Durable Polysulfones with Densely Sulfonated Segments for Highly Proton Conducting Membranes
Author
Summary, in English
The thesis work focused on extensive study of the preparation of hydrocarbon (HC) membranes with high performance and durability, based on the engineering polymers with high thermal/chemical/mechanical stabilities combined with low cost and environmental friendliness. The first part of the thesis gives a general description of fuel cells, a review of the current development of HC polymers and a brief summary of the the six research articles whose details are covered by the second part of the thesis. The important synthetic strategies applied in the thesis work are 1. the use of fully aromatic backbones based on polysulfones, 2. The incorporation of densely sulfonated units in the polymers, 3. The placement of the acidic groups in ortho-to-sulfone positions. The first point is to enhance the characteristic features of the HC polymers in relation to PFSAs. The second is to improve the proton conductivity and dimensional stability. In addition, the last is to give the most chemical stable acidic group among the HC polymers.
In summary, some of the polymers obtained in the thesis gave quite comparable proton conductivities to that of PFSAs. One outstanding finding is that the polymers showed a higher proton conductivity than that of PFSAs at cold climate. The polymers were also found to possess a very high resistance towards the decomposition of the acidic groups. Finally, a new concept, microblock copolymers, was suggested as potential candidates for ion-exchange membrane applications towards commercialization because of the cost performance and straight-forward preparation, in addition to the performance and durability.
Department/s
Publishing year
2012
Language
English
Document type
Dissertation
Publisher
Lund University (Media-Tryck)
Topic
- Chemical Sciences
Keywords
- polymer electrolytes
- sulfonations
- polycondensation
- polyaromatics
- ionomers
- sulfonated monomers
- block copolymers
- segmented copolymers
- sequenced copolymers
- poly(arylene ether sulfone)s
- lithiations
- sulfinations
- metalations
- phase-separation
- highly sulfonations
- macromonomers
- blocky structures
Status
Published
Supervisor
ISBN/ISSN/Other
- ISBN: 978-91-7422-311-8
Defence date
3 December 2012
Defence time
13:00
Defence place
Lecture Hall K:C, Center for Chemistry and Chemical Engineering, Getingevägen 60, Lund University, Faculty of Engineering
Opponent
- Steven Holdcroft (Professor)