Characterization of Polyisobutylene by Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry

A novel method of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis of isobutylene homopolymers is reported in this paper. Because of the difficulty in attaching ions for such materials, the ionization for MALDI-TOF MS analysis is realized by sulfon...

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Bibliographic Details
Published in:Macromolecules 2002-02, Vol.35 (4), p.1196-1199
Main Authors: Ji, Haining, Sato, Nobuyuki, Nakamura, Yo, Wan, Yunan, Howell, Amy, Thomas, Quinn A, Storey, Robson F, Nonidez, William K, Mays, Jimmy W
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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Summary:A novel method of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis of isobutylene homopolymers is reported in this paper. Because of the difficulty in attaching ions for such materials, the ionization for MALDI-TOF MS analysis is realized by sulfonating the olefin end groups to introduce a readily ionized moiety into the polymer. Polyisobutylene samples obtained from both living cationic polymerization and industral procedures are studied here. The number-average molecular weights and weight-average molecular weights of these materials were also measured by laser light scattering and vapor pressure osmometry. Results obtained from the three techniques agree closely with one another except for the fraction having the highest molecular weight. We postulate that this is due to the range of the molecular weight of this sample being too broad to be accurately measured by MALDI-TOF MS.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma010879i