Dynamic crystallization kinetics and morphology of carbonaceous nanofillers-reinforced poly (lactic acid) foams

编号 020036405

推送时间 20221010

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Dynamic crystallization kinetics and morphology of carbonaceous nanofillers-reinforced poly (lactic acid) foams

来源期刊 Thermochimica Acta

期 第364期

发表时间 20221001

关键词 Poly (lactic acid);  Carbon black;  Multi-walled carbon nanotubes;  Graphene oxide;  Crystallization kinetics; 

摘要 Carbon black (CB), multi-walled carbon nanotubes (CNT), and graphene oxide (GO)-reinforced poly (lactic acid) (PLA) foams were prepared. Morphological studies indicated that incorporating nanoparticles into foamed PLA (F-PLA) changed the sphericity degree, diameter, and homogeneity of cells. Among all samples, foamed PLA containing 0.25 phr GO exhibited the highest void content (+46%) compared to foamed neat PLA, while its cell density diminished by 21%. In contrast, despite a lower improvement in void content (+18%), foamed PLA containing 0.25 phr CNT experienced a +3% enhancement in cell density compared to foamed neat PLA. Also, the nanoparticles were well dispersed in un-foamed PLA without any obvious aggregation. The crystallization kinetics of foams were studied using DSC. The results revealed that PLA foams reinforced with 0.25 phr CNT and GO had a significant effect on crystallization promotion. The crystallization kinetics of foamed samples were studied using different models such as Jeziorny, Avrami, Ozawa, Kissinger, and Doyle-Ozawa. The results demonstrated that adding nanofillers did not affect the crystallization mechanism of foamed PLA. Also, incor-porating up to 0.5 phr CNT and GO decreased the apparent crystallization activation energy compared to neat F -PLA. An almost similar trend was observed for the local crystallization activation energy.

服务人员 尚玮姣

服务院士 宋湛谦

PDF文件 浏览全文