Poly(lactic acid)-starch/Expandable Graphite (PLA-starch/EG) Flame Retardant Composites
作者机构：Department of ChemistryUniversity of the Free State(Qwaqwa Campus)Private Bag X13Phuthaditjhaba 9866South Africa Center for Advanced MaterialsQatar UniversityPO Box 2713DohaQatar CSIR Materials Science and ManufacturingPolymers and Composites Competence AreaPO Box 1124Port Elizabeth 6000South Africa Department of ChemistryFaculty of ScienceNelson Mandela Metropolitan UniversityPO Box 1600Port Elizabeth 6000South Africa
出 版 物：《Journal of Renewable Materials》 (可再生材料杂志（英文）)
年 卷 期：2018年第6卷第1期
页 面：26-37页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：National Research Foundation
主 题：Poly(lactic acid)-starch composites expandable graphite thermal stability flammability properties
摘 要：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.
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