摘要
以经硅烷偶联剂(KH570)处理的微晶纤维素(MCC)为填料,三嗪系膨胀阻燃剂(CFA)与聚磷酸铵(APP)的复配体系为阻燃剂(C-IFR),聚乳酸(PLA)为基体树脂,采用熔融共混方法制备阻燃MCC/PLA复合材料,研究了MCC对阻燃PLA复合材料的力学、阻燃性能、热稳定性的影响。力学试验结果显示,MCC加入使PLA和阻燃PLA均比纯基体树脂的拉伸强度、弯曲强度有所降低,对悬臂梁缺口冲击强度影响小。MCC在小添加量时可以提高PLA复合体系的极限氧指数,MCC与APP具有的协同效应降低了PLA的燃烧速率,提高了材料的成炭性能。热降解动力学表明,MCC增加了PLA和阻燃PLA材料的活化能,提高了PLA复合材料的热稳定性,同时MCC降低PLA的玻璃化转变温度。
Microcrystalline cellulose(MCC)was treated by silane coupling agent(KH-570)to be the filler.The compound system of triazine-based intumescent flame retardant(CFA)and ammonium polyphosphate(APP)was used as the flame retardant(C-IFR)and polylactic acid(PLA)was used as the matrix resin.The flame-retardant MCC/PLA composites were prepared by melt blending method.The effect of MCC on the mechanical,flame-retardant properties and thermal stability of flame-retardant MCC/PLA composites was investigated.The mechanical test indicates that the addition of MCC reduces the tensile strength and flexural strength of PLA matrix and flame-retardant PLA compared to pure PLA,but it has negligible effect on the impact strength of the cantilever beam.When the addition of MCC is small,it can increase the limiting oxygen index(LOI)of PLA composite systems.The existence of a synergistic effect between MCC and APP can efficiently reduce the burning rate of PLA and improve the char-forming properties of the composites.The thermal degradation kinetics show that MCC can increase the activation energy of PLA and flame-retardant PLA composites,improve the thermal stability of PLA composites and decrease the glass transition temperature of PLA.
机构地区
东北林业大学化学化工与资源利用学院
出处
《塑料工业》
CAS
CSCD
北大核心
2021年第4期48-53,共6页
China Plastics Industry
关键词
聚乳酸
微晶纤维素
力学性能
阻燃性能
热稳定性
Poly(lactic acid)
Microcrystalline Cellulose
Mechanical Properties
Flame Resistance
Thermal Stability
