摘要
采用9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)和1,2,3,6-四氢邻苯二甲酸酐(THPA)对瓜尔胶(GG)进行改性得到磷化瓜尔胶(DTGG),并通过核磁共振和傅里叶变换红外光谱对其结构进行表征。以DTGG为碳源,聚磷酸铵(APP)为酸源和气源对聚乳酸(PLA)进行阻燃改性。通过垂直燃烧(UL 94)、极限氧指数(LOI)和锥形量热仪(CONE)对PLA共混物的阻燃性能进行测试。采用热失重分析(TG)和场发射扫描电子显微镜(FESEM)对其热性能和形貌进行表征。结果表明,当DTGG/APP的质量比为9/11时,LOI值为33.4%,达到UL 94 V-0等级。同时,样品的总热释放(THR)值最低,与纯PLA相比降低了33.8%。从FESEM观察到阻燃剂在PLA基质中分布均匀。DTGG和APP的协同作用有效地增强了PLA共混物的阻燃性能。最后讨论了DTGG和APP对PLA共混物的协同阻燃作用机制。
Phosphating guar gum(DTGG)was obtained through the modification of guar gum(GG)with 9,10⁃dihydro⁃9⁃oxa⁃10⁃phosphaphenanthrene⁃10⁃oxide(DOPO)and 1,2,3,6⁃tetrahydrophthalic anhydride(THPA),and its chemical structure was determined using Fourier⁃transform infrared spectroscopy and nuclear magnetic resonance spectroscopy.Flame⁃retardant poly(lactic acid)(PLA)blends were prepared through melt⁃blending PLA with DTGG as a carbon source and ammonium polyphosphate(APP)as acid and gas sources.The flame retardant properties of the resulting blends were investigated through vertical burning experiments(UL 94),limiting oxygen index(LOI),and the cone cal⁃orimeter tests,and their thermal properties and morphology were characterized through thermogravimetric analysis and field⁃emission scanning electron microscopy(FESEM).The results indicated that the blends obtained an LOI value of 33.4 vol%at a DTGG/APP mass ratio of 9/11 and achieved a UL 94 V⁃0 classification in the vertical burning experi⁃ment.Meanwhile,the blends showed the lowest total heat release(THR)value,which decreased by 33.8%compared to that of pure PLA.The uniform distribution of DTGG and APP in the PLA matrix was found from the FESEM obser⁃vation.The synergistic effect of DTGG and APP effectively enhanced the flame retardancy of PLA.The synergistic mechanism of DTGG and APP for the flame retardancy of PLA was also proposed.
作者
刘会媛
马闯
关俊霞
李繁麟
杨笑春
张青
LIU Huiyuan;MA Chuang;GUAN Junxia;LI Fanlin;YANG Xiaochun;ZHANG Qing(College of Chemistry,Tangshan Normal University,Tangshan 063000,China;College of Chemistry and Chemical Engineering,Hebei Normal University for Nationalities,Chengde 067000,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2023年第4期53-59,共7页
China Plastics
基金
唐山市人才资助项目(A202203029)
唐山师范学院校级项目(2022C44)。
关键词
聚乳酸
瓜尔胶
聚磷酸铵
阻燃性
poly(lactic acid)
guar gum
ammonium polyphosphate
flame retardancy
