Mechanical properties and fracture behavior of high‐performance epoxy nanocomposites modified with block polymer and core–shell rubber particles

2019 ◽  
Vol 137 (11) ◽  
pp. 48471 ◽  
Author(s):  
Ankur Bajpai ◽  
Bernd Wetzel ◽  
Andreas Klingler ◽  
Klaus Friedrich
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Fracture Behavior ◽  
Core Shell ◽  
Epoxy Nanocomposites ◽  
Block Polymer ◽  
Rubber Particles

scholarly journals Effect of Stone-Wales Defect on Mechanical Properties of Gr/epoxy Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1116 ◽  
Author(s):  
Maoyuan Li ◽  
Peng Chen ◽  
Bing Zheng ◽  
Tianzhengxiong Deng ◽  
Yun Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Modulus ◽  
High Performance ◽  
Volume Fraction ◽  
Epoxy Nanocomposites ◽  
Dynamic Simulations ◽  
Plane Shear ◽  
High Performance Polymer ◽  
Superior Mechanical Properties ◽  
Perfect Graphene

Due to its superior mechanical properties, graphene (Gr) has the potential to achieve high performance polymer-based nanocomposites. Previous studies have proved that defects in the Gr sheets could greatly reduce the mechanical properties of Gr, while the Stone-Wales (SW) defect was found to enhance the interfacial mechanical strength between Gr and epoxy. However, the combined effects of defects on the overall mechanical properties of Gr/epoxy nanocomposites have not been well understood. In this paper, the effect of the SW defect on the mechanical properties of Gr/epoxy nanocomposites was systematically investigated by using molecular dynamic simulations. The simulation results showed that the SW defect would degrade the mechanical properties of nanocomposites, including the Young’s modulus and in-plane shear modulus. Surprisingly, the transverse shear modulus could be remarkably enhanced with the existence of SW. The reinforcing mechanisms were mainly due to two aspects: (1) the SW defect could increase the surface roughness of the Gr, preventing the slippage between Gr and epoxy during the transverse shea; and (2) the nanocomposite with defective Gr enables a higher interaction energy than that with perfect graphene. Additionally, the effects of temperature, the dispersion and volume fraction of Gr were also investigated.

The curing behaviour and thermo-mechanical properties of core–shell rubber-modified epoxy nanocomposites

2018 ◽  
Vol 27 (3) ◽  
pp. 168-175
Author(s):  
Dong Quan ◽  
Alojz Ivankovic
Keyword(s):  
Mechanical Properties ◽  
Abrupt Onset ◽  
Core Shell ◽  
Curing Process ◽  
Epoxy Nanocomposites ◽  
Scanning Calorimetry ◽  
Diffusion Controlled ◽  
Reactive Groups ◽  
Higher Temperature ◽  
Physical Changes

This work investigates the effects of core–shell rubber (CSR) nanoparticles on the curing behaviour and thermo-mechanical properties of an epoxy using differential scanning calorimetry and dynamic mechanical thermal analysis approaches. Interaction between CSR nanoparticles and epoxy matrix is detected at a temperature of approximately 97°C in the curing process. This results in an increase in the glass transition temperature ( Tg) of the cured nanocomposites. Given the semi-dynamic curing schedule, the curing process of all the epoxy nanocomposites consists of an abrupt onset stage followed by a slow diffusion-controlled stage. Higher temperature is required to initiate the curing for the epoxy nanocomposites with higher loading of CSR nanoparticles. This is attributed to the physical changes caused by the addition of CSR nanoparticles, such as the increase in the viscosity and the reduction in the density of the reactive groups. The storage modulus of the epoxy decreases in the glassy region but remains constant in the rubbery region due to the incorporation of CSR nanoparticles.

Preparation of High Performance SiCf/SiC Composites through PIP Process

2013 ◽  
Vol 544 ◽  
pp. 43-47 ◽  
Author(s):  
Ming Wei Chen ◽  
Hai Peng Qiu ◽  
Jian Jiao ◽  
Xiu Qian Li ◽  
Yu Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Carbon Coating ◽  
Fracture Behavior ◽  
Pyrolytic Carbon ◽  
Sic Fiber ◽  
The Matrix ◽  
Sic Composites ◽  
Polymer Impregnation ◽  
External Loads

SiC fiber reinforced SiC matrix (SiCf-SiC) composites with and without pyrolytic carbon interphase were prepared by polymer impregnation pyrolysis (PIP) progress. The effect of pyrolytic carbon interphase on the fracture behavior and mechanical properties of SiCf/SiC composites was studied. The results show that pyrolytic carbon interphase weakened the bonding between the matrix and the fibers. The mechanical properties of SiCf-SiC composites with carbon coating were improved effectively via fiber debonding and pulling-out from matrix under external loads. The flexural strength and fracture toughness of the above composites reached up to 498.52MPa and 24.09MPa•m1/2, respectively.

Fracture behavior of core-shell rubber-modified clay-epoxy nanocomposites

2003 ◽  
Vol 43 (10) ◽  
pp. 1635-1645 ◽  
Author(s):  
K. T. Gam ◽  
M. Miyamoto ◽  
R. Nishimura ◽  
H. J. Sue
Keyword(s):  
Fracture Behavior ◽  
Core Shell ◽  
Epoxy Nanocomposites ◽  
Modified Clay

Scratch behavior of epoxy nanocomposites containing α-zirconium phosphate and core-shell rubber particles

2009 ◽  
Vol 49 (3) ◽  
pp. 483-490 ◽  
Author(s):  
Ehsan Moghbelli ◽  
Luyi Sun ◽  
Han Jiang ◽  
Woong J. Boo ◽  
Hung-Jue Sue
Keyword(s):  
Zirconium Phosphate ◽  
Core Shell ◽  
Epoxy Nanocomposites ◽  
Rubber Particles ◽  
Scratch Behavior
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