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木质素纳米颗粒：增强聚乳酸中木质素阻燃效果的一种有前景的方法

Lignin Nanoparticles as A Promising Way for Enhancing Lignin Flame Retardant Effect in Polylactide.

作者信息

Chollet Benjamin, Lopez-Cuesta José-Marie, Laoutid Fouad, Ferry Laurent

机构信息

Centre des Matériaux des Mines d'Ales, IMT Mines Ales, University of Montpellier, 30319 Alès, France.

Laboratory of Polymeric & Composite Materials, Materia Nova Research Center, 3 avenue Nicolas Copernic, B-7000 Mons, Belgium.

出版信息

Materials (Basel). 2019 Jul 2;12(13):2132. doi: 10.3390/ma12132132.

DOI:10.3390/ma12132132
PMID:31269752
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6651329/
Abstract

The present study investigates the effect of using lignin at nanoscale as new flame-retardant additive for polylactide (PLA). Lignin nanoparticles (LNP) were prepared from Kraft lignin microparticles (LMP) through a dissolution-precipitation process. Both micro and nano lignins were functionalized using diethyl chlorophosphate (LMP-diEtP and LNP-diEtP, respectively) and diethyl (2-(triethoxysilyl)ethyl) phosphonate (LMP-SiP and LNP-SiP, respectively) to enhance their flame-retardant effect in PLA. From the use of inductively coupled plasma (ICP) spectrometry, it can be considered that a large amount of phosphorus has been grafted onto the nanoparticles. It has been previously shown that blending lignin with PLA induces degradation of the polymer matrix. However, phosphorylated lignin nanoparticles seem to limit PLA degradation during melt processing and the nanocomposites were shown to be relatively thermally stable. Cone calorimeter tests revealed that the incorporation of untreated lignin, whatever its particle size, induced an increase in pHRR. Using phosphorylated lignin nanoparticles, especially those treated with diethyl (2-(triethoxysilyl)ethyl) phosphonate allows this negative effect to be overcome. Moreover, the pHRR is significantly reduced, even when only 5 wt% LNP-SiP is used.

摘要

本研究考察了使用纳米级木质素作为聚乳酸（PLA）新型阻燃添加剂的效果。通过溶解沉淀法由硫酸盐木质素微粒（LMP）制备了木质素纳米颗粒（LNP）。微米级和纳米级木质素均使用氯磷酸二乙酯（分别为LMP-diEtP和LNP-diEtP）以及二乙基（2-(三乙氧基甲硅烷基)乙基）膦酸酯（分别为LMP-SiP和LNP-SiP）进行功能化处理，以增强它们在PLA中的阻燃效果。通过电感耦合等离子体（ICP）光谱分析可知，大量的磷已接枝到纳米颗粒上。此前已表明，将木质素与PLA共混会导致聚合物基体降解。然而，磷酸化木质素纳米颗粒似乎能限制PLA在熔融加工过程中的降解，并且纳米复合材料显示出相对较高的热稳定性。锥形量热仪测试表明，无论粒径大小，加入未处理的木质素都会导致热释放峰值（pHRR）增加。使用磷酸化木质素纳米颗粒，尤其是用二乙基（2-(三乙氧基甲硅烷基)乙基）膦酸酯处理的纳米颗粒，可以克服这种负面影响。此外，即使仅使用5 wt%的LNP-SiP，pHRR也会显著降低。

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