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Poly(lactic acid)-starch/Expandable Graphite (PLA-starch/EG) Flame Retardant Composites

Journal of Renewable Materials 2018年第1期6卷 26-37页

作者： mfiso emmanuel mngomezulu Adriaan Stephanus Luyt Steve Anthony Chapple Maya Jacob John Department of Chemistry University of the Free State(Qwaqwa Campus)Private Bag X13Phuthaditjhaba 9866South Africa Center for Advanced Materials Qatar UniversityPO Box 2713DohaQatar CSIR Materials Science and Manufacturing Polymers and Composites Competence AreaPO Box 1124Port Elizabeth 6000South Africa Department of Chemistry Faculty of ScienceNelson Mandela Metropolitan UniversityPO Box 1600Port Elizabeth 6000South Africa

This work reports on the effect of commercial expandable graphite(EG)on the flammability and thermal decomposition properties of PLA-starch *** PLA-starch/EG composites were prepared by melt-mixing and their thermal stability,volatile pyrolysis products and flammability characteristics were *** char residues of the composites,after combustion in a cone calorimeter,were analyzed with environmental scanning electron microscopy(ESEM).The thermal decomposition stability of the composites improved in the presence of ***,the char content was less than expected as per the combination of the wt%EG added into PLA-starch and the%residue of *** flammability performance of the PLA-starch/EG composites improved,especially at 15 wt%EG content,due to a thick and strong worm-like char *** peak heat release rate(PHRR)improved by 74%,the total smoke production(TSP)by 40%and the specific extinction area(SEA)by 55%.The improvements are attributed to the ability of EG to exfoliate at increased temperatures during which time three effects occurred:(i)cooling due to an endothermic exfoliation process,(ii)dilution due to release of H2O,SO2 and CO2 gases,and (iii)formation of a protective intumescent char ***,the CO and CO2 yields were found to be unfavorably high due to the presence of EG.

关键词： Poly(lactic acid)-starch composites expandable graphite thermal stability flammability properties

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