期刊
MACROMOLECULES
卷 42, 期 16, 页码 6159-6165出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma900928z
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资金
- National Science Foundation, Polymers Program [DMR-0551465]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0901180] Funding Source: National Science Foundation
A detailed analysis of the bands appearing in the OH stretching region of the infrared spectrum of poly(vinylphenol) and their changes with temperature is presented. Bands usually assigned to free (nonhydrogen-bonded) groups contain overlapping contributions from both monomeric and end-group species, both hydrogen-bonded to 7 orbitals. Assignments of bands due to hydrogen-bonded groups are made on the basis of whether the proton and oxygen in a particular OH group are both involved in hydrogen bonds (as donors and acceptors, respectively) or whether one or the other is free (not hydrogen-bonded). The assignment of other modes is more uncertain, and various possibilities are discussed. Changes in absorption coefficient with temperature appear to affect bands due to hydrogen-bonded groups in the interior of chains and monomeric species by essentially the same amount. The large change in absorption coefficient of the hydrogen-bonded band relative to a band assigned to free groups postulated in a previous study is more likely due to a change in the distribution of hydrogen-bonded and free species that were not resolved in previous work.
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