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Changes in the reactivity of functional groups during polyesterification: A new approach to polymerization in fatty‐acid‐modified polyesters (alkyd resins)
Author(s) -
Solomon D. H.,
Loft B. C.,
Swift Jean D.
Publication year - 1967
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/app.1967.070110820
Subject(s) - alkyd , polyester , reactivity (psychology) , polymerization , gel point , polymer chemistry , materials science , condensation polymer , organic chemistry , chemical engineering , polymer science , chemistry , polymer , medicine , alternative medicine , pathology , engineering , coating
Gel‐point calculations based on the theory of polyesterification proposed by Flory do not agree with the experimental values even when Bobalek's concept of gel point as the first formation of infinite molecules (microgel) is used. Resins covering the range 30–60% oil length were prepared and examined by electron microscopy for the presence of microgel particles. The extent of reaction at which microgel forms is discussed in relation to the concept of equal reactivity. The conditions necessary for the formation of microgel particles and the significance of these observations to the basic assumptions used in developing the theory of polyesterification are discussed.