期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 373, 期 -, 页码 856-865出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2019.04.016
关键词
Polypropylene; Organic-inorganic hybrid; Flame retardant; Hyperbranched polyester
资金
- National Natural Science Foundation of China [51703152, 31700689]
- Natural Science Foundation of Shanxi Province [201701D121044, 201701D121030]
To overcome the flammability and severe dripping of polypropylene (PP), a novel organic-inorganic hybrid KHBPE@APP (microencapsulated APP by a hyperbranched polyester (HBPE) via silane coupling agent (KH-550)) was obtained and used as a high-efficient flame retardant and smoke suppressant. Herein, HBPE acted as the charring agent for APP. 20 wt% of K-HBPE@APP imparted PP excellent flame retardancy, V-0 rating (UL-94 test) and 82.6% decrease in the peak of heat release rate (PHRR). However, PP with 25 wt% of mechanically mixed APP and HBPE achieved V-1 rating (UL-94 test) and 77.3% decrease in PHRR. That is because the direct contact and sufficient interaction between APP and HBPE gives full play to their synergy. Besides, K-HBPE@APP accelerated the formation of cross-linked P-O-C/Si-O-Si/-Si-O-C/Si-O-P/P-O-Phi structures, leading to a strong and compact char layer with a result of dramatic reduction in heat release rate and smoke production. Furthermore, K-HBPE@APP was highly water-resistant and has good compatibility with PP matrix. In particular, the flame-retarded PP had similar tensile strength to pure PP and enhanced impact strength.
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