Synthesis and properties of poly(methyl methacrylate)/montmorillonite (PMMA/MMT) nanocomposites

Li, Yan; Zhao, Baojun; Xie, Shaoxiong; Zhang, Shimin

doi:10.1002/pi.1121

Cited by 98 publications

(59 citation statements)

References 15 publications

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“…It is worth pointing that the increase of storage modulus to nanocomposites confirms high resistance of organoclay against matrix deformation 25,27 . Also, the temperature range of elastic response of nanocomposite is higher than of pure PMMA.…”

Section: Discussionmentioning

confidence: 71%

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Thermal properties of poly (methyl methacrylate)/organomodified montmorillonite nanocomposites obtained by in situ photopolymerization

et al. 2013

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The organoclay/poly(methyl methacrylate) (PMMA) nanocomposites were prepared by in situ photopolymerization method using two solvents, ethanol and acetonitrile. The influences of organoclay loading, solvent nature and length of attached surfactant (C8 or C16) on thermal and mechanical properties were studied by thermogravimetric analysis and dynamic mechanical analysis. Alkylammonium surfactants with C8 and C16 chain lengths were evaluated as clay modifiers. All the nanocomposites prepared in acetonitrile exhibited improvement in their thermal stability, mainly due to the interaction between the clay and the polymer which is maximized by the exfoliated clay structure. In the case of PMMA and nanocomposites synthesized in ethanol, the thermal stability of polymer and nanocomposites remained practically the same once the clay structure is predominantly of the intercalated type. In comparison with pure PMMA, glass transition temperature and storage modulus of polymer are notably increased by the presence of clay. It was found that the chain length of surfactant attached to the SWy-1 clay affects the Tg values. Glass transition temperatures of nanocomposites SWy-1-C16/PMMA were significantly higher than the values obtained for nanocomposites SWy-1-C8/ PMMA. This can be attributed to the modifying agent C16, which has a greater hydrophobic chain length. The organic tail can provide a better dispersion of the MMA monomer in the organoclay, resulting in a nanocomposite with predominant exfoliated structure. Another significant factor to be considered was the effect of solvent used in the nanocomposite preparation. Considering nanocomposites with the same chain length (C8 or C16), Tg values obtained for nanocomposites prepared with ethanol is higher than those observed for those prepared in acetonitrile. This was attributed to the influence of the average molecular weight; once the nanocomposites prepared in ethanol exhibited higher polymeric chains.

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Section: Discussionmentioning

confidence: 71%

“…The Tg then decreases with 5 wt % clay content. It is evident from the Figure 4 that T g were significantly shifted to higher temperature as a function of clay loading 10,25 . Table 1 shows glass transition temperature and molecular weight (M w ) obtained for PMMA and its composites.…”

Section: Damping Factor (Tan δ)mentioning

confidence: 88%

Thermal properties of poly (methyl methacrylate)/organomodified montmorillonite nanocomposites obtained by in situ photopolymerization

et al. 2013

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“…This means that the presence of the organoclay leads to more rigid composites and that the organoclay filler limits the mobility of the polymeric chains at the clay-polymer interface, promoting higher resistance of the material against deformation. 14,15 This is a desirable condition for dental composites, that should have intermediate properties for hardness and deforming capacity, approaching the behaviour of the material to the prediction of the Hooke's Law. 15 …”

Section: Dynamical Mechanical Analysis (Dma)mentioning

confidence: 99%

“…14,15 This is a desirable condition for dental composites, that should have intermediate properties for hardness and deforming capacity, approaching the behaviour of the material to the prediction of the Hooke's Law. 15 …”

Section: Dynamical Mechanical Analysis (Dma)mentioning

confidence: 99%

Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin

et al. 2016

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Experimental dental resins composed of triethyleneglycol dimethacrylate, urethane dimethacrylate, ethoxylated bisphenol-A-dimethacrylate and bisphenol A glycidyl methacrylate containing an organoclay as filler were prepared by photopolymerization. The addition of organoclay fillers results in slower polymerization rates (0.59 and 0.24 mol L -1 min -1 , for the formulations without and with 15% of organoclay, respectively) and lower degrees of conversion (0.50 and 0.35 for the formulations without and with 15% of organoclay), as determined by photocalorimetry. The influence of the organoclay on the thermal and mechanical properties of the resins was evaluated using thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) techniques. The (tan δ) and E´ curves indicate the formation of more rigid materials and the damping curve data indicates more homogeneous materials. An increase of storage modulus, E', was observed for composites with the higher organoclay filler contents. These effects are due to the higher viscosity of the systems with organoclay, resulting in a lower mobility of the radicals during the propagation step of polymerization, as well as to the scattering of the incident photopolymerizing radiation, which lowers the amount of initiation centres.

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“…Organomontmorillonite (OMMT) is one of the commercial organoclays that has been widely utilized as reinforcing filler in polymer nanocomposites [1][2][3]. Numerous authors have reported on the enhancement in strength and modulus [4][5][6], gas barrier [7] and flame retardant properties [8][9] of polymer/OMMT nanocomposites. In recent years, attention has been devoted to the nanocomposites based on biodegradable polymers and organoclay due to the increasing awareness on the plastic waste pollution.…”

Section: Introductionmentioning

confidence: 99%

Reactive processing of maleic anhydride-grafted poly(butylene succinate) and the compatibilizing effect on poly(butylene succinate) nanocomposites

Phua¹,

Chow²,

Ishak³

2013

Express Polym. Lett.

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Abstract. In this study, maleic anhydride-grafted poly(butylene succinate) (PBS-g-MA) was synthesized via reactive meltgrafting process using different initiator contents. The grafting efficiency was increased with the initiator content, manifested by the higher degree of grafting in PBS-g-MA. The grafting reaction was confirmed through Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. Then, PBS-g-MA was incorporated into organo-montmorillonite (OMMT) filled poly(butylene succinate) (PBS) nanocomposites as compatibilizer. Mechanical properties of PBS nanocomposites were enhanced after compatibilized with PBS-g-MA, due to the better dispersion of OMMT in PBS matrix and the improved filler-matrix interfacial interactions. This was verifiable through X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Differential scanning calorimetry (DSC) showed that the degree of crystallinity and melting temperature increased after addition of PBS-g-MA. However, the presence of PBS-g-MA did not favor the thermal stability of the nanocomposites, as reported in the thermogravimetry (TGA).

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Synthesis and properties of poly(methyl methacrylate)/montmorillonite (PMMA/MMT) nanocomposites

Cited by 98 publications

References 15 publications

Thermal properties of poly (methyl methacrylate)/organomodified montmorillonite nanocomposites obtained by in situ photopolymerization

Thermal properties of poly (methyl methacrylate)/organomodified montmorillonite nanocomposites obtained by in situ photopolymerization

Effect of the loading of organomodified clays on the thermal and mechanical properties of a model dental resin

Reactive processing of maleic anhydride-grafted poly(butylene succinate) and the compatibilizing effect on poly(butylene succinate) nanocomposites

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