Solid-state modification of PBT with cyclic acetalized galactitol and D-mannitol: Influence of composition and chemical microstructure on thermal properties
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Tipus de documentArticle
Data publicació2013-06-11
EditorAmerican Chemical Society (ACS)
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Abstract
Two bicyclic carbohydrate-based diols, 2,3:4,5-
di-
O
-methylene-galactitol (Galx) or 2,4:3,5-di-
O
-methylene-
D
-
mannitol (Manx), were introduced into the backbone of
poly(butylene terephthalate) using the solid-state modi
fi
cation
technique (SSM). The resulting copolyesters had a unique
block-like chemical microstructure that endows them with
superior thermal properties when compared with their random
counterparts obtained by melt copolymerization. The materials
prepared by SSM displayed higher melting points, crystal-
lization temperatures, and crystallinity due to the presence of
long PBT sequences in the copolyester. The glass-transition
temperatures also increased upon incorporation of the bicyclic
comonomers, this e
ff
ect being more pronounced for Manx units. The melting points of these block-like copolyesters decreased
after melting due to the occurrence of randomization, but they remained higher than those of copolyesters prepared from the
melt. SSM was demonstrated to be a very suitable technique for the incorporation of rigid monomers into the amorphous phase
of PBT, leading to bio-based non-random copolyesters with remarkable thermal properties
CitacióLavilla, C. [et al.]. Solid-state modification of PBT with cyclic acetalized galactitol and D-mannitol: Influence of composition and chemical microstructure on thermal properties. "Macromolecules", 11 Juny 2013, vol. 46, núm. 11, p. 4335-4345.
ISSN0024-9297
Versió de l'editorhttp://pubs.acs.org/toc/mamobx/current
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