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Modeling of unsaturated polyester prepolymer structures. II. Hydroxyl and carboxyl functionalities
Author(s) -
Yang Y. S.,
Pascault J. P.
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970404)64:1<147::aid-app13>3.0.co;2-1
Subject(s) - prepolymer , polyester , dispersity , hydroxyl value , polymer chemistry , chemistry , materials science , saturation (graph theory) , organic chemistry , polyol , polyurethane , mathematics , combinatorics
Based on the structural model being derived in Part I, a statistics approach has been used to further estimate separately carboxyl and hydroxyl functionalities of unsaturated polyester (UP) prepolymers directly from their molecular parameters. This extended model shows satisfactory results when comparing with experimental results of hydroxyl functionality. The influence of molecular parameters, such as hydroxyl and carboxyl indexes, Ordelt saturation extent, and molecular mass polydispersity, on the carboxyl and hydroxyl functionalities is discussed. Examples showing the important impact of synthesis deviation on the hydroxyl and carboxyl functionalities, by model estimation, and, finally, on the SMC thickening are also discussed. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 147–156, 1997