Effect of Particle Distribution on Morphological and Mechanical Properties of Filled Hydrogel Composites

Yanagioka, Masaki; Frank, Curtis W.

doi:10.1021/ma8003778

Cited by 30 publications

(33 citation statements)

References 35 publications

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“…In addition, the volume occupied by the filler particles will affect the polymer chain distribution during polymerization and the resulting polymer chain mobility within the elastomer 3. The modulus values for our composite material are reasonable considering values reported for other highly swollen hydrogels 2,40,41,45-48. Further investigation of the PCCA modulus dependence on nanoparticle and monomer concentrations is currently underway in our laboratory.…”

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confidence: 85%

Dependence of Photonic Crystal Nanocomposite Elasticity on Crystalline Colloidal Array Particle Size

et al. 2009

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The properties of hydrogel materials depend on their network structure, which is determined predominantly by the hydrogel polymer volume fraction and the degree of hydrogel crosslinking. [1][2][3] In an effort to optimize the utility of our photonic crystal hydrogel materials, and to improve our understanding of these nanocomposite systems, we investigated how the mechanical properties of these photonic crystal hydrogels depend upon the diameter of the nonbonded embedded nanoparticles.Our photonic crystal hydrogel materials contain mesoscopically periodic arrays of colloidal particles that self-assemble into highly-ordered crystalline colloidal arrays (CCA), with lattice spacings that Bragg diffract visible light ( Figure 1A).4 -10 The CCA are polymerized within hydrogels forming a polymerized CCA (PCCA). 11 These PCCA optically report on volume changes experienced by the hydrogels, since the observed diffraction wavelength directly depends upon the spacing between lattice planes. These PCCA have been used for chemical sensing by functionalizing them such that changes in the concentration of the analyte of interest actuate changes in the PCCA volume and, thereby, the diffraction wavelength.12 -14 Intelligent PCCA have been developed for the detection of multiple analytes, including glucose,15 -17 cations, 18-20 ammonia, 21 pH, 22 organophosphates, 23 and creatinine. 24 The viscoelastic properties of a hydrogel are predominantly determined by the hydrogel network structure. 1,3 In the work here we develop new insight into this network structure by oscillatory shear rheometry measurements, which characterize the PCCA shear storage modulus. This modulus monitors the effective crosslink density of the PCCA hydrogels. 1,3 The effective crosslink density is derived from normal hydrogel crosslinks, as well as from interactions of the hydrogel network with the embedded nanoparticles.In spite of the numerous studies that examined the impact of nanoparticle inclusions on elastomer mechanical properties, there still remains significant quantitative disagreement on the dependence of these properties on nanoparticle size. 1,3,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] We present here the first definitive study of how the mechanical properties of a swollen hydrogel depend upon the diameter of nonbonded embedded nanoparticles.*asher@pitt.edu Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260, 412-624-8570 (phone), 412-624-0588 (fax). Supporting Information Available. Text giving the experimental details; materials; synthesis of nanoparticles; fabrication of hydrogel materials; characterization of nanoparticles and PCCA hydrogel materials; mechanical analysis of hydrogel materials; graph of modulus versus particle size. This material is available free of charge via the Internet at http://pubs.acs.org. NIH Public Access Author ManuscriptMacromolecules. Author manuscript; available in PMC 2010 July 14. Published in final edited form as:Macromolecules. Mon...

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confidence: 85%

Dependence of Photonic Crystal Nanocomposite Elasticity on Crystalline Colloidal Array Particle Size

et al. 2009

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“…Compared with the conventional small molecular crosslinked gel, the greater mechanical property of nanospheres crosslinked gel is because their crosslinking points are evenly distributed and the flexible polymer chain lengths between the nanospheres are proportional to the inter‐particle distance. Therefore, stress can be evenly distributed between the polymer chains, making crack initiation difficult 22…”

Section: Resultsmentioning

confidence: 99%

Designing Starch‐Based Nanospheres to Make Hydrogels with High Mechanical Strength

Tan

Wang

et al. 2009

Macro Materials & Eng

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A robust method to prepare hydrogels with high mechanical strength is presented. Core/shell nanospheres with derivatizable allyl groups in the shell were first prepared. Starch‐based nanospheres were used as crosslinker to prepare polyacrylamide hydrogels. The starch‐based nanospheres were bridged by acrylamide to form crosslink points in the hydrogel network. They possess an extremely high mechanical strength. The results show that starch‐based nanosphere hydrogels can sustain strengths of 10.34 MPa, which is 60 times greater than for a normal hydrogel. The mechanical properties of SNH can be tailored by varying the content of SN. This approach offered a new way of making functional hydrogel with biodegradable component as a substitute for tissue.magnified image

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“…Thus, in Ref. the effect of agglomeration on mechanical properties of the model composites obtained by encapsulation of colloidal crystalline array inside polymer matrix was evaluated. The prepared composites contained either randomly distributed aggregated nanofiller or uniformly distributed nanofiller.…”

Section: Introductionmentioning

confidence: 99%

“…In literature, the interest in possible destructive changes in polymer matrix of composites under deformation is virtually absent. Such possibility was only mentioned in rare works, and experimental studies of probable chain rupture were carried out much more rarely. Thus, in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C₆₀‐filled polystyrene films

Chubarova

Lebedeva

Melenevskaya

et al. 2016

J of Applied Polymer Sci

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Mechanical properties of filled and neat polystyrene films prepared under the same conditions have been studied. Composite films have been obtained from mixed dilute solutions of polystyrene and C 60 fullerene in various solvents by solvent evaporation on glass substrate. Morphology of the composite films has been shown to depend on preparation conditions and to change both with time and during deformation. Mechanical parameters obtained in tensile tests and by dynamic mechanical analysis of filled and unfilled samples have been found to change with molecular weight of the matrix and preparation conditions as well as during testing. Variability of mechanical properties has been shown to be the effect of destructive changes in polymer matrices during preparation, storage, and deformation.

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Effect of Particle Distribution on Morphological and Mechanical Properties of Filled Hydrogel Composites

Cited by 30 publications

References 35 publications

Dependence of Photonic Crystal Nanocomposite Elasticity on Crystalline Colloidal Array Particle Size

Dependence of Photonic Crystal Nanocomposite Elasticity on Crystalline Colloidal Array Particle Size

Designing Starch‐Based Nanospheres to Make Hydrogels with High Mechanical Strength

Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C₆₀‐filled polystyrene films

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Effect of Particle Distribution on Morphological and Mechanical Properties of Filled Hydrogel Composites

Cited by 30 publications

References 35 publications

Dependence of Photonic Crystal Nanocomposite Elasticity on Crystalline Colloidal Array Particle Size

Dependence of Photonic Crystal Nanocomposite Elasticity on Crystalline Colloidal Array Particle Size

Designing Starch‐Based Nanospheres to Make Hydrogels with High Mechanical Strength

Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C60‐filled polystyrene films

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Product

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Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C₆₀‐filled polystyrene films