scholarly journals EFFECT OF SILANE COUPLING AGENT CONTENT ON MECHANICAL PROPERTIES OF HYDROXYAPATITE/POLY(METHYL METHACRYLATE) DENTURE BASE COMPOSITE

2021 ◽  
pp. 37-45
Author(s):  
Jamal Moammar ALDABIB
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Methyl Methacrylate ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Flexural Modulus ◽  
Denture Base ◽  
Poly Methyl Methacrylate ◽  
Silane Coupling ◽  
Base Composite

In removable prosthodontics, poly(methyl methacrylate) (PMMA) is the most suitable for the construction of denture bases. Intra-orally, the subjected stress intensity during the function accelerate the fracture of acrylic resin denture bases. Extra-orally, fracture occurs when dentures are accidentally dropped on a hard surface. The aim of the current study was to investigate the effect of coupling agent concentration on the mechanical properties of Hydroxyapatite/Poly(methyl methacrylate) (HA/PMMA) denture base composite. The Hydroxyapatite (HA) treated with four different ratios (i.e. 0, 5, 7 and 10 wt%) of 3-(trimethoxysily) propyl methacrylate (γMPS) silane coupling agent was added into the PMMA matrix. The mechanical performance of the composite was evaluated by conducting fracture toughness, flexural and tensile tests. An improvement of 13.83% and 9.62% in the tensile and flexural strength respectively, was achieved. The tensile and flexural modulus of the composite increased by 19.04% and 12.5% respectively. A significant improvement of 29.26% in the fracture toughness was observed at 10 wt% of γ-MPS. 10 wt% of γ-MPS is the optimum amount of coupling agent for obtaining balanced mechanical properties.

Preparation and Properties of Poly Methyl Methacrylate/Lanthanum Hexaboride Nanocomposites

2010 ◽  
Vol 150-151 ◽  
pp. 703-706 ◽  
Author(s):  
Li Jie Hu ◽  
Guang Hui Min ◽  
Xue Yang
Keyword(s):  
Electron Microscopy ◽  
Methyl Methacrylate ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Organic Matrix ◽  
Lanthanum Hexaboride ◽  
Inorganic Nanoparticles ◽  
Cubic Phase ◽  
Poly Methyl Methacrylate ◽  
Silane Coupling

Lanthanum hexaboride (LaB6) nanopowders were synthesized at 1200 for 2 hours in the vacuum hot resistor furnace with lanthanum chloride (LaCl3) and sodium borohydride (NaBH4). As-prepared nanopowders were surface modified first by silane coupling agent and then were used as fillers for PMMA to fabricate poly methyl methacrylate (PMMA)/LaB6 nanocomposites via melt extrusion using a twin-screw extruder. X-ray powder diffraction (XRD), transmission electron microscopy (TEM) indicated a pure cubic phase with the average size of 70 nm. Fourier transform infrared spectra (FTIR) proved silane coupling agent was grafted onto nanoparticles. The comparision of field emission scanning electron microscopy (FESEM) of unmodified and modified nanoparticles showed that surface modification prevented agglomeration of nanoparticles, making more evenly-distributed inorganic nanoparticles within organic matrix as LaB6 mass fraction equaled 0.010%. In addition, LaB6 nanoparticles played a vital role in the absorption range from ultraviolet (UV) to NIR and the composite with a higher content of LaB6 was beneficial for rejecting heat.

scholarly journals Preparation and characterization of attapulgite microcapsules coated with acrylic polymer

Polimery ◽  
2021 ◽  
Vol 66 (2) ◽  
pp. 112-118
Author(s):  
Lining Song ◽  
Zhenxu Li ◽  
Lina Yang ◽  
Ning Wang ◽  
Jie Zhao ◽  
...  
Keyword(s):  
Particle Size ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Flame Retardant ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Core Shell ◽  
Shell Material ◽  
Poly Methyl Methacrylate ◽  
Silane Coupling

The attapulgite core-shell microcapsule type flame retardant was prepared by in situ polymerization. Attapulgite (ATP) was used as a core material with poly(methyl methacrylate) (PMMA) and poly(methyl methacrylate-co-acrylic acid) [P(MMA-co-AA)] as shell materials. The attapulgite was modified by the silane coupling agent. The effects of different shell materials and modification methods on the structure and properties of attapulgite core-shell microcapsules were studied by scanning electron microscopy, particle size distribution, infrared analysis and thermogravimetric analysis. The results showed that the coating effect was best when the amount of silane coupling agent was 1% of the attapulgite mass. The particle size of the microcapsule prepared with PMMA as shell material was uniform and the coating efficiency was better. After the copolymerization of acrylic acid (AA) in MMA shell materials, the cladding efficiency was improved. At the same time, the thermal decomposition temperature of the microcapsule shell material was greatly reduced, which is beneficial to the performance of attapulgite flame retardant.

scholarly journals Effect of nano- and micro-alumina fillers on some properties of poly(methyl methacrylate) denture base composites

2018 ◽  
Vol 83 (1) ◽  
pp. 75-91 ◽  
Author(s):  
Fathie Kundie ◽  
Che Azhari ◽  
Zainal Ahmad
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Fracture Toughness ◽  
Methyl Methacrylate ◽  
Water Absorption ◽  
Nano Particles ◽  
Nano Composites ◽  
Al2o3 Nanoparticles ◽  
Denture Base ◽  
Poly Methyl Methacrylate

This research investigated the effects of alumina (Al2O3) micro- and nano-particles on poly(methyl methacrylate) (PMMA) denture base. Al2O3 was surface treated using (3-methacryloxypropyl)trimethoxysilane (?-MPS), added to methyl methacrylate (MMA), and mixed with PMMA powder. The filler volume fractions in the micro-composites were 0.5, 1, 2, 5 and 7 wt. %, whereas those in the nano-composites were 0.13, 0.25, 0.5, 1, 2 and 5 wt. %. The treated fillers were examined using Fourier transform infrared spectroscopy (FTIR). The influence of filler size and loading on mechanical properties was studied using fracture toughness and flexural tests. The thermal stability of the PMMA/Al2O3 composites was investigated using thermogravimetric analysis (TGA). In addition, the water absorption and solubility characteristic of the prepared composites was also investigated. The FTIR spectra showed new absorption bands, indicating the occurrence of surface modifications. Both micro- and nanoscale particles showed increased fracture toughness. The maximum value of 2.02 MPa?m1/2 was achieved with the addition of 0.5 wt. % nano-Al2O3, which accounts for a 39 % increase. In contrast to the flexural strength, the flexural modulus improved with increasing filler content. The micro-composites showed higher thermal stability than nano-composites. The water absorption and solubility of the prepared composites were slightly higher than those of the control. The use of low concentrations of Al2O3 nanoparticles may be of considerable interest in future studies to improve the mechanical properties of PMMA denture base.

Effect of Polymeric Coupling Agent on Mechanical Properties of Kenaf Fiber / Polystyrene Composites

2012 ◽  
Vol 268-270 ◽  
pp. 127-133
Author(s):  
Chen Zheng ◽  
Yan Yan Xu ◽  
Takahiko Kawai ◽  
Shin-ichi Kuroda
Keyword(s):  
Mechanical Properties ◽  
Water Uptake ◽  
Uptake Rate ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Solvent System ◽  
Kenaf Fiber ◽  
Silane Coupling ◽  
Polymeric Silane ◽  
Remarkable Reduction

In order to improve the properties and the processability of kenaf fiber (KF) / polystyrene (PS) composites, the newly synthesized polymeric silane coupling agent (CA) was utilized and evaluated. KFs were reacted with CA in the melt system and in the solvent system. The composites reinforced by the modified KF showed enhanced mechanical properties compared with those reinforced by the unmodified KF. The effect was especially remarkable when the KF was modified with CA in the solvent system. As the CA content increases, the surface of KF recovered from the composites showed the higher Si / C ratio indicating the good reaction between KF and CA. The modified composites also showed a remarkable reduction in water uptake rate.

Effect of poly (methyl methacrylate)-grafted-talc content on mechanical properties and thermal degradation of poly (vinyl chloride) composites

2012 ◽  
Vol 32 (4-5) ◽  
pp. 275-282 ◽  
Author(s):  
Azman Hassan ◽  
Noor Izyan Syazana Mohd Yusoff ◽  
Aznizam Abu Bakar
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Vinyl Chloride ◽  
Flexural Modulus ◽  
Nitrogen Atmosphere ◽  
Radical Initiation ◽  
Poly Methyl Methacrylate ◽  
Poly Vinyl Chloride ◽  
Free Radical Initiation ◽  
The Impact

Abstract The influence of talc and poly (methyl methacrylate) (PMMA)-grafted (g)-talc on the mechanical properties of poly (vinyl chloride) (PVC) was investigated. The graft copolymerization was carried out under nitrogen atmosphere, using the free radical initiation technique. The blend formulations were first dry blended using a mixer before being milled into sheets on a two-roll mill at 165°C, and then hot pressed into composites at 190°C. The flexural modulus of both composites increased with increasing filler content from 0 to 20 part per hundred resin (phr), however the increment of grafted (57.7%) was higher than ungrafted composites (48.5%). A similar trend has also been observed for thermal stability. The impact strength of grafted was increased by 45.82%, whereas 18.96% in reduction was observed for the ungrafted composites. The decrement of flexural strength by 16.6% and 21.1% of grafted and ungrafted, respectively, has also shown the improvement in mechanical properties of grafted composites.

Study on the Application of Silane Coupling Agent in Rice Straw/Poly(butylene Succinate) Composites

2011 ◽  
Vol 675-677 ◽  
pp. 361-364 ◽  
Author(s):  
Yang Zhao ◽  
Jian Hui Qiu ◽  
Hui Xia Feng ◽  
Guo Hong Zhang ◽  
Liang Shao
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Rice Straw ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Fracture Strain ◽  
Molding Machine ◽  
Butylene Succinate ◽  
Silane Coupling ◽  
Properties Of Composites

Rice straw/Poly(butylene succinate)(PBS) composites were prepared by injection molding machine. The influence of content and particle size of rice straw on the mechanical properties of composites indicated that with the increase of rice straw content the tensile strength and fracture strain of the composites was decreased. With the same content of rice straw, the smaller particle size, the more obvious decreased. The influence of dosage of silane coupling agent(SCA) on the composites was studied, the result indicated that with the increase of SCA content, the interface of composite materials significantly improved, the Young’s modulus increased 362% after rice straw was treated by SCA. Thermal analysis showed that the adding of coupling agent didn’t undermine the thermodynamic stability of the composites.

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