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PVC 열분해 속도에 미치는 Metal Stearates와 산소의 영향
Effects of Metal Stearates and Oxygen on Kinetics of Thermal Decomposition of Polyvinyl Chloride
HWAHAK KONGHAK, October 1985, 23(5), 281-287(7), NONE
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Abstract
Metal Stearates를 포함한 PVC를 질소, 산소 및 혼합기체를 공급하면서 비등온 열분해한 결과 순수한 PVC는 3/2차 반응을 나타내고 Metal Stearates를 함유한 PVC는 1차 반응을 나타냈다. 이러한 실험결과를 토대로 하여 새로운 반응 mechanism을 제시하였다. Zinc Stearate를 함유한 PVC는 질소를 공급하며 열분해시킬 때 보다 낮은 농도의 산소를 공급하며 열분해시킬 때 더 큰 값의 활성화 에너지가 필요하였다. 이것은 산화아연이 형성되어 탈염화수소를 촉진시키는 반응 염화아연의 형성이 억제되기 때문이다.
Effects of metal stearates on kinetics of first stage carbonization of PVC were studied on the reaction mechanism of S + gG - g'G’+ rR, that is, one gram of PVC（S） is decomposed to the g’grams of gas(G') and r gram of residue(R).
The reaction rate was obtained by analyzing the thermogravimetric curve measured under a constant heating rate. Pure PVC has the reaction order of 3/2 with respect to residual solid weight, while PVC with a metal stearate has first order reaction. From these results, a new reaction mechanism is suggested to explain the thermal decomposition of PVC with metal stearates.
As the oxygen concentration increases, all samples except for PVC with zinc stearate has lower activation energy and easily decomposes while PVC with zinc-stearate shows higher activation energy in the low oxygen concentration range because the probable formation of zinc oxide suppresses the formation of zinc chloride which accelerates dehydrochlorination.
The reaction rate was obtained by analyzing the thermogravimetric curve measured under a constant heating rate. Pure PVC has the reaction order of 3/2 with respect to residual solid weight, while PVC with a metal stearate has first order reaction. From these results, a new reaction mechanism is suggested to explain the thermal decomposition of PVC with metal stearates.
As the oxygen concentration increases, all samples except for PVC with zinc stearate has lower activation energy and easily decomposes while PVC with zinc-stearate shows higher activation energy in the low oxygen concentration range because the probable formation of zinc oxide suppresses the formation of zinc chloride which accelerates dehydrochlorination.
