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dc.contributor.authorOlmo Osuna, Cristian
dc.contributor.authorCasas Becerra, María Teresa
dc.contributor.authorMartínez Guil, Juan Carlos
dc.contributor.authorFranco García, María Lourdes
dc.contributor.authorPuiggalí Bellalta, Jordi
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2019-11-05T16:54:24Z
dc.date.available2019-11-05T16:54:24Z
dc.date.issued2019-04-01
dc.identifier.citationOlmo, C. [et al.]. Crystalline structures and structural transitions of copolyamides derived from 1,4-diaminobutane and different ratios of glutaric and azelaic acids. "Polymers", 1 Abril 2019, vol. 11, núm. 4, p. 572:1-572:19.
dc.identifier.issn2073-4360
dc.identifier.urihttp://hdl.handle.net/2117/171739
dc.description.abstractCopolyamides derived from even 1,4-butanediamine and different mixtures of odd dicarboxylic acids with a great difference in the number of methylene groups (i.e., glutaric and azelaic acids with 3 and 7 groups, respectively) have been synthesized, characterized and structurally studied. Calorimetric analyses revealed a complex behavior with multiple melting peaks associated to lamellar reordering and the presence of defective crystals. Equilibrium melting temperatures were evaluated and showed a eutectic behavior with composition. Copolymers were able to crystallize even for samples with comonomer percentages close to 50%. Negative and ringed spherulites from the melt state and small lath-like lamellar crystals from dilute solution crystallizations were attained. Furthermore, calorimetric data pointed out the exclusion of the less abundant monomer from the lattice of the predominant structure. All samples at room temperature showed a similar crystalline structure (form I) defined by two predominant reflections at spacings close to 0.430 and 0.380 nm, which has been related for even-odd nylons with a two-hydrogen bonded structure. Real time synchrotron experiments showed that melt crystallized samples have two polymorphic transitions on heating, which were practically reversible and consequently were also detected during cooling from the melt state. Interestingly, a different behavior was detected among solution crystallized samples and specifically the transition to the intermediate structure (form II) was not detected during heating for samples enriched on the azelate component or more precisely when they were exclusively crystallized in the form I.
dc.language.isoeng
dc.publisherMultidisciplinary Digital Publishing Institute (MDPI)
dc.rightsAttribution 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials
dc.subjectÀrees temàtiques de la UPC::Enginyeria química
dc.subject.lcshCopolymers
dc.subject.lcshCrystallization
dc.subject.otherEven-odd nylons
dc.subject.otherCopolyamides
dc.subject.otherCrystallization behavior
dc.subject.otherCrystalline structures
dc.subject.otherThermal transitions
dc.subject.otherHydrogen bonds
dc.titleCrystalline structures and structural transitions of copolyamides derived from 1,4-diaminobutane and different ratios of glutaric and azelaic acids
dc.typeArticle
dc.subject.lemacCopolímers
dc.subject.lemacCristal·lització
dc.contributor.groupUniversitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables
dc.identifier.doi10.3390/polym11040572
dc.relation.publisherversionhttps://www.mdpi.com/2073-4360/11/4/572
dc.rights.accessOpen Access
local.identifier.drac25158024
dc.description.versionPostprint (published version)
local.citation.authorOlmo, C.; Casas, M.; Martínez, J. C.; Franco, L.; Puiggali, J.
local.citation.publicationNamePolymers
local.citation.volume11
local.citation.number4
local.citation.startingPage572:1
local.citation.endingPage572:19


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