Miscibility, morphology, mechanical, and thermodynamic properties of epoxy resins toughened with functionalized core-shell nanoparticles containing epoxy groups on the surface

2013 ◽  
Vol 43 (1) ◽  
pp. 8-18 ◽  
Author(s):  
Xugang Zhang ◽  
Bin Zhang ◽  
Mingming Sun ◽  
Jianhui Li ◽  
Lei Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Thermodynamic Properties ◽  
Thermal Resistance ◽  
Epoxy Resins ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Content Type ◽  
Core Shell Nanoparticles ◽  
Epoxy Groups

Purpose – In order to obtain functionalized core-shell nanoparticles (CSNPs) as excellent toughening agents for epoxy resins. The paper aims to discuss these issues. Design/methodology/approach – Functionalized CSNPs containing epoxy groups on the surface were synthesized by emulsion polymerization with butyl acrylate as the core and methyl methacrylate copolymerizing with glycidyl methacrylate (GMA) as the shell. CSNPs were used as toughening agents for epoxy resins and their chemical structure was characterized by FT-IR. The morphology of modified epoxy networks (MEPN) was analyzed by SEM and TEM. Both the mechanical properties and thermodynamic properties were studied. Findings – The results show that nearly spherical CSNPs with the particle size of 50-100 nm are obtained. A certain amount of CSNPs are uniformly dispersed in epoxy resins by the grinding method and the MEPN shows the ductile fracture feature. The miscibility between CSNPs and epoxy matrix increases with the increase of GMA concentration which makes more bonds form between them. Epoxy resins toughened with 10 wt% CSNPs containing 10 wt% GMA show the best mechanical properties and the increase in tensile strength and impact strength of the MEPN is 13.5 and 59.7 percent, respectively, over the unmodified epoxy networks. And the improvement in impact strength is not accompanied with loss of thermal resistance. Practical implications – The MEPN can be used as high-performance materials such as adhesives, sealants and matrixes of composites. Originality/value – The functionalized CSNPs are novel and it can greatly increase the toughness of epoxy resins without loss of thermal resistance.

Tuning the mechanical properties of nanostructured ionomer films by controlling the extents of covalent crosslinking in core-shell nanoparticles

2012 ◽  
Vol 22 (12) ◽  
pp. 5840 ◽  
Author(s):  
Somjit Tungchaiwattana ◽  
Robert Groves ◽  
Peter A. Lovell ◽  
Orawan Pinprayoon ◽  
Brian R. Saunders
Keyword(s):  
Mechanical Properties ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Covalent Crosslinking ◽  
Core Shell Nanoparticles

Toughened Epoxy Adhesive Modified with Core-Shell Nanoparticles Containing Epoxy Groups on the Surface

2012 ◽  
Vol 184-185 ◽  
pp. 1375-1379
Author(s):  
Xu Gang Zhang ◽  
Bin Zhang ◽  
Ming Ming Sun ◽  
Jian Hui Li ◽  
Lei Wang ◽  
...  
Keyword(s):  
Epoxy Resins ◽  
Small Scale ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Adhesion Properties ◽  
Epoxy Networks ◽  
Grinding Method ◽  
Toughened Epoxy ◽  
Core Shell Nanoparticles ◽  
Modified Epoxy

The epoxy resins were toughened with reactive core-shell nanoparticles(CSNPs) with butyl acrylate (BA) as the core and methyl methacrylate (MMA) copolymerizing with glycidyl methacrylate (GMA) as the shell. The chemical structure of the CSNPs was characterized by FT-IR. The morphology of toughened epoxy networks were analyzed by SEM and TEM, and their adhesion properties were also detected. The results show that mixing methods and CSNP concentration have great influence on the morphology and adhesion properties of the toughened epoxy networks. CSNPs are uniformly dispersed in the epoxy resins by the grinding method. The modified epoxy networks obtained from the modified epoxy networks prepared by the grinding method(MEPN2) with 10 wt% CSNPs show the best adhesion properties, and the increase in maximum peel strength, 25°C sheer strength and 150°C sheer strength of the modified epoxy networks is 401.3% , 46.9% and 27.6% respectively over the unmodified epoxy networks due to the small-scale coagulations of CSNPs.

Preparation of TiO2-g-Polystyrene Nanosphere and its Application in Toughening PS Matrix

2010 ◽  
Vol 97-101 ◽  
pp. 1677-1680 ◽  
Author(s):  
Xiao Ming Sang ◽  
Peng Wu ◽  
Gui Xiang Hou ◽  
Shou Wu Yu
Keyword(s):  
Impact Strength ◽  
Core Shell ◽  
Gravimetric Analysis ◽  
Nano Tio2 ◽  
Shell Nanoparticles ◽  
Maximum Value ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Core Shell Nanoparticles ◽  
The Impact

TiO2-g-Polystyrene(PS) nano-microspheres were prepared by grafted styrene monomer on the surface of nano-TiO2 particles via emulsion polymerization, and its surface and morphology were studied by Transmission electron microscopes(TEM), Fourier transform infrared spectroscopy(FTIR) and thermal gravimetric analysis(TGA). The results showed that the TiO2-g-PS nano-microsphere had a structure of sphericity composed of TiO2 and PS as core and shell respectively. The core-shell nanoparticles were subsequently used as filler in a PS matrix, and the impact strength of the TiO2-g-PS/PS composites were studied. The results showed that the impact strength of the composite material could be improved obviously, the maximum value of impacted strength of the TiO2-g-PS/PS was 1.75kJ/m2, which was 180% higher than that of pure PS. Drawing from the results, it could be confirmed that these core-shell TiO2-g-PS nanosphere fillers could toughen the PS matrix.

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