摘要
为了获得热稳定、阻燃和力学性能均较好的复合材料,以高密度聚乙烯/乙烯-醋酸乙烯酯(HDPE/EVA)共混物为基体,可膨胀石墨(EG)作为无卤阻燃剂,通过熔融共混方法制备了HDPE/EVA/EG阻燃复合材料.采用热重分析(TGA)、锥形量热仪、电子扫描电镜(SEM)等方法研究了钛酸酯偶联剂改性前后EG对复合材料的热稳定性能、阻燃性能以及力学性能的影响.研究结果表明,EG能提高聚合物基体材料的热稳定性能和阻燃性能,但力学性能降低;用钛酸酯偶联剂对EG改性后,HDPE/EVA/EG复合材料的断裂伸长率从232.3%提高到315.3%,拉伸强度由9.0 MPa增到了10.0 MPa,冲击强度由88 k J/m2提高到129 k J/m2.偶联剂的存在提高了EG与基体间的界面粘结力,使阻燃复合材料的综合力学性能得到改善.
In order to obtain the composites with good thermal stability, flammability, and mechanical properties, high density polyethylene/ethylene-vinyl acetate copolymer （HDPE/EVA） composites filled with expandable graphite （EG） flame retardant were prepared by using a twin-screw extruder technique. The thermal stability, flammability, and mechanical properties of the composites were investigated by the thermogravimetric analysis （TGA）, cone calorimeter, mechanical properties tests, and scanning electron microscopy （SEM）. The results indicated that the addition of EG significantly enhanced the thermal stability and fire resistance of the HDPE/EVA materials, but obviously decreased the mechanical properties of HDPE/EVA/EG. After the surface treatment of EG with titanate coupling agent, the elongation at break of HDPE/EVA/EG composites increased from 232.3% to 315.3% , the tensile strengths increased from 9.0 to 10.0 MPa, and the impact strengths increased from 88 to 129 kJ/m2. The improvement of the mechanical properties of HDPE/EVA/EG composites was due to the enhancement of interracial adhesion between EG and polymer matrix.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2014年第6期1097-1101,共5页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(51003088)
高等学校博士学科点专项基金资助项目(20100184120006)
国家科技支撑计划资助项目(2007BAB08B05)
中央高校基本科研业务费专项资金资助项目(SWJTU12CX009)
关键词
高密度聚乙烯
乙烯-醋酸乙烯酯
可膨胀石墨
阻燃
表面处理
high-density polyethylene （ HDPE ）
ethylene expansible graphite （EG）
flame retardancy
surface treatment matrix vinyl-acetate copolymer （ EVA ）
