The effects of silica nanoparticles on the photocuring behaviors of UV-curable polyester acrylate-based coating systems

Cho, Jung Dae; Kim, Yang Bae; Ju, Hyoung Tae; Hong, Ji Won

doi:10.1007/bf03218467

Cited by 41 publications

(22 citation statements)

References 10 publications

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“…Both the parameters increased as the nanofiller concentration increased up to 5% (of the weight of the formulation, can be understood as the critical concentration), where as an opposite trend was recorded when the nanofiller concentration reached above 10%. 21 Values of the diffusion exponent for the samples of slab geometry in dynamic swelling experiment were found to be greater than 1.0 for all the cross-link densities, which predicted that the transport of water was directed by super case II mechanism. Super case II model of diffusion is a modified version of case II diffusion and it demonstrates that unlike case II model, the water transport is not completely diffusion or relaxation controlled process but is governed by combination of more than one of these processes, for example, swelling driven by osmotic pressure, diffusion, relaxation and erosion, and so forth.…”

Section: Discussionmentioning

confidence: 95%

Rapid prototyping of three-dimensional nanocomposite hydrogel constructs: Effect of silica nanofiller on swelling and solute release behaviors of the nanocomposite hydrogels

Mishra

Scarano²,

Calvert

2015

J. Biomed. Mater. Res.

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Three-dimensional (3D) patterning and engineering of biomaterials and biointerfaces have helped bioengineers harness the full potential of cell immobilization for different biomedical applications. However, the bioengineering of an efficient cell immobilized tool, having application in cell biology and tissue engineering, often comes into realization only when a cell friendly immobilization technique is combined with a compatible 3D patterning scheme. We have previously demonstrated the successful blue light induced photopolymerization of poly (ethyleneglycol) diacrylate (PEGDA) based hydrogels for the entrapment of Saccharomyces cerevisiae and NIH 3T3 fibroblast cells. In the present work we have modified rheology of the prepolymer solution by mixing fumed silica nanofiller in different concentrations. Here we demonstrate the rapid prototyping of cell immobilized nanocomposite hydrogels, where S. cerevisiae loaded nanofilled prepolymer solution was directly written in layer-by-layer fashion using solid free form fabrication also known as rapid prototyping technique and was cross-linked into 3D cell loaded construct via blue light induced polymerization. The swelling trend was found to be a function of silica nanofiller concentration and transitioned from decreasing to increasing type at 10% w/v nanofiller concentration. Dynamic swelling profile predicted that the swelling agent transported with in the gels via super case II type transport mechanism irrespective of the crosslink density. In contrast, the mode of transportation of the loaded solute was found to be fickian and nonfickian type respectively for loosely and tightly crosslinked gels. Spatial heterogeneity in the crosslinked network was resulted upon blue light curing, subsequently the 3D growth of the immobilized cells was observed to be a function of crosslink density.

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Section: Discussionmentioning

confidence: 95%

Rapid prototyping of three-dimensional nanocomposite hydrogel constructs: Effect of silica nanofiller on swelling and solute release behaviors of the nanocomposite hydrogels

Mishra

Scarano²,

Calvert

2015

J. Biomed. Mater. Res.

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“…[24][25] On the other hand, in some studies, an optimum loading of silica nanoparticles has been reported in which the polymerization rate reaches the maximum value. [26][27][28][29] In these studies, silica nanoparticles can improve the mobility and diffusion of propagating radicals, which lead to increase in the rate of polymerization. In this work, the reduction of polymerization rate at higher amount of particles has been attributed to less system stability due to the formation of aggregates.…”

Section: Polymerization Kineticsmentioning

confidence: 99%

A kinetics study on thein situreversible addition–fragmentation chain transfer and free radical polymerization of styrene in presence of silica aerogel nanoporous particles

Sobani

Haddadi‐Asl

Mirshafiei-Langari

et al. 2013

Designed Monomers and Polymers

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Nanoporous silica aerogel particles were synthesized via sol-gel process and modified with a hydrophobic surfactant. Batch polymerizations of styrene in presence of silica aerogel particles were studied via free radical and reversible addition-fragmentation chain transfer (RAFT) polymerizations. Monomer conversion, molecular weight, and polydispersity index of each system were monitored during polymerization to investigate the reaction kinetics. According to results, in both systems, the presence of silica aerogel particles has a sensible influence on polymerization kinetic and adding aerogels results in decreased polymerization rate, conversion, and molecular weight. Moreover, the prepared samples were characterized by Fourier transform infrared spectroscopy. Also, thermal gravimetric analysis (TGA) and differential scanning calorimetric techniques was used to observe the effect of aerogel particles on thermal properties of synthesized nanocomposites. According to TGA depiction, in free radical samples, one-stage degradation, related to random chain scission, is observed while degradation of RAFT-prepared nanocomposites occurred in two steps due to the decomposition of RAFT moieties and random chain scission.

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“…Photopolymerization kinetics of (meth)acrylate monomers containing dispersed nanosilica were considered in several papers and various dependences of the polymerization rate and conversion on silica content were obtained; the results were explained in various ways [9][10][11][12]. Ours previous papers [8,13,14] analyzed kinetics more deeply (in the considered cases a maximum on the dependence of the polymerization rate on the silica content was observed).…”

Section: Introductionmentioning

confidence: 99%

Photocurable polymethacrylate-silica nanocomposites: correlation between dispersion stability, curing kinetics, morphology and properties

2016

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A comprehensive study of model systems based on poly(ethylene glycol) dimethacrylate and two methacryloxymodified silicas (Aerosil R7200 and R711) were investigated to find possible correlation between the stability of the monomer/silica dispersion, curing kinetics, composite morphology and physical and mechanical properties of the final hybrid material. The monomer/silica dispersions were cured photochemically. The investigated parameters: Zeta potential, polymerization rate and conversion, glass transition, surface roughness and mechanical properties were found to be synchronous; when plotted as function of silica content, they showed maxima or changes in the trend at the same filler loading. This threshold (optimum) silica content in the composition was about 5 wt.-% for the investigated systems. The results obtained are discussed in terms of the solvation cell (which influences dispersion stability) and the interphase layer formation as well as their changes below and above of the threshold filler content.

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The effects of silica nanoparticles on the photocuring behaviors of UV-curable polyester acrylate-based coating systems

Cited by 41 publications

References 10 publications

Rapid prototyping of three-dimensional nanocomposite hydrogel constructs: Effect of silica nanofiller on swelling and solute release behaviors of the nanocomposite hydrogels

Rapid prototyping of three-dimensional nanocomposite hydrogel constructs: Effect of silica nanofiller on swelling and solute release behaviors of the nanocomposite hydrogels

A kinetics study on thein situreversible addition–fragmentation chain transfer and free radical polymerization of styrene in presence of silica aerogel nanoporous particles

Photocurable polymethacrylate-silica nanocomposites: correlation between dispersion stability, curing kinetics, morphology and properties

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