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Listar por palabra clave "Crystallinity"

Mostrando ítems 1-13 de 13

Comparative study of amorphous and partially crystalline poly(ethylene-2-6-naphthalene dicarboxylate) by TSDC, DEA ,DMA and DCSC

Canadas, J.C.; Diego, J.A.; Sellares, J.; Mudarra, M.; Belana, J.; Díaz Calleja, Ricardo; Sanchis Sánchez, María Jesús (Elsevier, 2000)

[EN] A comparative study of the relaxational behavior of amorphous and partially crystalline poly(ethylene-2,6-naphthalene dicarboxylate) (PEN), has been carried out by thermally stimulated depolarization currents (TSDC), ...
Determining the influence of N-acetylation on water sorption in chitosan films

Gámiz González, Mª Amparo; Piskin, Ayse Esra; Pandis, C.; Chatzimanolis-Moustakas, C.; Kyritsis, A.; Marí Soucase, Bernabé; Gómez Ribelles, José Luís; Vidaurre Garayo, Ana Jesús (Elsevier, 2015-11-20)

Water absorption in chitosan rapidly increases when the deacetylation degree decreases between 85 and 45%. This seems to contradict the fact that water absorption in chitin is much lower than that of chitosan. The aim ...
Development and Characterization of Fully Renewable and Biodegradable Polyhydroxyalkanoate Blends with Improved Thermoformability

Feijoo, Patricia; Samaniego-Aguilar, Kerly; Sánchez-Safont, Estefanía; Torres-Giner, S.; Lagaron, Jose M.; Gamez-Perez, Jose; Cabedo, Luis (MDPI AG, 2022-07)

[EN] Poly(3-hydroxybutyrate-co-3-valerate) (PHBV), being one of the most studied and commercially available polyhydroxyalkanoates (PHAs), presents an intrinsic brittleness and narrow processing window that currently hinders ...
Edible and Biodegradable Starch Films: A Review

Jiménez Marco, Alberto; Fabra Rovira, María José; Talens Oliag, Pau; Chiralt Boix, Mª Amparo (Springer Verlag (Germany), 2012-08)

[EN] Mainly due to environmental aims, petroleum-based plastics are being replaced by natural polymers. In the last decades, starch has been evaluated in its film-forming ability for applications in the food packaging area. ...
Efecto de la incorporación de ácido p-cumárico en las propiedades de films de PHBV

Vila Montalt, Rubén (Universitat Politècnica de València, 2022-10-20)

[ES] El gran aumento en la producción y consumo de plásticos ha generado un grave problema medioambiental por su incapacidad de biodegradación. Por ello se han puesto en marcha diferentes estrategias como el reciclaje y ...
Effect of phenolic acids on the properties of films from Poly (vinyl alcohol) of different molecular characteristics

Andrade, Johana; González Martínez, María Consuelo; Chiralt Boix, Mª Amparo (Elsevier, 2021-09)

[EN] Cinnamic and ferulic acid were incorporated into highly hydrolysed and partially acetylated poly (vinyl alcohol) (PVA) for the purpose of obtaining active films. The microstructure, crystallinity, tensile and barrier ...
Effect of sisal and hydrothermal ageing on the dielectric behaviour of polylactide/sisal biocomposites

Badia, J.D.; Reig-Rodrigo, P.; TERUEL JUANES, ROBERTO; Kittikorn, T.; Strömberg, E.; Ek, M.; Karlsson, S.; Ribes-Greus, A. (Elsevier, 2017-09-08)

[EN] The dielectric properties of virgin polylactide (PLA) and its reinforced composites with different weight amounts of sisal fibres were assessed at broad temperature (from - 130 degrees C to 130 degrees C) and frequency ...
Electrospinning of biodegradable polylactide/hydroxyapatite nanofibers: Study on the morphology, crystallinity structure and thermal stability

Sonseca Olalla, Agueda; Peponi, Laura; Sahuquillo, Oscar; Kenny, J.M.; Giménez Torres, Enrique (Elsevier, 2012)

[EN] Aligned mats of poly(lactic acid) (PLA) nanofibers containing nanosized hydroxyapatite filler have been obtained via electrospinning onto a rotating mandrel. Their structure and morphology have been characterized as ...
Estudio de la aplicación de tratamientos térmicos post-procesado para la mejora de propiedades mecánicas de una mezcla de sulfuro de polifenileno, politetrafluoretileno y fibra de carbono

Delgado Fernández, Andrea (Universitat Politècnica de València, 2022-04-08)

[ES] Aunque tradicionalmente los tratamientos térmicos han sido vinculados a materiales metálicos, estos pueden ser aplicados a cierto grupo de polímeros. Dentro de los polímeros se encuentra un grupo denominado termoplásticos, ...
Hygrothermal ageing of reprocessed polylactide

Badia, J.D.; Santonja Blasco, Laura; Martinez-Felipe, Alfonso; Ribes-Greus, A. (Elsevier, 2012)

[EN] The influence of an accelerated hygrothermal ageing simulation test on a commercial PLA and its three subsequent mechanically-reprocessed materials was studied. The analysis was focused on the water diffusion kinetics ...
Physical-chemical properties of cross-linked chitosan electrospun fiber mats

Sencadas, Vitor Joao Gomes Da Silva; Correia, Daniela; Ribeiro, Clarisse; Moreira, S.; Botelho, G.; Gómez Ribelles, José Luís; Lanceros Mendez, Senen (Elsevier, 2012-12)

Chitosan fiber mats were successfully processed by electrospinning. The as-spun fiber mats were neutralized with ethanol and cross-linked with glutaraldehyde. A decrease of the fiber average diameter from 243 +/- 43 nm ...
Propiedades de films de almidón de maíz. Influencia de la incorporación de lípidos, biopolímeros y compuestos bioactivos

Jiménez Marco, Alberto (Universitat Politècnica de València, 2013-04-25)

Abstract Biodegradable starch-glycerol based films were obtained. The influence of lipid compounds (palmitic, stearic and oleic acid), other polymers (hydroxypropylmethylcellulose and sodium caseinate) and bioactive ...
Tailoring the morphology and crystallinity of poly(L-lactide acid) electrospun membranes

Ribeiro, Clarisse; Sencadas, Vitor Joao Gomes Da Silva; Miguel Costa, Carlos; Gómez Ribelles, José Luís; Lanceros-Mendez, Senentxu (National Institute for Materials Science, 2011)

[EN] Biodegradable poly(L-lactic acid) (PLLA) microfibers were prepared by electrospinning by varying the applied potential, solution flow rate and collector conditions. PLLA fibers with smoothly oriented and random ...