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Poly ( Alkyl Methacrylate ) 와 Tetrabromobisphenol - A ( TBBA ) Blend 의 열분해에 관한 연구
김동건,신봉섭,설수덕,손진언 ( Dong Keun Kim,Bong Sub Shin,Soo Duk Seul,Jin Eon Sohn ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.6
The thermal degradation behavior of poly(alkyl methacrylate) and flame-retardant, tetrabromobisphenol-A(TBBA) mixture was analyzed using the Gel Permeation Chromatography(GPC), Infra-red Spectroscopy(IR), Gas Chromatography(GC) and Thermogravimetric Analysis(TGA) under nitrogen gas flow of 50 ㎖/min at various heating rates ranging from 4 to 20℃/min. The activation energy of thermal degradation in the mixture was determined using the Friedman method. The optimum thermal stabilization was obtained in PMMA/TBBA=95/5, PEMA/TBBA=97/3 and PBMA/TBBA=97/3 blend. At GPC analyses, the viscosity average molecular weight in the mixture was decreased slowly with decomposition temperature. At IR analyses, the value of carbonyl index in the mixture was increased slowly with reaction time and temperature. The thermal degradation mechanism of poly(alkyl methacrylate) and TBBA mixture was observed to be main chain scission under nitrogen environment.
내열 및 난연성 Ploymethyl Methacrylate 의 최적 반응속도 모델에 관한 연구
김동건,손진언,설수덕 한국고무학회 1987 엘라스토머 및 콤포지트 Vol.22 No.4
The thermal degradation of the homopolymer poly(methyl methacrylate) (PMMA) and flame-retardant tetrabromobisphenol-A (TBBA) as well as of their blends were carried out using the thermogravimetric method in the stream of nitrogen gas with 60㎖/min at various heating rate from 1 to 20℃/min. Friedman and Ozawa mathematical methods were used to obtain the value of activation energy.
Polymethyl Methacrylate Blend 의 열화에 따른 분해기구 해석에 관한 연구
김동건,손진언,설수덕,문명호 한국고무학회 1988 엘라스토머 및 콤포지트 Vol.23 No.2
The thermal degradation of polymethyl methacrylate(PMMA) blend namely polymethyl methacrylate-polycarbonate(PMMA-PC) blend and polymethyl methacrylate-polystyrene(PMMA-PS) blend were carried out by isothermal method under air at several heating temperature from 220 to 270℃. Molecular weight changes during the thermal decomposition were monitored by means of the viscosity average molecular weight(Mv). The viscosity average molecular weight was determined by Gel Permeation Chromatography(GPC). The dominant process in the degradation of PMMA-PG and PMMA-PS blend were main chain scission randomly due to weak links that may be distributed along the polymer backbone and the initial rate which the bonds are broken is not sustained. The infra-red spectra of degraded PMMA-PS blend show that the presence of aromatic ketone band at 1685㎝^(-1). However, the infra-red spectra of degraded PMMA-PC blend show that the presence of hydroperoxide band at 3450㎝^(-1). Thus indicating that the weak links are attacked by oxygen from the air and produce hydroperoxide or ketone. The activation energies of PMMA-PC blend and PMMA-PS blend were 18.2 and 17.9 Kcal/㏖, respectively.
Poly(methyl methacrylate) 와 Poly(α - methylstyrene - co - acrylonitrile) 혼합물의 열적특성에 관한 연구
김병철,김동건,손진언,설수덕,문덕주 한국고무학회 1988 엘라스토머 및 콤포지트 Vol.23 No.4
The thermal degradation of poly(methyl methacrylate)(PMMA) and poly(α-methylstyrene-co-acrylonitrile) (SAN) mixtures were carried out using the thermogravimetry(TG) and differential scanning calorimetry(DSC) in the stream of nitrogen and air with 50 ㎖/min at the various heating rate from 4 to 20℃/min and temperature from 20 to 500℃. The value of activation energies of thermal degradation determined by TC and DSC in the various PMMA/SAN mixtures were 34-54 ㎉/㏖ in the stream of nitrogen. The value of activation energy of SAN 60% mixture were appeared high in comparison with addition rule. PMMA/SAN mixtures by the analysis of infrared spectrophotometer were decomposed by main chain scission in the stream of nitrogen.