Poly(butylene adipate - co - terephthalate)/Polylactic Acid Foamed Beads Prepared by Supercritical CO2

被引：0
|
作者：
Xie M. [1 ,2 ]
Du J. [1 ,2 ]
Zhang S. [1 ,2 ]
Hu Y. [1 ,2 ]
Liu Q. [1 ,2 ]
Fu X. [1 ,2 ]
Zhang R. [1 ,2 ]
Hu S. [1 ,2 ]
机构：
[1] Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan
[2] School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2022年 / 38卷 / 08期
关键词：
Crystallization; Poly(butylene adipate-co-terephthalate); Polylactide; Shrinkage; Supercritical carbon dioxide;
D O I：
10.16865/j.cnki.1000-7555.2022.0171
中图分类号：
学科分类号：
摘要：
Poly(butylene adipate - co - terephthalate) (PBAT) is prone to bubble collapse and shrinkage during the foaming process due to its low melt strength and modulus. In this paper, PBAT/PLA foamed beads were prepared using polylactic acid (PLA, 175 ℃) with higher melting point and PBAT (125 ℃) with lower melting point at 180 ℃ used scCO2 as foaming agent, by heating- up method (impregnation at 50 ℃ and foaming at 130 ℃ ). Rotational rheometer results show that the storage modulus and viscosity of the blends increase with the increasing of PLA content. Differential scanning calorimetry and polarizing microscope results show that PLA crystals do not melt during foaming and scCO2 promotes the crystallisation of the blends. Scanning electron microscopy and foaming diagrams show that the pore density and volume expansion of the blended foamed beads increase and then decrease with the increasing of PLA content, and the average mean diameter decreases. At the PLA mass fraction of 5%, the cell density reaches the maximum of 7.489×107 cm- 3, the expansion rate reaches 9.47 times, the shrinkage rate is as low as 5.6% and the surface of the foamed beads is smooth. This method provides a simple method for the industrial production by improving PBAT cell morphology and shrinkage resistance through heating up method with a small amount of PLA, without the loss of PBAT degradability. © 2022, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：66 / 74
页数：8
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