Characterization of silylated modified clay nanoparticles and its functionality in PMMA

Bee, Soo Ling; Abdullah, Mohd Aidil Adhha; Mamat, Mazidah; Bee, Soo Tueen; Sin, Lee Tin; Hui, David; Rahmat, Abdul Razak

doi:10.1016/j.compositesb.2016.10.084

Cited by 58 publications

(38 citation statements)

References 56 publications

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“…The result showed that organo-MMT layers are well exfoliated and dispersed into the polymer matrix. Poly(methyl methacrylate) (PMMA) composites with an intercalated structure were successfully fabricated by Bee et al [84] using melt blending with a functionalized pristine sodium MMT and organically-modified Cloisite ® 20A (BYK Additives & Instrument, Wesel, Germany). The composite exhibited superior thermal stability and tensile strength compared to neat PMMA and PMMA/pristine sodium MMT composites.…”

Section: Melt-blending Methodsmentioning

confidence: 99%

A Review of the Synthesis and Applications of Polymer–Nanoclay Composites

et al. 2018

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Recent advancements in material technologies have promoted the development of various preparation strategies and applications of novel polymer–nanoclay composites. Innovative synthesis pathways have resulted in novel polymer–nanoclay composites with improved properties, which have been successfully incorporated in diverse fields such as aerospace, automobile, construction, petroleum, biomedical and wastewater treatment. These composites are recognized as promising advanced materials due to their superior properties, such as enhanced density, strength, relatively large surface areas, high elastic modulus, flame retardancy, and thermomechanical/optoelectronic/magnetic properties. The primary focus of this review is to deliver an up-to-date overview of polymer–nanoclay composites along with their synthesis routes and applications. The discussion highlights potential future directions for this emerging field of research.

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Section: Melt-blending Methodsmentioning

confidence: 99%

A Review of the Synthesis and Applications of Polymer–Nanoclay Composites

et al. 2018

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“…There are also few researches on their structural confinement properties and on the mechanisms that underlie their interactions with polymer. In 2017, Bee et al investigated the effect of Cloisite Na and Cloisite 20 on the morphology, mechanical and thermal properties of the resulting poly (methyl methacrylate) (PMMA) nanocomposites prepared using a Brabender mixer [35]. They found that Cloisite 20 shows better compatibility with PMMA compared with Cloisite Na.…”

Section: Introductionmentioning

confidence: 99%

Clay-Polymer Nanocomposites Prepared by Reactive Melt Extrusion for Sustained Drug Release

Liu¹,

et al. 2020

Pharmaceutics

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Clay–polymer nanocomposites have exhibited a great potential as carriers for controlled release drug delivery. This study aims to prepare exfoliated montmorillonite–Eudragit RS nanocomposites using reactive melt extrusion and investigate the influence of claying loading, clay types (sodium montmorillonite (Cloisite Na) vs. organomodified montmorillonite (Cloisite 20)) on clay–polymer interactions and drug release properties. The clays were used as the filler material at various levels in Eudragit RS and theophylline was used as the active pharmaceutical ingredient. The resulting structure of the nanocomposites was characterized using TEM (transmission electron microscopy) and XRPD (X-ray powder diffraction). The hygroscopicity of the nanocomposites was investigated using DVS (dynamic vapor sorption). The effect of the interfacial interaction between the polymer and clay sheet, the clay loading as well as the clay type on the drug release behavior were further studied by dissolution testing. TEM and XRPD data show that when the clay content is increased from 5% to 15% by weight, the nanocomposite’s structure switches from a fully exfoliated state to intercalated structures or partial exfoliation with stacked clay layers. FT-IR (fourier transform infrared spectroscopy) and ssNMR (solid-state NMR) results suggest that Cloisite Na and Cloisite 20 layers exhibit different interaction strengths with polymer networks by creating compacted complex structures. The addition of nanoclay in the formulation could robustly adjust drug release profiles, and the clay concentration and type are important factors that affect the crossing-linking density of the nanocomposites by adjusting the drug release properties. This study indicates that the clay–Eudragit RS nanocomposites provide an improved oral controlled drug delivery system that minimizes the drug dosing frequency, potentially leading to improved patient compliance.

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“…Understanding the chemical responses of polymers to mechanical loading are crucial for wide-range research areas in polymer science and technology, as well as for designs of new types of stress-responsive and energy-transduction polymers [1][2][3]. Mechanical loading, i.e., using high pressure, mechanical forces or ultrasound [4][5][6], provides an effective stimulus approach for chemists to design/fabricate novel materials [7][8][9], similar to those using heat, light or electricity [10][11][12]. Various types of stress-responsive and energy-transduction polymers have been produced based on the chemical reactions of molecule bonds in response to the external stresses or forces, including flow-induced mechanochemistry of polymers in solution [13], mechanically-induced dichroism [14,15] and ultrasonication-induced chain scissions in polymers [16].…”

Section: Introductionmentioning

confidence: 99%

A strategy for modelling mechanochemically induced unzipping and scission of chemical bonds in double-network polymer composite

Shi

et al. 2019

Composites Part B: Engineering

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A molecular mechanics model for covalent and ionic double-network polymer composites was developed in this study to investigate mechanisms of mechanochemically induced unzipping and scission of chemical bonds. Morse potential function was firstly applied to investigate mechanical unzipping of the covalent bonds, and then stress-dependent mechanical energy for the interatomic covalent bonds was discussed. A new mechanochemical model was formulated for describing the mechanically induced ionic bond scissions based on the Morse potential model and equations for electrostatic forces. Based on this newly proposed model, mechanochemical behaviors of several common interatomic interaction types (e.g.of the ionic bonds have been quantitatively described and analyzed. Finally, mechanochemical unzipping of the covalent bonds and dissociation of the ionic bonds have been characterized and analyzed based on the molecular mechanics model, which has well predicted the chemical and mechanochemical activations in the covalent and ionic double-network polymer 2 composites.

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Characterization of silylated modified clay nanoparticles and its functionality in PMMA

Cited by 58 publications

References 56 publications

A Review of the Synthesis and Applications of Polymer–Nanoclay Composites

A Review of the Synthesis and Applications of Polymer–Nanoclay Composites

Clay-Polymer Nanocomposites Prepared by Reactive Melt Extrusion for Sustained Drug Release

A strategy for modelling mechanochemically induced unzipping and scission of chemical bonds in double-network polymer composite

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