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Determination of primary bond scissions by mass spectrometric analysis of ultrasonic degradation products of poly(ethylene oxide‐ block ‐propylene oxide) copolymers
Author(s) -
Watanabe Takehiro,
Okabayashi Masanori,
Kurokawa Daisuke,
Nishimoto Yukari,
Ozawa Tomoyuki,
Kawasaki Hideya,
Arakawa Ryuichi
Publication year - 2010
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.1771
Subject(s) - chemistry , ethylene oxide , propylene oxide , copolymer , oxide , polypropylene , chemical decomposition , degradation (telecommunications) , polymer chemistry , oxygen , dissolution , polyethylene , chemical engineering , organic chemistry , polymer , decomposition , telecommunications , computer science , engineering
Ultrasonic degradation of poly(ethylene oxide‐ block ‐propylene oxide) copolymers consisting of a hydrophilic and a hydrophobic portion was studied with the aim to determine the location of bonds involved in the initial scission of the copolymers. LC–APCI‐IT‐MS and LC–APCI‐orbitrap‐MS were used for the detailed structural analysis of degradation products. The results indicated that initial bond scissions occurred principally at the boundary regions between backbones of polyethylene oxide (PEO) and polypropylene oxide (PPO) chains. Further structural analysis revealed the presence of oxygen adducts in the degradation products. Comparison with a thermal degradation carried out in helium atmosphere, one can conclude that the oxygen adducts are formed by radical reaction with water or dissolving oxygen molecules. The study demonstrated that chemical reactions as well as physical bond stress scissions are involved in the ultrasonic degradation of the copolymers. Copyright © 2010 John Wiley & Sons, Ltd.