Flammability properties of intumescent PLA including starch and lignin
Flammability properties of intumescent PLA including starch and lignin
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DOI：
10.1002/pat.1130
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发表时间：
2008-06-01
影响因子：
3.4
通讯作者：
Delobel, R.
中科院分区：
文献类型：
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作者：
Reti, C.;Casetta, M.;Delobel, R.
本研究的目的是评价不同的膨胀剂对聚乳酸的阻燃效果。首先，选择了聚磷酸铵(APP)/季戊四醇(PER)体系，因为它以前对聚乙烯基质表现出了良好的性能。然后，PER被木质素和淀粉等生物资源所取代。通过极限氧指数(LOT)、UL-94和锥形量热法对各种配方的阻燃性能进行了评估。与聚乳酸/APP/PER复合材料相比，含有木质素和淀粉的材料显示出较低的批次价值，但在商业上仍然可以接受(优于32%)。相比之下，这些配方的UL评级优于含有PER的配方(V0和V2评级)。锥形量热仪分析证实，“绿色”复合材料形成了一种膨胀结构，最终残留物相当于初始样品质量的50%，放热峰值也降低了50%。最后，遵循混合设计方法优化配方的组成，以最大限度地增加生物资源量。当聚乳酸含量为60%、APP含量为12%、淀粉含量为28%时，复合材料的LOI值为32%。版权所有(C)2008 John Wiley&Sons，Ltd.
The aim of this study is to evaluate the efficiency of different intumescent formulations to flame retard polylactic acid (PLA). First, the ammonium polyphosphate (APP)/pentaerythritol (PER) system is chosen because it previously demonstrated a good behavior for polyethylenic matrices. The PER is then substituted by bioresources such as lignin and starch. The flame retardant properties of the various formulations are evaluated by limiting oxygen index (LOT), UL-94, and cone calorimetry. Compared to the PLA/APP/PER composite, the materials containing lignin and starch show lower LOT values but still commercially acceptable (superior to 32%). In contrast, the UL ratings obtained for these formulations are superior to that containing PER (V0 against V2 rating).The cone calorimeter analysis confirms the formation of an intumescent structure for the "green" composites, with a final residue corresponding to 50% of the initial sample mass and also a decrease in the peak of heat release of 50%. Finally, the composition of the formulation is optimized following a mixture design methodology to maximize the quantity of bioresources. A 32% LOI value is obtained for a composite containing 60% PLA, 12% APP, and 28% starch. Copyright (C) 2008 John Wiley & Sons, Ltd.