POLYAMIDE 11 POROUS FILMS BY NIPS: THE INFLUENCE OF MISCIBILITY AND POLYMER CRYSTALLINE FORMATION IN PORES STRUCTURE AND MORPHOLOGY

• Published in: Química Nova 2021-01, Vol.44 (6), p.675-682
• Main Authors: Lima, Rayanne, Pereira, Thieres, Silva Filho, Eloi
• Format: Article
• Language: English
• Subjects: cellulose; CHEMISTRY, MULTIDISCIPLINARY; crystallinity; DMA; DSC; polymer
• ISSN: 0100-4042; 1678-7064; 1678-7064
• DOI: 10.21577/0100-4042.20170725

This study described the morphology, crystallinity, thermal and mechanical characterization of Polyamide 11 (PA11) porous film prepared by non-solvent induced phase separation (NIPS) method using formic acid (FA) as solvent. In addition, the miscibility of PA11/FA/H2O system was performed to generate a ternary phase diagram. The porous films morphology was investigated by Scanning Electronic Microscopy (SEM) analysis, the crystallinity by X-Ray Diffractometer (XRD) and thermal study by Differential Scanning Calorimetry (DSC). A cellulosic reinforcement was used in porous films and the stress-strain analysis was performance by Dynamic Mechanical Analysis (DMA). The porous films were prepared with polymer composition of 15, 20 and 25 wt%. The porous films showed different microstructure in function of polymer concentration. The 20 and 25 wt% porous films showed micropores structures with medium pores diameters between 0-10µm calculated by image analysis. The XRD analysis show predominance of α crystalline form of polymer at 20 and 25 wt% porous films. The degree of crystallinity increases with polymer concentration increase. The stress-strain analysis of porous films shows a proportional dependence of Young’s modulus with the increase of polymer concentration in each film.