Reduction of polymerization shrinkage in methyl methacrylate-montmorillonite composites

Salahuddin, Nehal; Shehata, M. M.

doi:10.1016/s0167-577x(01)00408-6

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…However, such kind of PMMA/MMT nanocomposites reported in the open literature so far were mainly prepared by simply adding MMT clays into commercially available suspension polymerized PMMA through melt intercalation or during curing process , yet the studies of PMMA/MMT nanocomposites prepared by in situ suspension polymerization are scarcely reported. In 2001, Huang et al first reported the synthesis of PMMA/MMT nanocomposites by in situ suspension polymerization and an improvement of thermal stability was observed .…”

Section: Introductionmentioning

confidence: 99%

The effect of clay modification on the mechanical properties of poly(methyl methacrylate)/organomodified montmorillonite nanocomposites prepared byin sitususpension polymerization

Wang

Shan

et al. 2014

Polymer Composites

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Poly(methylmethacrylate) (PMMA)/montmorillonite (MMT) nanocomposites were prepared by in situ suspension polymerization. MMT was previously organically modified by different modification agents [dioctadecyl dimethyl ammonium chloride (DODAC) and methacrylatoethyltrimethyl ammonium chloride (MTC)] and different modification method (cation-exchange reaction and grafting reaction), ultimately giving rise to five kinds of organomodified MMT (OMMT). The structure of the OMMT was studied by Wide angle X-ray diffraction (WAXD) and Fourier transform infrared spectroscopy (FTIR). Meanwhile, the structure of the PMMA/MMT nanocomposites microspheres was also investigated by WAXD. The molecular weight of the polymers extracted from PMMA/MMT nanocomposites was measured by gel permeation chromatograph (GPC). Finally, the mechanical properties of these PMMA/MMT nanocomposites were studied in detail. It was found that large interlayer spacing (d 001 ) of OMMT could not entirely ensure an exfoliated structure of resultant PMMA/MMT nanocomposites, while OMMT with relative small d 001 could still yield exfoliated structure as long as the compatibility between OMMT and polymer matrix was favorable. In addition, the results of mechanical investigation indicated that the compatibility between OMMT and PMMA matrix turned out to be the dominant factor deciding the final mechanical properties of PMMA/ MMT nanocomposites. POLYM. COMPOS., 37:1705-1714, 2016

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Section: Introductionmentioning

confidence: 99%

The effect of clay modification on the mechanical properties of poly(methyl methacrylate)/organomodified montmorillonite nanocomposites prepared byin sitususpension polymerization

Wang

Shan

et al. 2014

Polymer Composites

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“…Such a reaction could make novel poly[oligo(ethylene glycol) diacrylate] (POEGDA)‐clay nanocomposites. Polymers containing the acrylate group, such as poly(methyl methacrylate), have previously been successfully intercalated into the galleries of organically modified clays 30–33. Our preliminary experiments show that POEGDA‐montmorillonite nanocomposites can be prepared by intercalation followed by in situ polymerization in untreated clays 22…”

Section: Introductionmentioning

confidence: 77%

Morphology and elastic modulus of novel poly[oligo(ethylene glycol) diacrylate]‐montmorillonite nanocomposites

Chen

Bowden

Greenwell

et al. 2005

J Polym Sci B Polym Phys

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Novel thermosetting poly[oligo(ethylene glycol) diacrylate]-sodium montmorillonite nanocomposites containing a range of clay volume fractions were prepared by an in situ polymerization method. X-ray diffraction showed that the basal plane spacing of the clay was increased to approximately 1.7 nm regardless of clay volume fraction. Transmission electron microscopy confirmed the basal spacing and intercalated structure. The elastic moduli of the composites were measured using ultrasonic pulse-echo equipment. The results show that the Young's modulus and shear modulus increase with nominal clay volume fraction up to 0.22, and are in good agreement with the well-established Christensen method and derived Hashin-Shtrikman bounds for conventional composites provided that the true volume fraction of clay reinforcement filler is calculated. At low clay volume fractions, the composites were transparent. When the nominal clay volume fraction was further increased, cracks and porous surfaces appeared, as observed by scanning electron microscopy. These defects decreased the elastic modulus, indicating an upper limit for clay additions in this preparation route.

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“…MMT has demonstrated its potential to reduce polymerization shrinkage in methacrylic resins [40,41]. However, many resin-based composites are hydrophobic, which necessitates the modification of the hydrophilic surface properties of MMT to improve its compatibility with these materials.…”

Section: Montmorillonite-resin Compositesmentioning

confidence: 99%

Montmorillonite in dentistry: a review of advances in research and potential clinical applications

Prasad Kumara,

Deng,

Cooper

et al. 2024

Mater. Res. Express

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Montmorillonite (MMT) is a biocompatible, cost-effective phyllosilicate mineral clay material with a nanolayered structure belonging to the smectite group. MMT is frequently used as an adsorbent catalyst in organic synthesis, food additives, cosmetics, medical applications and many other applications in varying industries. MMT has been incorporated into numerous experimental dental restorative materials as a reinforcing filler due to its high aspect ratio, forming interfacial solid bonds with the polymer matrix. The relatively high cation exchange capacity and layered structure of MMT pave the way as a medium for drug delivery systems. Furthermore, the incorporation of ions such as calcium, fluoride, silver, and zinc potentially increase the remineralization properties and antibacterial properties of MMT-based dental materials. Despite modern dental restorative materials having advanced significantly with innovations in material nanoscience, challenges such as biocompatibility, inadequate mechanical properties, marginal leakage, polymerization shrinkage, aesthetic concerns, and overall costs remain to be addressed. This review investigates the potential of montmorillonite (MMT) in dentistry, emphasizing its distinctive properties, composite formulations, and applications. It assesses the current state of research in these areas, aiming to highlight existing gaps in knowledge, emerging trends, and lesser-known applications of MMT-based materials. The review underscores MMT's promise as an alternative material across various dental applications while noting the scarcity of research on completed products and in vivo clinical studies.

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Reduction of polymerization shrinkage in methyl methacrylate-montmorillonite composites

Cited by 9 publications

References 8 publications

The effect of clay modification on the mechanical properties of poly(methyl methacrylate)/organomodified montmorillonite nanocomposites prepared byin sitususpension polymerization

The effect of clay modification on the mechanical properties of poly(methyl methacrylate)/organomodified montmorillonite nanocomposites prepared byin sitususpension polymerization

Morphology and elastic modulus of novel poly[oligo(ethylene glycol) diacrylate]‐montmorillonite nanocomposites

Montmorillonite in dentistry: a review of advances in research and potential clinical applications

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