Abstract
To get an in-depth understanding of the structure–property relationship
in saturated polyester resins, the reactivity of various diols and
diacids as well as reaction conditions were studied. Adipic acid (AA),
phthalic anhydride (PA), isophthalic acid (IPA), terephthalic acid
(TPA), 2-butyl-2-ethyl-1,3-propanediol (BEPD) and
2,2-dimethyl-1,3-propanediol (NPG) were addressed. It was found that in
addition to linear oligomers with carboxyl and/or hydroxyl end groups
cyclic oligomers were detected. Cyclic dimers of TPA and NPG are known
to migrate to the coating surface causing “blooming”. The understanding
of this phenomenon and the monomers capable of forming cyclic dimers are
the subject of this study, where we combined molecular modeling and
analytical characterization. The probability of the formation of
macrocyclic structures was shown to decrease in the order:
BEPD–PA>BEPD–AA≥BEPD–IPA>BEPD–TPA. The temperature dependence was
found to be small.
| Original language | English |
|---|---|
| Pages (from-to) | 8283-8290 |
| Journal | Polymer |
| Volume | 41 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 2000 |
| MoE publication type | A1 Journal article-refereed |