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Carbohydrate-based copolyesters made from bicyclic acetalized galactaric acid Lavilla Aguilar, Cristina Alla Bedahnane, Abdelilah Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon Benito, Elena García Martín, Maria de Gracia Galbis Pérez, Juan Antonio 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 Polyesters Polymerization Polièsters Polimerització Mixtures of the dimethyl esters of adipic acid and 2,3:4,5-di-O-methylene-galactaric acid (Galx) were made to react in the melt with either 1,6-hexanediol or 1,12-dodecanediol to produce linear polycyclic copolyesters with aldarate unit contents varying from 10 up to 90 mole %. The copolyesters had weight–average molecular weights in the ∼35,000–45,000 g mol−1 range and a random microstructure, and were thermally stable up to nearly 300 °C. They displayed Tg in the -50 to -7 °C range with values largely increasing with the content in galactarate units. All the copolyesters were semicrystalline with Tm between 20 and 90 °C but only those made from 1,12-dodecanediol were able to crystallize from the melt at a crystallization rate that decreased as the contents in the two comonomers approached each other. Copolyesters containing minor amounts of galactarate units adopted the crystal structure characteristic of aliphatic polyesters but a new crystal polymorph was formed when the cyclic sugar units became the majority. Stress–strain parameters were sensitively affected by composition of the copolyesters with the mechanical behavior changing from flexible/ductile to stiff/brittle with the replacement of adipate units by the galactarate units. Peer Reviewed Postprint (published version) 2012-04-15 Article Lavilla, C. [et al.]. Carbohydrate-based copolyesters made from bicyclic acetalized galactaric acid. "Journal of polymer science. Part A, polymer chemistry", 15 Abril 2012, vol. 50, núm. 8, p. 1591-1604. 0887-624X https://hdl.handle.net/2117/16184 10.1002/pola.25930 eng http://onlinelibrary.wiley.com/doi/10.1002/pola.25930/abstract info:eu-repo/grantAgreement/EC/FP7/226716/EU/European Light Sources Activities/ELISA http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Restricted access - publisher's policy Attribution-NonCommercial-NoDerivs 3.0 Spain 14 p. application/pdf