Flammability and thermal degradation of poly (lactic acid)/polycarbonate alloys containing a phosphazene derivative and trisilanollsobutyl POSS
Flammability and thermal degradation of poly (lactic acid)/polycarbonate alloys containing a phosphazene derivative and trisilanollsobutyl POSS
复制标题
含有磷腈衍生物和三硅烷醇异丁基 POSS 的聚乳酸/聚碳酸酯合金的可燃性和热降解性
DOI：
10.1016/j.polymer.2015.10.029
复制
发表时间：
2015
期刊：
影响因子：
4.6
通讯作者：
Casetta Mathilde
中科院分区：
文献类型：
--
作者：
Jiang Peng;Gu Xiaoyu;Zhang Sheng;Sun Jun;Xu Riwei;Bourbigot Serge;Duquesne Sophie;Casetta Mathilde
本文报道了我们最近在提高可生物降解的聚乳酸（PLA）的阻燃性和热稳定性方面所做的努力。聚乳酸通常由玉米和甜菜生产。采用经典的Kabachnik-Fields反应合成了六-（磷菲-甲基-（对氢苯）-氨基-苯氧基）-环三磷腈（HPHAPC），并通过熔融共混将其掺入PLA/聚碳酸酯（PC）合金中。通过极限氧指数（LOI）、垂直燃烧（UL-94）和锥量热试验对其进行可燃性评价，结果表明，仅添加3wt % HPHAPC和3wt %多面体低聚硅氧烷（POSS）时，LOI值可达31.5，UL-94等级可通过V-0级。热重分析（TGA）和差示扫描量热分析（DSC）的热行为表征表明，HPHAPC/POSS的存在可以显著促进PLA/PC合金的成焦。采用傅里叶变换红外光谱-热重分析（FTIR-TGA）和热解-气相色谱-质谱分析（Py-GC/MS）对合金的析出气体进行了分析。用扫描电镜（SEM）观察炭的形态。结果表明，在加工过程中，HPHAPC可与POSS反应形成膨胀型碳结构。提出HPHAPC/POSS降解产物可以在气相中捕获自由基，并在凝聚相中促进炭的形成。
AbstractsThis work reports our recent efforts on improving the flame retardancy and thermal stability of biodegradable poly (lactic acid) (PLA) which is usually produced from corn and sugar beets. Hexa-(phosphaphenanthrene-methyl-(p-hydrobenzal)-amino-phenoxyl)-cyclotriphosphazene (HPHAPC) was synthesized by the classic Kabachnik-Fields reaction, and was then incorporated into PLA/polycarbonate (PC) alloys by melt blending. The flammability evaluation by limiting oxygen index (LOI), vertically burning (UL-94) and cone calorimeter tests has indicated that the LOI value can reach up to 31.5 and UL-94 grade can pass V-0 by the presence of only 3 wt% HPHAPC and 3 wt% polyhedral oligomeric silsesquioxane (POSS). The thermal behavior characterization by thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC) shows that the char formation of PLA/PC alloys can be significantly enhanced by the presence of HPHAPC/POSS. The evolved gas of the alloys was analyzed by Fourier transform infrared spectroscopy-TGA (FTIR-TGA) and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS). Char morphology was observed by scanning electronic microscopy (SEM). It is demonstrated that HPHAPC can react with POSS during processing to form an intumescent char structure. It is proposed that the degradation products of HPHAPC/POSS can capture free radicals in the gas phase and enhance char formation in the condensed phase.