Interaction between water and polymer chains in poly(hydroxyethyl acrylate) hydrogels

Pradas, Manuel Monleón; Ribelles, J.L. Gómez; Serrano‐Aroca, Ãngel; Ferrer, Gloria Gallego; Suay, J.; Pissis, P.

doi:10.1007/s003960000426

Cited by 70 publications

(42 citation statements)

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“…The equilibrium water content (EWC), defined as g water/g dry sample determined by difference in weighing after immersion of the samples in purified water for 24 hours (equilibrium time in agreement with previous PHEA hydrogels studies) [2,29]. As it is shown in Table 1 EWC grows rapidly with the amount of ethanol used in the polymerization due to the extra water that can accommodate in pores.…”

Section: Water Sorptionsupporting

confidence: 67%

“…Important properties of cross-linked hydrogels that make them useful as a potential biomaterials are their remarkable ability to absorb water and their biocompatibility [1][2][3]. Swelling capacity of the hydrogels may be modulated by adjusting cross-linking density of the network and controlling porosity.…”

Section: Introductionmentioning

confidence: 99%

“…Swelling capacity of the hydrogels may be modulated by adjusting cross-linking density of the network and controlling porosity. A microporous hydrogel can be produced by diluting monomer and cross-linker in a suitable solvent since phase separation takes place during polymerization [4,5], being pore size and pore interconnectivity highly dependent on polymerization conditions, in particular the amount of cross-linker and the solvent content in the reacting mixture [2,3,5,6]. Due to their weakness when swollen, some studies have intended to improve their mechanical properties by different methods, for instance by copolymerization alternating hydrophilic and hydrophobic domains [7].…”

Section: Introductionmentioning

confidence: 99%

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Silica phase formed by sol–gel reaction in the nano- and micro-pores of a polymer hydrogel

Bonilla¹,

Gómez-Tejedor²,

Perilla³

et al. 2013

Journal of Non-Crystalline Solids

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ElsevierPlazas Bonilla, CE.; Gómez-Tejedor, JA.; Perilla, JE.; Gómez Ribelles, JL. (2013). Silica phase formed by sol-gel reaction in the nano-and micro-pores of a polymer hydrogel. Journal of Non-Crystalline Solids. 379:12-20. doi:10.1016/j.jnoncrysol.2013. Corresponding author José L. Gómez Ribelles .E-mail address: jlgomez@ter.upv.es AbstractHybrid composites consisting in a hydrogel matrix with silica micro-and nano-particles reinforcement were produced and characterized. The strategy proposed in this work to obtain these composites consisted in a two-step synthesis, being the polymer network formation the first step. Porous poly(hydroxyethyl acrylate) polymer network was produced via free radical polymerization. Monomer and crosslinker were diluted in a varying amount of ethanol that controls the porosity of the resulting network. Polymeric microstructure drives the absorption of a silica precursor solution and the further distribution of the inorganic phase which was formed "in situ" in part occupying the pores and in part in the form of nanoparticles distributed in the polymer phase.Composites with silica content up to 60% by weight were obtained. In the case where the silica phase was continuous, samples maintained their integrity after eliminating the organic phase by pyrolysis. Water absorbed in the gel was able to crystallize, at least in Clara E. Plazas Bonilla, Journal of Non-Crystaline Solids 379 (2013) 12-20 2 part, when the silica content was below 30% by weight. Interestingly, for higher silica content the glass transition of the polymer phase was suppressed as well. Compliance was determined by indentation experiments. A continuous decrease in compliance was observed as filler content increased. Improvement of bioactivity of the material in simulated body fluid was also assessed. The synthetic route proposed allowed obtaining a family of composite hydrogels with variable properties. HighlightsA procedure to synthesize an interconnected silica nanophase in a previously formed polymer hydrogel.Silica nano-and micro-domains formed in a polymer nano-and micro-porous hydrogel by a sol-gel reaction.Hybrid materials with up to 60% by weight silica content in which both silica and organic phases are continuous.

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Section: Water Sorptionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Silica phase formed by sol–gel reaction in the nano- and micro-pores of a polymer hydrogel

Bonilla¹,

Gómez-Tejedor²,

Perilla³

et al. 2013

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

show abstract

“…Hydrogels are impregnated with biologically active agents, such as antibiotics, enzymes, contraceptives, drug antogonists, anticancer drugs etc. and may serve as systems for the controlled release of the agents absorbed to a specific size of the body [8][9][10][11][12]. The acrylate and methacrylate esters provide a series of monomers whose polymers vary from soft, rubberlike materials to hard plastics.…”

Section: Introductionmentioning

confidence: 99%

“…The polymer of n-butyl acrylate is still softer and rather tacky at room temperature. These trends to tackier, softer polymer continue to n-dodecyl (lauryl) ester [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%