AI Article Synopsis
- The study describes the preparation of nine types of non-woven PVDF membranes using a phase inversion method, starting with a 15 wt % PVDF solution.
- Different membrane morphologies were obtained by adjusting polymer molecular weights (300 to 700 kDa) and varying coagulation bath temperatures (20, 40, and 60 °C).
- Characterization techniques, including ESEM, AFM, and FTIR, revealed that the membranes' morphologies and phase content are influenced by polymer properties and preparation conditions, offering diverse applications for end users.
Article Abstract
In this study, we successfully prepared nine non-woven, supported polyvinylidene fluoride (PVDF) membranes, using a phase inversion precipitation method, starting from a 15 wt % PVDF solution in -methyl-2-pyrrolidone. Various membrane morphologies were obtained by using (1) PVDF polymers, with diverse molecular weights ranging from 300 to 700 kDa, and (2) different temperature coagulation baths (20, 40, and 60 ± 2 °C) used for the film precipitation. An environmental scanning electron microscope (ESEM) was used for surface and cross-section morphology characterization. An atomic force microscope (AFM) was employed to investigate surface roughness, while a contact angle (CA) instrument was used for membrane hydrophobicity studies. Fourier transform infrared spectroscopy (FTIR) results show that the fabricated membranes are formed by a mixture of TGTG' chains, in α phase crystalline domains, and all-TTTT trans planar zigzag chains characteristic to β phase. Moreover, generated results indicate that the phases' content and membrane morphologies depend on the polymer molecular weight and conditions used for the membranes' preparation. The diversity of fabricated membranes could be applied by the End User Industries for different applications.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6418571 | PMC |
| http://dx.doi.org/10.3390/polym9120718 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
N-oxide-Functionalized Bipyridines as Strong Electron-Deficient Units to Construct High-Performance n-Type Conjugated Polymers.
Adv Sci (Weinh)
January 2025
Key Laboratory of Functional Molecular Solids, Ministry of Education, School of Chemistry and Materials Science, Anhui Normal University, No.189, Jiuhua South Road, Wuhu, Anhui, 241002, China.
Developing low-cost unipolar n-type organic thin-film transistors (OTFTs) is necessary for logic circuits. To achieve this objective, the usage of new electron-deficient building blocks with simple structure and easy synthetic route is desirable. Among all electron-deficient building units, N-oxide-functionalized bipyridines can be prepared through a simple oxidized transformation of bipyridines.
View Article and Find Full Text PDFRescuing ACE2-Deficiency-Mediated Nucleus Pulposus Senescence and Intervertebral Disc Degeneration by a Nanotopology-Enhanced RNAi System.
Adv Sci (Weinh)
January 2025
Department of Orthopedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, 200003, P. R. China.
Nucleus pulposus cell (NPC) senescence contributes to intervertebral disc degeneration (IVDD). However, the underlying molecular mechanisms are not fully understood. In this study, it is demonstrated that angiotensin-converting enzyme 2 (ACE2) counteracted the aging of NPCs and IVDD at the cellular and physiological levels.
View Article and Find Full Text PDFIonic Liquid-Functionalized Defective MOFs for Membrane-Based CO Separation: A Dual Optimization Approach for Interface and Transport.
ACS Appl Mater Interfaces
January 2025
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China.
Defective MOFs have been identified as promising candidates for efficient membrane-based separation applications. However, the utilization of defective MOFs in membrane gas separation is still in its infancy due primarily to the inefficient molecular differentiation induced by structural defects. Herein, we report a strategic combination of ionic liquid (IL) and defective UiO-66-NH MOF to ameliorate the CO/N selectivity within the highly permeable PIM-1 polymer.
View Article and Find Full Text PDFViedma deracemization mechanisms in self-assembly processes.
Phys Chem Chem Phys
January 2025
Laboratoire Softmat, UMR au CNRS no 5623, Université Paul Sabatier, F-31062 Toulouse, France.
Simulations on an ODE-based model shows that there are many common points between Viedma deracemization and chiral self-assemblies of achiral building blocks towards chiral nanoparticles. Both systems occur in a closed system with energy exchange but no matter exchange with the surroundings and show parallel reversible growth mechanisms which coexist with an irreversible cluster breaking (grinding). The various mechanisms of growth give rise to the formation of polymerization/depolymerization cycles while the consecutive transformation of achiral monomer into chiral cluster results into an indirect enantioselective autocatalysis.
View Article and Find Full Text PDFStructurally programmable, functionally tuneable dendrimers in biomedical applications.
Biomater Sci
January 2025
Department of Biological Sciences and Engineering Indian Institute of Technology, Palaj, Gandhinagar 382355, India.
The application of nanotechnology in medical biology has seen a significant rise in recent years because of the introduction of novel tools that include supramolecular systems, complexes, and composites. Dendrimers are one of the remarkable examples of such tools. These spherical, regularly branching structures with enhanced cell compatibility and bioavailability have shown to be an excellent option for gene or drug administration.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!