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발포제 ADCA의 열분해 특성
Thermal Decomposition Characteristics of Blowing Agent ADCA
한국산업안전공단 산업안전보건연구원, 인천 403-711
Occupational Safety & Health Reserch Institute, KOSHA, Incheon 403-711, Korea
kekim@kosha.net
HWAHAK KONGHAK, August 2002, 40(4), 427-430(4), NONE
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Abstract
아조계 발포제 아조다이카본아미드(azodicarbonamide, ADCA) 입도별 4종(2-3, 6-7, 14-16, 23 μm)에 대해서 시차주사열량계(differential scanning calorimeter, DSC) 및 단열형 열량계인 가속속도열량계(accelerating rate calorimeter, ARC)를 이용하여 열분해특성을 고찰하였다. 본 연구의 실험결과, 시료입도가 작을수록 발열개시온도, 발열최고온도 그리고 발열종료온도 등은 보다 낮은 온도로 이동하였으며 발열량은 증가하는 경향을 나타내었다. DSC와 ARC측정결과를 비교하였을 때, 발열개시온도의 경우 ARC측정값이 DSC측정값 보다 55-65 ℃ 낮게 측정되었고, 발열량의 경우 ARC측정값이 DSC측정값 보다 135-150 cal/g 높게 측정되었다. 이와 같은 단열효과는 시료입자의 크기가 작아질수록 크게 나타나고 있다. 발열개시온도 및 발열량은 승온 속도가 증가함에 따라 증가하는 경향을 나타내었고, 승온 속도와 발열최고온도로부터 구한 활성화 에너지는 37.29 kcal/mol이였다.
The thermal decomposition characteristics of blowing agent azodicarbonamide(ADCA) was investigated by using the differential scanning calorimeter(DSC) and the accelerating rate calorimeter(ARC). Experimental results showed that the exothermic onset temperatures were about 201-206 ℃ by DSC and 136-151 ℃ by ARC. The decomposition temperature acquired from ARC was about 55-65 ℃ lower than that from DSC. Exothermic heats were about 144-150 cal/g by DSC and 274-296 cal/g by ARC. The exothermic onset temperatures were lowered and exothermic heats were increased with decreasing the particle size of ADCA. Exothermic onset temperatures and exothermic heats were increased with increasing the heating rate. The activation energy was about 37.29 kcal/mol, which were obtained from the heating rate and the maximun exothermic temperature.
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Townsend DI, Tou JC, Thermochim. Acta, 37, 1 (1980)
Wilberforce JK, I. Chem. E. Symp. Ser., 85, 329 (1984)
Ottaway MR, Analytical Proceed., 23, 116 (1986)
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Coates CG, Chem. Ind., 7, 84 (1981)
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Morisaki S, Komamiya K, Naito M, "Special Research on the Thermal Stability of Reactive Materials," Safety Document of National Institute of Industrial Safety, Japan, RIIS-SRR-83-1, 1 (1983)
