文献类型：期刊文献

英文题名：Controllable cell structures of poly(ether-block-amide) foams via isothermal melt crystallization-foaming in supercritical CO2

作者：Wang, Chenguang[1];Xu, Menglong[1];Chen, Yichong[1];Xu, Zhimei[1];Zhao, Ling[1];Hu, Dongdong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：201

外文期刊名：JOURNAL OF SUPERCRITICAL FLUIDS

收录：;EI(收录号：20232614306800);WOS:【SCI-EXPANDED(收录号:WOS:001036464000001)】；

基金：Natural Science Foundation of Shanghai (20ZR1413700) , and the Open Project of State Key Laboratory of Chemical Engineering (SKL-ChE-22C02) .

语种：英文

外文关键词：Poly(ether-block-amide); Crystallization; SupercriticalCO2 foaming; Cell structure

摘要：A simple isothermal melt crystallization-foaming method was proposed to regulate the crystallinity (Xc) of PEBA to prepare poly(ether-block-amide) (PEBA) foams with uniform or bimodal cell structures by supercritical CO2. PEBA with different Xc values was obtained by controlling the isothermal crystallization temperature (Tiso) and time (tiso). The rheological and DSC results showed that the viscoelasticity and Xc of the samples increased with decreasing Tiso and increasing tiso. PEBA foams with Xc above 1.1% exhibited a distinct bimodal cell structure. The increased crystals acted as heterogeneous nucleation sites to increase the cell density from 6.8 x 106 cells/ cm3 to 3.58 x 1010 cells/cm3. The size of large cells decreased from 206.4 & mu;m to 48.0 & mu;m, and the number ratio of small to large cells increased from 2.34 to 65 times. Finally, a mechanism to explain the cell structure variation in PEBA foams was proposed, providing a new strategy for regulating the cell structure of polymeric foams.