Effect of Silane Coupling Agents on Mechanical Properties of Nano-SiO2 Filled High-Density Polyethylene Composites

2007 ◽  
Vol 555 ◽  
pp. 479-484 ◽  
Author(s):  
D. Stojanović ◽  
P. S. Uskoković ◽  
I. Balać ◽  
V.J. Radojević ◽  
R. Aleksić
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Particle Surface ◽  
High Density ◽  
Coupling Agents ◽  
Stress Concentrations ◽  
Silane Coupling Agents ◽  
Silane Coupling ◽  
The Matrix ◽  
Indentation Tests

Composites with nano-SiO2 particles and high density polyethylene (HDPE) matrix were produced by hot pressing with various particle contents and particle surface treatment using commercially available silane coupling agents: γ-methacryloxypropyltrimethoxy silane and γ- glycidyloxypropyltrimethoxysilane. The influence of the particle treatment on the mechanical properties of composites was determined by compression and indentation tests. Additionally, numerical analysis was performed in order to calculate Young’s modulus and stress concentrations for various particle contents in order to provide reference data by simulating micro- and macro particle composites with perfect bonding to the matrix.

Tuning the Mechanical Properties of High-Density Polyethylene by ECAE Process

2015 ◽  
Author(s):  
Catalin Fetecau ◽  
Felicia Stan ◽  
Laurentiu Sandu ◽  
Florin Susac
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Equal Channel Angular Extrusion ◽  
Morphological Changes ◽  
Longitudinal Axis ◽  
High Density ◽  
Scanning Calorimetry ◽  
Plastic Deformations ◽  
The Third ◽  
Indentation Tests

This paper investigates the ability of the equal channel angular extrusion (ECAE) process to induce morphological changes and hence tune the mechanical properties of high-density polyethylene (HDPE). In this study, differential scanning calorimetry (DSC), compression and cylindrical macro-indentation tests have been used to investigate the evolution of the mechanical properties of HDPE processed by ECAE up to four passes via route BC, i.e. counter clockwise 90° billet rotation about its longitudinal axis. It was found that the ECAE process induces significant plastic deformations with changes in the crystalline structure. The ECAE process increased the HDPE crystallinity by 10 to 15%. The number of ECAE passes has a significant effect on the magnitude of the mechanical properties especially on the elastic modulus and yield stress. Young’s modulus and yield strength decreased with increasing the number of ECAE passes and reached a stationary state after the third pass.

Effect of silane coupling agent on the mechanical properties of nitrile butadiene rubber (NBR)/organophilic montmorillonite (OMMT) nanocomposites

2016 ◽  
Vol 23 (3) ◽  
pp. 277-282 ◽  
Author(s):  
Ru Liang Zhang ◽  
Li Fen Zhao ◽  
Yu Dong Huang ◽  
Li Liu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Analysis ◽  
Coupling Agents ◽  
Butadiene Rubber ◽  
Silane Coupling Agents ◽  
Nitrile Butadiene Rubber ◽  
Melt Compounding ◽  
Silane Coupling ◽  
Organophilic Montmorillonite ◽  
Ommt Clay

AbstractThe effect of coupling agents on the mechanical properties of nitrile butadiene rubber (NBR)/organophilic montmorillonite (OMMT) clay nanocomposites was studied using three different types of silane coupling agents, which were γ-(aminopropyl)triethoxysilane, γ-(mercaptopropyl) triethoxy silane, and bis-[(γ-triethoxy silane)proply] tetrasulfur. The NBR/OMMT nanocomposites were prepared via the melt compounding with OMMT clay. The effect of silane coupling agents on the dispersion of OMMT in the polymer matrix was studied by X-ray diffraction. Dynamic mechanical analysis was employed to investigate the mechanical properties change induced by the silane coupling agents. The results suggest improved mechanical properties for the nanocomposites with coupling agents of γ-(mercaptopropyl) triethoxy silane and bis-[(γ-triethoxy silane)proply] tetrasulfur, whereas reduced mechanical properties were observed for nanocomposites with γ-(aminopropyl)triethoxysilane.

Effect of different silane coupling agents on cryogenic properties of silica-reinforced epoxy composites

2016 ◽  
Vol 30 (1) ◽  
pp. 24-37 ◽  
Author(s):  
Hongyu Wang ◽  
Tao Sun ◽  
Cong Peng ◽  
Zhanjun Wu
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Tensile Properties ◽  
Silica Content ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Silane Coupling ◽  
The Matrix ◽  
Dispersion State ◽  
The Difference

Epoxy-based composites containing silica modified by various silane coupling agents (SCAs) were prepared. The effect of the SCAs and the silica content on the thermal, mechanical properties, and fracture toughness of the nanocomposites was investigated. The particle size and dispersion state of the modified silica particles in the matrix were determined by transmission electron microscopy. The modification of silica with SCAs was verified by Fourier transform infrared spectroscopy. The specific tensile properties at ambient temperature (AT, 298 K) were compared with those at cryogenic (LT, 77 K) condition for silica content of 1−5 wt%. The effect of certain types of coupling agents on the thermal properties of the composites was also investigated. The Tg of all amino-silane-modified composites tended to be improved at low silica contents, while that of epoxy-silane-modified composites seemed to be enhanced further at high silica content. The tensile properties of the nanocomposites both at AT and LT tended to be enhanced at lower silica content, especially the failure strain. The fracture toughness ( KIC) turned out to be better enhanced by coupling agents at LT. The difference of the toughening mechanism at AT and LT was examined according to the morphology of the fracture surfaces using the scanning electron microscopy.

The Effect of Surface Modification of TiO2 on Mechanical Properties of Polyethylene Composite Film

2010 ◽  
Vol 93-94 ◽  
pp. 300-303 ◽  
Author(s):  
N. Tangchantra ◽  
Jittiporn Kruenate ◽  
Chuanchom Aumnate ◽  
Thammarak Sooksomsong
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Composite Films ◽  
Titanium Isopropoxide ◽  
Nano Particles ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Polyethylene Composite ◽  
Silane Coupling ◽  
Measurement Surface

To achieve a proper dispersion of nano-particles polymer matrix and to yield a better compatibility between the nano-particles and polymeric material, the use of different coupling agents for surface modification of nano-particle is recommended. In this research, surface of TiO2 was modified by hydrolytic condensation of titanium isopropoxide with three different silane coupling agents, hexadecyl trimethoxysilane (HTMS), triethoxyvinylsilane (TEVS) and aminopropyl trimethoxysilane (APS). The grafting of silane coupling agents on the TiO2 nano-particles surface was characterized using TGA and FTIR techniques. Mechanical properties of polyethylene composite films were evaluated via tensile strength measurement. Surface morphology of the particle was studied by SEM and TEM. The result showed that surface treatment TiO2 nano-particles with TEVS could improve dispersibility of TiO2 and showed the optimum mechanical properties.

Influence of silane/MaPE dual coupling agents on the rheological and mechanical properties of sawdust/rubber/HDPE composites

Holzforschung ◽  
2019 ◽  
Vol 73 (6) ◽  
pp. 605-611
Author(s):  
Xinwu Xu ◽  
Ling Chen ◽  
Jingquan Han ◽  
Xianxu Zhan
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Bending Strength ◽  
Extrusion Process ◽  
High Density ◽  
Coupling Agents ◽  
Ground Tire Rubber ◽  
Bending Modulus ◽  
Coupling System ◽  
Recycled Rubber

Abstract Proper utilization of recycled rubber is of high environmental and resource concern. In this study, a composite (COMP) was created based on high-density fiberboard sawdust (HDFS), ground tire rubber (GTR) particles and virgin high-density polyethylene (HDPE) with the ratio of HDFS:GTR:HDPE=30:21:49 and with 1% PE wax as lubricant. A dual coupling agent system, i.e. bis-(triethoxysilylpropyl) tetrasulfide (TESPT, up to 5% based on the COMP total weight) together with maleated polyethylene (MaPE, 3, 5 and 8% based on the COMP weight), was applied. The rheological properties of the hybrid during the extrusion process was evaluated in a HAAKE miniLab rheometer, and the bending and tensile properties of injected COMP were tested. The results showed that addition of MaPE and TESPT has an evident influence on the shear viscosity and stress of the COMP fluid, and the two coupling chemicals have synergetic effects. Increased content of MaPE and/or TESPT improved the tensile and bending strength of the COMP, while excessive addition of TESPT (over 1%) decreased the bending modulus. To conclude, a dual coupling system, 5% MaPE plus 1% TESPT, seems to be advantageous for the COMP behavior.

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