Synergistic Effects of Acrylic/Silica Armored Structured Nanoparticles on the Toughness and Physicomechanical Properties of Epoxy Polymers

2021 ◽  
Author(s):  
Ali Gharieh ◽  
Mobina Moghadas ◽  
Mohammadreza Pourghasem
Keyword(s):  
Synergistic Effects ◽  
Physicomechanical Properties ◽  
Epoxy Polymers

scholarly journals A systematic study on the synergistic effects of MWCNTs and core–shell particles on the physicomechanical properties of epoxy resin

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ali Gharieh ◽  
Mir Saeed Seyed Dorraji
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Epoxy Resin ◽  
Tensile Properties ◽  
Synergistic Effects ◽  
Average Particle Size ◽  
Physicomechanical Properties ◽  
Core Shell ◽  
Average Particle ◽  
Impact Modifier

AbstractHere, core–shell impact modifier particles (CSIMPs) and multiwalled carbon nanotubes (MWCNs) were used as reinforcing agents for improving the toughness and tensile properties of epoxy resin. For this purpose, emulsion polymerization technique was exploited to fabricate poly(butyl acrylate-allyl methacrylate) core-poly(methyl methacrylate-glycidyl methacrylate) shell impact modifier particles with an average particle size of 407 nm. It was revealed that using a combination of the prepared CSIMPs and MWCNTs could significantly enhance the toughness and tensile properties of the epoxy resin. Also, it was observed that the dominant factors for improving the fracture toughness of the ternary composites are crack deflection/arresting as well as enlarged plastic deformation around the growing crack tip induced by the combination of rigid and soft particles. The Response Surface Methodology (RSM) with central composite design (CCD) was utilized to study the effects of the amounts of CSIMPs and MWCNTs on the physicomechanical properties of the epoxy resin. The proposed quadratic models were in accordance with the experimental results with correlation coefficient more than 98%. The optimum condition for maximum toughness, elastic modulus, and tensile strength was 3 wt% MWCNT and 1.03 wt% CSIMPs. The sample fabricated in the optimal condition indicated toughness, elastic modulus, and tensile strength equal to 2.2 MPa m1/2, 3014.5 MPa, and 40.6 MPa, respectively.

Physicomechanical Properties of Binders Based on Mixtures of Epoxy Polymers and Oligosulfons

2020 ◽  
Vol 13 (2) ◽  
pp. 129-135
Author(s):  
Yu. S. Kochergin ◽  
T. I. Grigorenko ◽  
N. Wang
Keyword(s):  
Physicomechanical Properties ◽  
Epoxy Polymers

Morphology of High-Performance Rigid-Rod Polymer Fibers and Molecular Composites

1989 ◽  
Vol 47 ◽  
pp. 338-339
Author(s):  
W.W. Adams ◽  
S. J. Krause
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Liquid Crystalline ◽  
Molecular Level ◽  
Synergistic Effects ◽  
Tensile Modulus ◽  
Commercial Development ◽  
The Matrix ◽  
Molecular Composites ◽  
Rigid Rod

Rigid-rod polymers such as PBO, poly(paraphenylene benzobisoxazole), Figure 1a, are now in commercial development for use as high-performance fibers and for reinforcement at the molecular level in molecular composites. Spinning of liquid crystalline polyphosphoric acid solutions of PBO, followed by washing, drying, and tension heat treatment produces fibers which have the following properties: density of 1.59 g/cm3; tensile strength of 820 kpsi; tensile modulus of 52 Mpsi; compressive strength of 50 kpsi; they are electrically insulating; they do not absorb moisture; and they are insensitive to radiation, including ultraviolet. Since the chain modulus of PBO is estimated to be 730 GPa, the high stiffness also affords the opportunity to reinforce a flexible coil polymer at the molecular level, in analogy to a chopped fiber reinforced composite. The objectives of the molecular composite concept are to eliminate the thermal expansion coefficient mismatch between the fiber and the matrix, as occurs in conventional composites, to eliminate the interface between the fiber and the matrix, and, hopefully, to obtain synergistic effects from the exceptional stiffness of the rigid-rod molecule. These expectations have been confirmed in the case of blending rigid-rod PBZT, poly(paraphenylene benzobisthiazole), Figure 1b, with stiff-chain ABPBI, poly 2,5(6) benzimidazole, Fig. 1c A film with 30% PBZT/70% ABPBI had tensile strength 190 kpsi and tensile modulus of 13 Mpsi when solution spun from a 3% methane sulfonic acid solution into a film. The modulus, as predicted by rule of mixtures, for a film with this composition and with planar isotropic orientation, should be 16 Mpsi. The experimental value is 80% of the theoretical value indicating that the concept of a molecular composite is valid.

A new model of synergistic effects of alcohol and high-fat diet on hepatic injury

2010 ◽  
Vol 48 (01) ◽  
Author(s):  
E Gäbele ◽  
K Dostert ◽  
C Dorn ◽  
C Hellerbrand
Keyword(s):  
High Fat Diet ◽  
Hepatic Injury ◽  
Synergistic Effects ◽  
High Fat ◽  
New Model
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