2 options
Thermo stability of highly sulfonated poly(styrene-isobutylene-styrene) block copolymers : effects of sulfonation and counter-ion substitution / James M. Sloan [and others].
- Format:
- Book
- Government document
- Series:
- ARL-TR (Aberdeen Proving Ground, Md.) ; 4357.
- ARL-TR ; 4357
- Language:
- English
- Subjects (All):
- Block copolymers.
- Molecular structure.
- Ion exchange.
- molecular structure.
- Physical Description:
- 1 online resource (iv, 14 pages) : illustrations (some color)
- Place of Publication:
- Aberdeen Proving Ground, MD : Army Research Laboratory, [2008]
- Summary:
- In this study, poly(styrene-isobutylene-styrene) (SIBS) block copolymers were characterized by thermogravimetry as a function of sulfonation level (53% to 97%) and counter-ion substitution (Mg+2, Ca+2, Ba+2). Sulfonated samples showed an additional minor loss of mass at ~290 plus/minus 2 deg. C, which was not observed in the unsulfonated polymer. At this temperature, desulfonation or a cleavage reaction of the aromatic carbon-sulfur bond occurs. The counter-ion substituted membranes did not show the degradation temperature at 290 deg. C, but additional unique degradation temperatures above 500 deg. C, which suggests improved thermal stability for the ionically cross-linked polymer with cations. Some cations (Mg+2, Ca+2, Ba+2) showed multiple high temperature degradations, which suggest that different cross-linked structures occur throughout the phase-segregated morphology.
- Notes:
- Title from title screen (viewed December 20, 2010).
- "January 2008."
- Includes bibliographical references (page 12).
- OCLC:
- 318683905
- Access Restriction:
- APPROVED FOR PUBLIC RELEASE.
The Penn Libraries is committed to describing library materials using current, accurate, and responsible language. If you discover outdated or inaccurate language, please fill out this feedback form to report it and suggest alternative language.