期刊
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
卷 90, 期 10, 页码 880-890出版社
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/v2012-066
关键词
polyethersulfone; solvent-induced crystallization; crystal structure; polymorphism; X-ray diffraction
资金
- Natural Sciences and Engineering Council of Canada (NSERC)
Crystal forms of polyethersulfones (PES) were investigated by using a model compound and a low molecular weight oligomer. These are amorphous as-synthesized, and can undergo solvent-induced crystallization under the appropriate conditions. The model compound, 4,4'-bis(p-methoxyphenoxy)diphenyl sulfone, yielded monocrystals, and its structure was solved using X-ray diffraction. Conformational disorder is present, two conformers cohabiting in 55: 45 proportions. This model compound, combined to previous structural studies published in the literature, served as a basis for conformational studies of polyethersulfone. Low molecular weight polymers submitted to solvent-induced crystallization resulted in a PES crystal form different from that previously published in the literature, as shown by powder X-ray diffraction.
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