Morphology and performance of polyvinylidene fluoride (PVDF) membranes prepared by the CCD method: Thermodynamic considerations
File(s)
Accepted version
Author(s)
Peng, Hao
Shah, Vatsal
Li, K
Type
Journal Article
Abstract
The combined crystallisation and diffusion method (CCD) has recently demonstrated its superiority in producing high-performance PVDF membranes over the traditional membrane preparation methods. The CCD method involves a unidirectional cooling step in its membrane preparation. While the role of kinetics behind the CCD method has been thoroughly studied by varying the cooling rate, the cooling temperature itself has never been changed from −30 °C. This study therefore explores the thermodynamic implications of changing the cooling temperature during the CCD process on the morphology and performance of the resultant membranes. Two different molecular weights of PVDF were studied and different batches of membranes were prepared by progressively changing the cooling temperature from −30 °C to 0 °C. The results showed that for both the PVDF types, with an increase in cooling temperature, the separation surface pore sizes and membrane permeances increase but more so for the one prepared using the higher molecular weight PVDF. This showcases the ability to tailor the properties of the CCD membranes by merely changing the cooling temperature. The membranes were then also characterised for their morphology, mechanical strengths and crystallinity to help further understand the role of cooling temperature in affecting these membrane properties.
Date Issued
2021-09-21
Date Acceptance
2021-09-10
Citation
JOURNAL OF MEMBRANE SCIENCE, 2021, 641
ISSN
0376-7388
Publisher
ELSEVIER
Journal / Book Title
JOURNAL OF MEMBRANE SCIENCE
Volume
641
Copyright Statement
© 2021 Elsevier B.V. All rights reserved
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000705870800002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
EP/R029180/1
Subjects
Science & Technology
Technology
Physical Sciences
Engineering, Chemical
Polymer Science
Engineering
PVDF membrane
Nucleation
Crystallisation
Coalescence
Microfiltration
Ultrafiltration
INDUCED PHASE-SEPARATION
MOLECULAR-WEIGHT
COAGULATION CONDITIONS
POLYMER
CRYSTALLIZATION
TEMPERATURE
SCAFFOLDS
MECHANISM
MIXTURES
BEHAVIOR
Publication Status
Published
Article Number
ARTN 119857