Flame retardancy of polypropylene (nano)composites containing LDH and zinc borate

Polymers for Advanced Technologies - Tập 22 Số 7 - Trang 1131-1138 - 2011
Linjiang Wang1, Xuejun He1, Hongdian Lu2, Jianxiang Feng3, Xiangli Xie4, Shengpei Su3, Charles A. Wilkie2
1Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, Guilin University of Technology, Guilin 541004, China
2Department of Chemistry and Fire Retardant Research Facility, Marquette University, PO Box 1881, Milwaukee, WI 53201, USA
3Department of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China
4College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.

Tóm tắt

Polypropylene (PP)/organically‐modified layered double hydroxides (LDH) and PP/organo‐LDH/zinc borate (BZn) (nano)composites were prepared by the melt blending method. The structures and morphologies of (nano)composites were characterized by X‐ray diffraction and TEM. The flammability properties and thermal stability were studied using TGA, cone calorimeter, limiting oxygen index (LOI), and the UL94 protocol. The basal spacing of organo‐LDH increases to 3.89 nm from 0.76 nm in pristine LDH. When 10% of the organo‐LDH was melt blended with PP, the basal spacing of the LDH increases to 4.01 nm. The onset temperature and thermal decomposition temperature of the PP/organo‐LDH and PP/organo‐LDH/zinc borate (nano)composites have no significant change compared to pristine PP, but the amount of non‐volatile residue remaining at 600°C is significantly higher than that in pure PP. The cone calorimetric results show a 38% reduction in the peak heat release rate for PP/10%BZn and 48, 50 and 63% reductions for PP/organo‐LDH/10%BZn (nano)composites at 3, 5 and 10% organo‐LDH loading. The limiting oxygen indices of all samples increase by a slight amount and all samples can obtain a UL‐94 HB rating. The char content of PP/LDH/BZn and PP/BZn/organo‐LDH (nano)composites is much greater than that of PP/LDH, PP/BZn and PP/organo‐LDH. Copyright © 2011 John Wiley & Sons, Ltd.

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Thông tin
Thông tin xuất bản

Polymers for Advanced Technologies

Tập 22 Số 7

1131-1138

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