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Solid-state modification of PBT with cyclic acetalized galactitol and D-mannitol: Influence of composition and chemical microstructure on thermal properties Lavilla Aguilar, Cristina Gubbels, Erik Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon Noordover, Bart A. J. Koning, Cor E. Muñoz Guerra, Sebastián Universitat Politècnica de Catalunya. Departament d'Enginyeria Química Universitat Politècnica de Catalunya. POL - Polímers Industrials Avançats i Biopolímers Tecnològics Àrees temàtiques de la UPC::Enginyeria química Polymers solid state modification PBT Galactitol D-Manitol Polímers 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 Peer Reviewed Postprint (published version) 2013-06-11 Article Lavilla, 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. 0024-9297 https://hdl.handle.net/2117/19670 10.1021/ma400760d eng http://pubs.acs.org/toc/mamobx/current http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Restricted access - publisher's policy Attribution-NonCommercial-NoDerivs 3.0 Spain 11 p. application/pdf American Chemical Society (ACS)