Lignin fractionation as an efficient route for enhancing Polylactide thermal stability and flame retardancy

Flame Retardancy and Thermal Stability of Materials Pub Date : 2018-07-25 DOI:10.1515/flret-2018-0002

L. Costes, M. Aguedo, Loic Brison, S. Brohez, A. Richel, F. Laoutid

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引用次数: 7

Abstract

Abstract Due to its variable botanical origin, functionality, reactivity, and heterogeneity, using lignin in industrial application is not an easy task. In the present study, we investigate the effect of lignin fractionation as a simple way for reducing the variability in its properties. Kraft lignin was separated by ultrafiltration membranes in two fractions with a specific molecular weight and the properties of each fraction were characterized through FTIR, XPS, TGA and cone calorimeter test. Lignin fractions display different thermal and combustion behaviors. Thus, the two fractions have been evaluated as flame retardant additives for polylactide (PLA). PLA composites, containing well dispersed lignin (20 wt%), were produced by melt blending in an internal mixer. The thermo-degradant effect of each fraction on PLA during melt processing was investigated by rheological analysis and size exclusion chromatography while the composites thermal stability and fire properties were evaluated using TGA and cone calorimeter test. Results showed that using appropriate lignin fraction enables for obtaining PLA composites presenting enhanced properties

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木质素分馏是提高聚乳酸热稳定性和阻燃性的有效途径

由于其多变的植物来源、功能、反应性和异质性，在工业应用中使用木质素并不是一件容易的事。在本研究中，我们研究了木质素分馏作为一种降低其性质变异性的简单方法的影响。采用超滤膜将硫酸盐木质素分离成具有一定比分子量的两组分，并通过红外光谱(FTIR)、XPS、热重分析(TGA)和锥形量热仪对各组分的性质进行了表征。木质素组分表现出不同的热和燃烧行为。因此，这两个馏分被评价为聚乳酸(PLA)的阻燃添加剂。采用内混炼法制备了分散良好的木质素(20% wt%)的聚乳酸复合材料。采用流变学分析和粒径排除色谱法考察了各组分在熔融加工过程中对PLA的热降解作用，采用热重分析和锥形量热计测试了复合材料的热稳定性和防火性能。结果表明，使用合适的木质素组分可以得到性能增强的聚乳酸复合材料

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Flame Retardancy and Thermal Stability of Materials

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