with the value of reference very well.
김동건,박상욱,설수덕 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.3
Polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate 및 methyl methacrylate-ethyl methacrylate copolymer와 같은 methacrylate계 수지의 열분해 거동을 열중량법과 점도법으로 구했다. Polyalkyl methacrylate의 열분해 반응은 주쇄분해반응으로 이루어지며, 활성화에너지는 측쇄의 탄소수 증가에 따라 감소하고, 열중량곡선은 이론적 감량곡선식과 잘 일치하였다. The thermal decomposition of polyalkyl methacrylate such as polymethyl methacrylate, polyethyl methacrylate, polybutyl methacrylate and methyl methacrylate-ethyl methacrylate copolymer was studied using a thermogravimetry with nitrogen gas feed rate of 50㎖/min at various heating rates from 1 to 20℃/min, and various heating temperatures from 200 to 370℃. Viscometry techniques were also used to measure molecular weight changes during the thermal decomposition. The mathematical methods, Kissinger, Chatterjee-Conrad, Friedman, Second derivative, Horowitz-Metzger, Ozawa and Isothermal method were used to obtain values of activation energy of decomposion reaction. The activation energies evaluated by the above methods except Chatterjee-Conrad method agree with each other very well. The values of activation energy evaluated by viscometry are also similar with those by thermogravimetry. The thermal degradation of polyalkyl methacrylate was considered to be carried out by main chain scission, and the values of activation energy decreased in the order of methyl, ethyl and buthyl group. The thermogravimetric trace curve agreed with the theoretical equation. The value of activation energy of the copolymer obeyed the addition rule.