Exploració per tema "Polièsters"
Ara es mostren els items 1-20 de 56
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A green strategy for the synthesis of poly(ethylene succinate) and its copolyesters via enzymatic ring opening polymerization
(2017-10)
Article
Accés obertPoly(ethylene succinate) (PES) with weight-average molecular weight above 60,000 g mol-1 was efficiently obtained by enzymatic ring opening polymerization of cyclic oligo(ethylene succinate)s c(ES)n, which in turn were ... -
Bio-based aliphatic polyesters from aliphatic diacids and bicyclic alditols: A comparative study
(2016)
Comunicació de congrés
Accés obertIn this work we have prepared and compared the thermal and mechanical properties of aliphatic polyesters made from aliphatic diacids with different polymethylene chain lengths (2, 4, 6, 8) and three bicyclic sugar derived ... -
Bio-based aromatic polyesters and copolyesters by ring opening polymerization
(2016)
Comunicació de congrés
Accés obertIn this work, the synthesis of both c(BF)n and c(BT)n has been performed using the high dilution cyclization technique and these cycles have been then used for the preparation of the homopolyesters PBF and PBT, as well as ... -
Bio-based aromatic polyesters from a novel bicyclic diol derived from D-mannitol
(American Chemical Society (ACS), 2012-10-23)
Article
Accés obert2,4:3,5-Di-O-methylene-D-mannitol, abbreviated as Manx, is a D-mannitol-derived compound with the secondary hydroxyl groups acetalized with formaldehyde. The bicyclic structure of Manx consists of two fused 1,3-dioxane ... -
Bio-based PBS copolyesters derived from a bicyclic D-glucitol
(2015-05-12)
Article
Accés obert2,4:3,5-di-O-methylene-D-glucitol (Glux-diol) was used for the synthesis of poly(butylene succinate) (PBS) copolyesters by melt polycondensation. Glux-diol possess a rigid bicyclic asymmetric structure made of two fused ... -
Bio-based polyesters from cyclic monomers derived from carbohydrates
(Universitat Politècnica de Catalunya, 2013-11-29)
Tesi
Accés obertPolyesters are extremely versatile polymers which can be used in a wide variety of applications ranging from high performance materials to recyclable and degradable polymers. The preparation of polyesters from renewable ... -
Biodegradability and biocompatibility of copoly(butylene sebacate-co-terephthalate)s
(2017-01-01)
Article
Accés obertIn the present study poly (butylene sebacate-co-terephthalate)s having different compositions were synthesized with a high yield and a random distribution by thermal transesterification of poly (butylene sebacate) and poly ... -
Carbohydrate-based copolyesters made from bicyclic acetalized galactaric acid
(2012-04-15)
Article
Accés restringit per política de l'editorialMixtures 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 ... -
Carbohydrate-based PBT copolyesters from a cyclic diol derived from naturally occurring tartaric acid: a comparative study regarding melt polycondensation and solid-state modification
(2014-04-01)
Article
Accés restringit per política de l'editorial2,3-O-Methylene-L-threitol (Thx) is a cyclic carbohydrate-based diol prepared by acetalization and subsequent reduction of the naturally occurring tartaric acid. The structure of Thx consists of a 1,3-dioxolane ring with ... -
Carbohydrate-based polyamides and polyesters: an overview illustrated with two selected examples
(2012-02)
Article
Accés obertAn overview on the synthesis, structure and properties of polyamides and aromatic copolyesters produced by using monomers derived from carbohydrates is provided. Two examples are selected for illustration: (a) aliphatic ... -
Cationic poly(butylene succinate) copolyesters
(2016-02-01)
Article
Accés obertThe synthesis, characterization and comparative evaluation of properties of two series of cationic PBS copolyesters bearing respectively ammonium and tributylphosphonium side groups, are reported. The copolyesters with ... -
Cellular structure and mechanical properties of polydhyroxyalkanoate (PHA) based foams
(2015)
Text en actes de congrés
Accés restringit per política de l'editorial -
Chemical structure and microstructure of poly(alkylene terephthalate)s, their copolyesters, and their blends as studied by NMR
(2014-11-17)
Article
Accés restringit per política de l'editorialThe use of NMR spectroscopy in solution to investigate the chemical structure of engineering poly(alkylene terephthalate)s such as poly(ethylene terephthalate) (PET), poly(trimethylene terephthalate) (PTT), and poly(butylene ... -
Cinética de cristalización del poliéster secuencial derivado del ácido glicólico y ácido 4-hidroxibutírico
(Universitat Politècnica de Catalunya, 2007-05)
Projecte/Treball Final de Carrera
Accés obertEl objetivo principal de este Proyecto Final de Carrera es el estudio de la cinética de cristalización del poliéster secuencial poli[ácido 4-hidroxibutírico)-alt-(ácido glicólico)]. El polímero estudiado es un nuevo ... -
Copoliésteres alifáticos derivados del ácido galactárico diacetalizado
(2012)
Comunicació de congrés
Accés obert -
Copolyesters made from 1,4-butanediol, sebacic acid, and D-glucose by melt and enzymatic polycondensation
(2015-03-09)
Article
Accés obertBiotechnologically accessible 1,4-butanediol and vegetal oil-based diethyl sebacate were copolymerized with bicyclic acetalized d-glucose derivatives (Glux) by polycondensation both in the melt at high temperature and in ... -
Crystallization, processing and applications of new polyesters
(Universitat Politècnica de Catalunya, 2015-05-06)
Tesi
Accés obertPoly(alkylene dicarboxylate)s constitute a family of biodegradable polymers with increasing interest for both commodity and speciality applications. The most of these polymers can be prepared from biobased diols and ... -
Development and characterization of multilayer films based on polyhydroxyalkanoates and hydrocolloids
(Wiley, 2016-11-07)
Article
Accés obertNew biodegradable polymeric materials have been developed in order to minimize the environmental impact caused bythe traditional packaging found in the market. Polyhydroxyalkanoates (PHAs) are biopolymers with important ... -
Effect of chain extender and water-quenching on the properties of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) foams for its production by extrusion foaming
(2016-10-01)
Article
Accés obertBacterial polyesters such as polyhydroxyalkanoates (PHAs) are of great interest for a large number of applications both because of their properties and because they come from renewable resources, despite having a higher ... -
Effect of hydroxyapatite nanoparticles on the degradability of random poly(butylene terephthalate-co-aliphatic dicarboxylate)s having a high content of terephthalic units
(2016-07-06)
Article
Accés obertCopolyesters derived from 1,4-butanediol and constituted also of aliphatic and aromatic dicarboxylate units in a molar ratio of 3:7 were synthesized by a two-step polycondensation procedure. Succinic, adipic, and sebacic ...