环氧基POSS对PLA/PBAT共混材料发泡行为的影响

Effect of Epoxy-based POSS on Foaming Behavior of PLA/PBAT Blends

通过熔融共混法制备了聚乳酸/聚己二酸对苯二甲酸丁二酯/聚倍半硅氧烷(PLA/PBAT/POSS)复合材料,并利用超临界二氧化碳(CO_2)固相发泡法对复合材料进行发泡,通过差示扫描量热仪、高级动态流变仪和扫描电子显微镜等对复合材料的结晶行为、流变行为和发泡行为进行了研究。结果表明,POSS粒子对基体树脂具有增塑效应,PLA的冷结晶温度降低,结晶度提高;复合体系的流变性能明显提高,其发泡材料的泡孔密度和发泡倍率均随着POSS粒子含量的增加而增大,当加入7份(质量份,下同)POSS时,发泡材料的泡孔密度提高至8.25×10~7个/cm^3,发泡倍率达到13倍;POSS粒子对PLA泡沫的泡孔形态具有显著的调控作用。

Poly(lactic acid)(PLA)/poly(butyleneadipate-co-terephthalate)(PBAT)/polyhedral oligomeric silsesquioxane(POSS)composites and their foams were prepared by a melt-mixing method and a supercritical CO_2 solid state foaming method,respectively.Thermal behavior,rheological property,and foaming behavior of the composites were studied.The results confirmed the plasticization effect of POSS particles on the composites.The rheological results indicated that melt elasticity of the composites was improved with the addition of POSS.As a result,cellular structure of the composites foams was enhanced.Cell density and foaming expansion ratio of the composite foams increased with an increase of POSS content.The composite foams achieved a cell density of 8.25×10~7 cell/cm^3 and an expansion ratio of 13 at the POSS content of 7 phr.POSS was found to have a positive effort on controlling the cellular structure of the composite foams.