摘要
采用4种经过不同表面处理剂改性的有机层状硅酸盐(Clay)与膨胀型阻燃剂复配阻燃聚乳酸(PLA)。通过熔融共混的方法制备阻燃PLA纳米复合材料,并通过极限氧指数、垂直燃烧、锥形量热测试和热失重分析对材料阻燃性能和热稳定性进行了研究,通过扫描电子显微镜对残炭形貌进行了分析。结果表明,加入经硅氧烷表面处理的Clay的PLA具有最好的热稳定性和阻燃性能;与不加Clay的阻燃PLA复合材料相比,极限氧指数从30.6%提高至34.2%,并且通过垂直燃烧UL 94 V-0级别,热释放速率峰值从283 kW/m^2下降至199 kW/m^2,下降幅度为30%;残炭形貌分析结果显示,加入硅氧烷表面处理之后的Clay能够使残炭更加完整致密,从而提高了材料的阻燃性能。
Layered silicate （Clay） was intercalated by four kinds of organic modifiers and was introduced into polylactide （PLA） forming nanocomposites. Thermal degradation behavior and combustion properties of the composites were evaluated through thermogravimetric analysis, UL 94 experiments, limiting oxygen index, and cone calorimeter tests. Morphology of the char residue was investigated by scanning electronic microscopy. It was found that the addition of 1 % siloxane modified clay resulted in a higher limited oxygen index, higher vertical burning class （UL 94 V-0）, and lower peak heat release rate compared with other composites. Scanning electronic microscopy revealed that the residual char of the composites containing siloxane modified clay was compact, which enhanced the flame retardant properties.
出处
《中国塑料》
CAS
CSCD
北大核心
2016年第6期34-39,共6页
China Plastics
基金
国家自然科学基金资助项目(51503008)
关键词
层状硅酸盐
聚乳酸
硅氧烷
阻燃性能
热稳定性
layered silicate
polylactide
siloxane
flame retardant property
thermal stability
