College of Materials Science and Engineering, Central South University of Forestry and Technology, 410004 Changsha, PR China.
College of Materials Science and Engineering, Central South University of Forestry and Technology, 410004 Changsha, PR China.
Int J Biol Macromol. 2022 Sep 1;216:456-464. doi: 10.1016/j.ijbiomac.2022.06.209. Epub 2022 Jul 7.
Biodegradable composites were prepared from polylactic acid (PLA) and bamboo charcoal (BC) by melt blending and hot pressing. The effects of BC addition on the mechanical properties, water absorption, DMA, TGA, DSC, and CONE of BC/PLA composites were investigated. The microscopic morphology of the composites was analyzed by SEM. The results showed that for BC addition of 40 wt%, the mechanical strength, thermal properties, and flame retardant properties of the composites were improved compared with those of PLA, with a 2.24 % increase in flexural strength and a 1535 % increase (500 °C) in TG mass retention rate. The crystallinity increased by 129.66 %, the peak loss factor decreased by 31.15 %, the time required for combustion was delayed by 168 s, the peak heat release rate decreased by 29.40 %, the carbon residue rate detected by cone calorimetry increased by 48.50 %, and the peak mass loss rate decreased by 48.82 %. The addition of BC enhanced the crystallization capacity of PLA, and improved the thermal properties and flame retardant properties of the prepared composites. The results showed that materials prepared with a BC content of 40 wt% exhibited the best overall performance.
采用熔融共混和热压的方法，由聚乳酸（PLA）和竹炭（BC）制备了可生物降解复合材料。研究了 BC 对 BC/PLA 复合材料的力学性能、吸水率、DMA、TGA、DSC 和 CONE 的影响。通过 SEM 分析了复合材料的微观形貌。结果表明，对于 BC 含量为 40wt%的添加量，复合材料的力学强度、热性能和阻燃性能均得到了提高，与 PLA 相比，弯曲强度提高了 2.24%，TG 质量保留率提高了 1535%（500°C）。结晶度增加了 129.66%，损耗因子峰值降低了 31.15%，燃烧时间延迟了 168s，峰值热释放速率降低了 29.40%，锥形量热法检测的炭残留率增加了 48.50%，峰值质量损失率降低了 48.82%。BC 的添加增强了 PLA 的结晶能力，提高了所制备复合材料的热性能和阻燃性能。结果表明，BC 含量为 40wt%的材料表现出最佳的综合性能。
