Structure and properties of polypropylene composites filled with magnesium hydroxide

被引:128
|
作者
Chen, Xiaolang
Yu, Jie
Guo, Shaoyun [1 ]
机构
[1] Sichuan Univ, Polymer Res Inst, State Key Lab Polymer Mat Engn, Chengdu 610065, Peoples R China
[2] Mat Engn & Technol Innovat Ctr Guizhou, Guiyang 550014, Peoples R China
关键词
polypropylene; magnesium hydroxide; surface treatment; crystallization; flame retardant; thermal stability;
D O I
10.1002/app.24938
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Silane and silicone oil modified superfine magnesium hydroxide (MH) was filled into polypropylene (PP) as a flame retardant. The PP and flame-retarded PP composites were studied for their mechanical properties and rheological behaviors by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), limiting oxygen index (LOI), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The results showed that the addition of MH improved flame retardancy of PP/MH composites, but seriously deteriorated mechanical properties of the composites. Surface treatment of MH could significantly improve tensile and impact strength of PP/MH composite because of its enhanced interfacial adhesion between MH and PP matrix. DSC results showed that MH had heterogeneous nucleation effect on PP. Surface treatment of MH weakened its heterogeneous nucleation effect. POM results showed that the dispersion of MH particles played an important role in the crystalline morphology and spherulite size of PP crystals. TGA indicated that MH greatly enhanced the thermal stability of PP. The introduction of treatment agent further improved the thermal oxidative stability of the composite. According to LOI silane-treated MH greatly enhanced flame retardancy of PP/MH composites. (c) 2006 Wiley Periodicals, Inc.
引用
收藏
页码:4943 / 4951
页数:9
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