Strengthening Carbon Deposition of Polyolefin Using Combined Catalyst as a General Method for Improving Fire Retardancy
✍ Scribed by Rongjun Song; Zhiwei Jiang; Haiou Yu; Jie Liu; Zhijun Zhang; Qingwen Wang; Tao Tang
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 128 KB
- Volume
- 29
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Combination of Ni~2~O~3~ and solid acid with Brønsted acid sites and Lewis acid sites (such as HZSM‐5 and H‐beta) could dramatically improve fire retardancy of polyolefin, including polypropylene and linear low‐density polyethylene. This is mainly attributed to the formation of a large amount of residual char from degradation products of polyolefin in the intermediate stage of combustion. Thus, the amount of flammable components diffusing into the flame zone was small. The investigation on the combined effect of solid acid and Ni~2~O~3~ showed that the presence of cationic reactive intermediates, mainly originating from Brønsted acid sites on the solid acid, strongly promoted carbon deposition of the degradation products. As a general method for improving fire retardancy of polyolefin, optimizing combination of metal catalyst and solid acid will further promote efficiency of fire retardancy.
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