Accession Number:

ADA623344

Title:

Thermally Cross-Linked Anion Exchange Membranes from Solvent Processable Isoprene Containing Ionomers

Descriptive Note:

Journal article preprint

Corporate Author:

COLORADO SCHOOL OF MINES GOLDEN

Personal Author(s):

• Tsai, Tsung-Han
• Ertem, S. P.
• Maes, Ashley M.
• Seifert, Soenke
• Herring, Andrew M.
• Coughlin, E. B.

Report Date:

2015-01-15

Pagination or Media Count:

11.0

Abstract:

Random copolymers of isoprene and 4-vinyl- benzyl chloride VBCl with varying compositions were synthesized via nitroxide-mediated polymerization. Subsequent quaternization afforded solvent processable and cross-linkable ionomers with a wide range of ion exchange capacities IECs. Solution cast membranes were thermally cross-linked to form anion exchange membranes. Cross-linking was achieved by taking advantage of the unsaturations on the polyisoprene backbone, without added cross-linkers. A strong correlation was found between water uptake and ion conductivity of the membranes conductivities of the membranes with IECs beyond a critical value were found to be constant related to their high water absorption. Environmentally controlled small-angle X-ray scattering experiments revealed a correlation between the average distance between ionic clusters and the ion conductivity, indicating that a well-connected network of ion clusters is necessary for efficient ion conduction and high ion conductivity.

Descriptors:

• *COPOLYMERS
• *CROSSLINKING(CHEMISTRY)
• *ION EXCHANGE
• *IONOMERS
• *ISOPRENE
• ABSORPTION
• BENZYL RADICALS
• CHEMICAL REACTIONS
• CHLORIDES
• CLUSTERING
• CONDUCTIVITY
• CORRELATION
• EXPERIMENTAL DESIGN
• HEAT
• HIGH RATE
• MEMBRANES
• POLYMERS
• SOLVENTS
• SYNTHESIS(CHEMISTRY)
• THERMAL PROPERTIES
• WATER
• X RAY SCATTERING

Subject Categories:

• Physical Chemistry
• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE