期刊
JOURNAL OF CO2 UTILIZATION
卷 34, 期 -, 页码 274-281出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.06.014
关键词
Cellulose acetate; PVDF-HFP; Levan; Supercritical CO2; Membrane; Foam
资金
- Ministerio de Educacion y Formacion Profesional, Spain [CAS18/0060, FPU 14-04914]
With the aim of increasing the mechanical and biological properties of different materials, a supercritical CO2 (SC-CO2) assisted technique was used to include a polymer with a natural origin (levan) in membranes of cellulose acetate (CA) and polyvinylidenefluoride-co-hexafluoropropylene (PVDF-HFP). CA-levan membranes were characterized by interconnected pores ranging from 9 to 13 mu m; due to levan addition, composite membranes increased their mechanical resistance and cells adhesion (from 8% to 30%). In the second system, the processing of a PVDF-HFP-DMSO-levan colloidal suspension system caused a morphological modification and the generation of a foam-like structure; a decrease of the mechanical resistance and an increase of cells adhesion (from 8% to 35%) were observed. Stress-strain responses for both systems were fitted using two different hyperelastic equations, Yeoh and Ogden; deviations from experimental data lower than 15% were obtained. In conclusion, SC-CO2 assisted process was able to generate composite structures with levan, accessible to the cells; i.e., transforming polymers like CA and PVDF-HFP in potentially useful materials for biological applications.
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