Axial Crystal Growth Evolution and Crystallization Characteristics of Bi-Continuous Polyamide 66 Membranes Prepared via the Cold Non-Solvent-Induced Phase Separation Technique

Abstract

Polyamide 66 microporous membranes were prepared by cold non-solvent-induced phase separation using polyamide 66-formic acid-propylene carbonate as a ternary membrane-forming system. The formed membranes exhibited a special bicontinuous structure consisting of interglued spherical crystals or interlocked bundles of microcrystalline aggregates. The variation of the microporous structure under the influence of preparation conditions, solvent, aging time, and polymer concentration affects the comprehensive performance of the membranes. For example, the cold-induced operation and the use of different membrane-forming solvents contributed to the crystallization of polyamide 66, resulting in an increased contact angle of polyamide 66 membranes, obtaining a high resistance to contamination of up to 73.5%. Moreover, the formed membranes still have high mechanical strength.

Tuning Interfacial Adhesion in Polyester/Polyamide Systems

“…As observed with the previous modification method, we also detect that the PET/PA66 has the most significant drop in adhesion strength. PA66 has the highest amide-based polar groups, enhancing its modification ability . We also observe that the adhesion strength approaches steady values as more POMA is added to the system indicating the POMA saturation within the interfacial region …”

“…PA66 has the highest amide-based polar groups, enhancing its modification ability. 43 We also observe that the adhesion strength approaches steady values as more POMA is added to the system indicating the POMA saturation within the interfacial region. 41 We assessed the impact of POMA in a compounded PET− POMA and PA system at higher temperatures.…”

A novel nanohydroxyapatite/polyamide-66 cage for reducing the subsidence rate after single-level anterior cervical discectomy and fusion: a comparative study of 7-year follow-up

“…HA is the main inorganic phase of the bone matrix, so it is widely applied to make scaffolds for bone tissue repair [ 18 ]. PA66 is a form of opalescent crystalline polymer with excellent mechanical properties (good elasticity, strength, and high elongation), and its unique molecular structure is beneficial for its modification [ 19 ]. The nHA crystals and the carboxy and amide groups of PA66 are similar to bone apatite and collagen, respectively, so the n-HA/PA66 composites were used to mimic natural bone in previous studies.…”