摘要
针对难以同时获得具有高阻燃性和高韧性聚乳酸(PLA)的现状,文中将聚磷酸铵和植酸钙复配形成膨胀阻燃剂加入到通过动态硫化法制备的韧性聚乳酸/不饱和聚酯共混物中(TPLA),详细研究了二者配比对TPLA阻燃性能、燃烧行为、热性能以及力学性能的影响。热重分析表明,该膨胀阻燃剂的引入并没有破坏TPLA的热稳定性,反而提高了其高温残炭量。极限氧指数(LOI)、垂直燃烧和锥形量热测试结果显示,该复配阻燃剂对TPLA表现出优异的阻燃性能,添加质量分数10%聚磷酸铵和5%植酸钙后,TPLA可以通过UL-94V-0级,LOI达到27%;与纯PLA相比,改性后TPLA的峰值热释放速率和总热释放分别下降57.5%和69.5%。力学测试结果表明,阻燃TPLA的断裂伸长率和缺口冲击强度相比聚乳酸有大幅上升,分别为聚乳酸的7.6倍和6.5倍。
Simultaneously endowing poly(lactic acid)(PLA)with flame retardancy and toughness still is a challenge.Focus on this issue,an intumescent flame retardant composed of calcium phytate(PA·Ca)and ammonium polyphosphate(APP)is added into PLA which is toughen by biobased unsaturated polyester via dynamic vulcanization(TPLA).The effect of mass ratio of PA·Ca and APP on the properties of TPLA were investigated.Thermogravimetric results show that the introduction of flame retardants does not destroy the thermal stability of PLA materials,on the contrary,the residue is enhanced greatly.After adding 10%APP and 5%PA·Ca,the TPLA can pass UL-94V-0level,and its LOI value is 27%.Besides,cone calorimeter results show the peak heat release rate and total heat release of modified TPLA are decreased 57.5%and 69.5%,respectively.It is worth mentioned that the toughness of modified TPLA is improved greatly,in which its elongation at break and notched impact strength are 7.6and 6.5times respectively as those of neat PLA.
作者
李德福
邓聪
汪秀丽
王玉忠
Defu Li;Cong Deng;Xiuli Wang;Yuzhong Wang(National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan),College of Chemistry,Sichuan University,Chengdu 610064,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2020年第3期23-29,共7页
Polymer Materials Science & Engineering
基金
国家重点研发计划项目(2016YFB0302102,2016YFB0302100)。
关键词
聚乳酸
增韧
阻燃
植酸钙
聚磷酸铵
polylactic acid
toughen
flame retardant
calcium phytate
ammonium polyphosphate
