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.

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 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.

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.

Preparation of Nano-SiO2 Particles Modified by Fluorine Silane Coupling Agent

2014 ◽  
Vol 915-916 ◽  
pp. 709-712
Author(s):  
Xiao Li Wei ◽  
Fa Xing Zhang
Keyword(s):  
Particle Size ◽  
Surface Modification ◽  
Double Bond ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Coupling Agents ◽  
Test Results ◽  
Dsc Analysis ◽  
Dispersion Effect ◽  
Silane Coupling

In this paper nanoSiO2 particles were prepared with the surface grafted fluorine coupling agents and double bond by using surface modification technology. Dispersion effect of nanoSiO2 particles were studied in different solvents ultrasound cavitation. Test results showed in infrared spectroscopy, TEM and laser particle size distribution analyzer that both F8261 and KH-570 have been grafted onto the surface of nanoSiO2 , particle size and distribution of nanoSiO2 after modified by the two coupling agent became smaller and more narrow; Tg-DSC analysis showed that when the amount of of the coupling agent is up to 10%, fluorine coupling agent and double bond grafted onto surface of nanoSiO2 particles reach the saturation.

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