高发泡倍率PBAT泡沫的制备及回弹性能的探究

Study on preparation and resilience of PBAT foams with high volume expansion ratio

提出了一种绿色、简单、可行的方法来解决聚对苯二甲酸己二酸丁二醇酯(PBAT)高发泡倍率泡沫的皱缩问题。首先将扩链剂(CE)、泡孔稳定剂(GMS)与PBAT进行熔融共混,然后进行超临界二氧化碳发泡。结果表明,CE的加入使储能模量提高了3个数量级,复数黏度提高了2个数量级;随着GMS含量的增加,PBAT泡沫的尺寸稳定性逐渐提高,当CE和GMS的含量分别是2%和1.8%时,发泡倍率达到23.1倍,收缩率8%,回弹率90%,成功制备出具有良好回弹性和尺寸稳定性的高发泡倍率的PBAT泡沫。

In this paper,a green,simple,and feasible method was developed for solving the shrinking problem of poly(butylene adipate-butylene terephthalate)(PBAT)foams with a high volume expansion ratio.Firstly,a chain extender(CE)and a cell stabiliser(GMS)were melt blended with PBAT,and then supercritical CO2 was used to prepare PBAT foams.The rheological test results indicated that the addition of CE increased the energy-storage modulus by 3 orders of magnitude and the complex viscosity by 2 orders of magnitude.The dimensional stability of the PBAT foams increased gradually with an increase in the GMS content.The PBAT foams obtained an expansion ratio of 23.1 at a CE content of 2 wt%and a GMS content of 1.8 wt%,and their shrinkage rate and resilience rate was 8%and 90%,respectively.This indicated the successful preparation of the PBAT foams with a high expansion ratio,and excellent resilience,and good dimensional stability.