scholarly journals Enhancing Thermo-Mechanical Properties of Epoxy Composites Using Fumed Silica with Different Surface Treatment

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2691
Author(s):  
Kyung-Min Kim ◽  
Hoon Kim ◽  
Hyun-Joong Kim
Keyword(s):  
Mechanical Properties ◽  
Fumed Silica ◽  
Epoxy Matrix ◽  
Polymer Nanocomposite ◽  
Crosslinking Density ◽  
Silica Content ◽  
Strong Interactions ◽  
Epoxy Nanocomposite ◽  
Very High ◽  
Thermal Stability Of

The objectives of this study are to improve the thermal and mechanical properties of epoxy/fumed silica composite with different surface treatments of fumed silica. The addition of silica nanoparticles improved the thermal stability of the composite and slowed down the pyrolysis process. The crosslinking density and Tg of the epoxy/fumed silica composites increased because of the interfacial interaction between the PDMS-treated fumed silica particles and the epoxy matrix. The flexural strength of the epoxy nanocomposite was very high even at a low silica content because of the strong interactions between the PDMS-treated fillers and the epoxy matrix. These strong interfacial interactions originate from the attractive forces between the polymer and the filler. Therefore, the polymer nanocomposite containing the PDMS-treated fumed silica is shown to be sufficiently commercially promising.

scholarly journals Super-Toughened Fumed-Silica-Reinforced Thiol-Epoxy Composites Containing Epoxide-Terminated Polydimethylsiloxanes

2021 ◽  
Vol 22 (15) ◽  
pp. 8097
Author(s):  
Goseong Bok ◽  
Gayoung Lim ◽  
Mingi Kwak ◽  
Youngmin Kim
Keyword(s):  
Mechanical Properties ◽  
Fumed Silica ◽  
High Performance ◽  
Crosslinking Density ◽  
Silica Content ◽  
Epoxy Composites ◽  
Composite Component ◽  
Thiol Compounds ◽  
Filler Dispersion ◽  
Curing Agents

In response to the demand for high-performance materials, epoxy thermosetting and its composites are widely used in various industries. However, their poor toughness, resulting from the high crosslinking density of the epoxy network, must be improved to expand their application to the manufacturing of flexible products. In this study, ductile epoxy thermosetting was produced using thiol compounds with functionalities of 2 and 3 as curing agents. The mechanical properties of the epoxy were further enhanced by incorporating fumed silica into it. To increase the filler dispersion, epoxide-terminated polydimethylsiloxane was synthesized and used as a composite component. Thanks to the polysiloxane–silica interaction, the nanosilica was uniformly dispersed in the epoxy composites, and their mechanical properties improved with increasing fumed silica content up to 5 phr (parts per hundred parts of epoxy resin). The toughness and impact strength of the composite containing 5 phr nanosilica were 517 (±13) MJ/m3 and 69.8 (±1.3) KJ/m2, respectively.

Effect of silica content on thermal stability of fumed silica/epoxy composites

2008 ◽  
Vol 93 (12) ◽  
pp. 2133-2137 ◽  
Author(s):  
J. Tarrío-Saavedra ◽  
J. López-Beceiro ◽  
S. Naya ◽  
R. Artiaga
Keyword(s):  
Thermal Stability ◽  
Fumed Silica ◽  
Silica Content ◽  
Epoxy Composites ◽  
Thermal Stability Of

Polymer Nanocomposite Development for Electronic Industry Needs

2009 ◽  
Vol 151 ◽  
pp. 3-9 ◽  
Author(s):  
Jari Koskinen ◽  
Mikko Karttunen ◽  
Mika Paajanen ◽  
Juha Sarlin
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polymeric Materials ◽  
Polymer Nanocomposite ◽  
Polymer Materials ◽  
Research Centre ◽  
Electronic Industry ◽  
Application Potential ◽  
Industry Needs ◽  
Thermal Stability Of

The properties of polymeric materials have been enhanced by developing nanocomposites in several projects at the Technical Research Centre of Finland VTT. The improvement of conductivity, dielectric, mechanical properties and the thermal stability of polymer materials opens new application potential in electronic industry. In this paper the results of several projects are presented. By applying nano-POSS particles in polypropylene and epoxy the break down voltage was increased by 10 - 20%. The use of carbon nanotubes in polyaniline enhanced the conductivity by two decades compared to the commercially available polymers.

Utilizing Pyrolytic Biomass Products for Rubber Reinforcement: Effect of the Silica Content in Biomass Feed Stocks

2021 ◽  
Vol 36 (5) ◽  
pp. 620-629
Author(s):  
L.-Y. Yu ◽  
B.-C. Xue ◽  
M.-M. Qian ◽  
Y.-X. Li ◽  
Z.-X. Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silica Content ◽  
Milling Process ◽  
Particle Sizes ◽  
Rice Husks ◽  
Reinforcement Effect ◽  
Elongation At Break ◽  
Rubber Industry ◽  
Modification Process ◽  
Thermal Stability Of

Abstract Biochar has been exploited as a substitution of carbon black in the rubber industry and various biochars exhibit diverse reinforcing abilities due to the different compositions. This work aims at studying the effect of silica on the modification process and reinforcing performance through the comparison of three biochars with different contents of silica, pyrolytic rice husks (PRH, 34 wt%), pyrolytic bamboos (PB, 7 wt%) and pyrolytic corn cobs (PC, 0.4 wt%). The results reveal that PRH requires higher rotational speed (300 min–1) than PB (200 min–1) and PC (200 min–1) to achieve similar particle sizes during the ball milling process because of the aggregations of higher silica content. Meanwhile, silica-rich pyrolytic biomass exhibits enhanced reinforcement on mechanical properties and thermal stability of rubber, and the elongation at break of vulcanizates continues to improve with increasing silica contents. Combined with the energy consumption and reinforcement, biochar containing a little amount of silica is more suitable to be widely used as bio-filler in rubber industry. This work should serve as a valuable reference to select appropriate biochar for the production of bio-fillers with high reinforcement.

Mechanical Properties of Fumed Silica/PP Composites

2014 ◽  
Vol 665 ◽  
pp. 319-322
Author(s):  
Hai Qing Ma ◽  
Zheng Jin ◽  
Wen Long Li ◽  
Di Wu ◽  
Jing Zhao
Keyword(s):  
Mechanical Properties ◽  
Fumed Silica ◽  
Polarized Light ◽  
Silica Content ◽  
Mixing Process ◽  
Melt Mixing ◽  
Dispersion Degree ◽  
Twin Screw ◽  
Pp Composites ◽  
Properties Of Composites

Polypropylene/fumed silica composites were prepared via melt mixing using a twin-screw co-rotating extruder. To improve the dispersion degree of the fumed silica, γ-aminopropyl triethoxy silane (KH-550) was used as silane coupling agent. The PP composites which obtained different fumed silica content were prepared by melt-mixing process. Then composites mechanical properties were measured by the crystal polarized light microscopy (PLM), hardness, tensile testing and so on. The results indicate that fumed silica could toughen PP resin and mechanical properties of composites were optimum when fumed silica content was 1.5 wt%.

Preparation and Characterization of TPU Toughened PLA Elastic Fibers

2014 ◽  
Vol 789 ◽  
pp. 117-121 ◽  
Author(s):  
Shi Chao Wang ◽  
Heng Xue Xiang ◽  
Xiao Shuang Wen ◽  
Zhe Zhou ◽  
Mei Fang Zhu
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Melt Spinning ◽  
Thermoplastic Polyurethane ◽  
Strong Interactions ◽  
Poly Lactic Acid ◽  
Elastic Fibers ◽  
Elongation At Break ◽  
Thermal Stability Of

Poly (lactic acid) (PLA) elastic fibers were prepared by melt spinning using Thermoplastic polyurethane (TPU) as a toughing agent and PLA-g-MA(Maleic anhydride) as a compatibilizer. Thermal properties and thermal stability of PLA/TPU composites, as well as the cross section morphology and mechanical properties of fibers were studied in the present investigation. DSC results showed that PLA was immiscible with TPU. In addition, the incorporation of TPU decreased the melting enthalpy of PLA/TPU composites. TG results indicated that the initial degradation temperatures of composites were also decreased by the appearance of TPU, and it decreased by 9°Cwhen TPU content was up to 20wt%. FESEM results confirmed that strong interactions were existed between PLA and TPU phases, which were benefit for the improvement of PLA/TPU fibers’ mechanical properties. Results of tensile testing demonstrated that TPU could improve the toughness of fibers effectively and the elongation-at-break of fibers increased from 2.2% of PLA to 203.9% of PLA/TPU.

scholarly journals An Investigation of Abrasion Resistance Property of Clay- Epoxy Nanocomposite Coating

2018 ◽  
Vol 15 (2) ◽  
pp. 165-178 ◽  
Author(s):  
Mukesh K. Madhup ◽  
Nisha K. Shah ◽  
Neha R. Parekh
Keyword(s):  
Abrasion Resistance ◽  
Epoxy Matrix ◽  
Composite Coatings ◽  
Microscopic Analysis ◽  
Bentonite Clay ◽  
Polymer Nanocomposite ◽  
Diglycidyl Ether ◽  
Electron Microscopic ◽  
Epoxy Nanocomposite ◽  
Uniform Dispersion

Diglycidyl ether of bisphenol A based epoxy resin was loaded with alkyl quaternary ammonium modified bentonite clay nanoparticles (b-CNPs) in various concentrations. The abrasion resistance (Taber) property of the composite coatings cured with amine were investigated after 7 days and with 60 days curing at two different cycle viz. 500 and 1000. The mass losses of the materials revealed the fact that abrasion resistance increases with increase in CNPs concentration inside epoxy matrix with ageing. Thermal (DSC), spectroscopic (FTIR) and morphological (SEM) studies were performed to characterize the developed epoxy nanocomposite (ENC) coating. A gradual decrease in glass transition temperature (Tg) was observed with increase in the b-CNPs concentration. The modified b-CNPs found interacting with epoxy matrix and the intensity found increasing with increase in b-CNPs concentration during spectroscopic study. Smooth film morphology was revealed by scanning electron microscopic analysis confirming the uniform dispersion of b-CNPs inside polymer nanocomposite matrix.

Mechanical Properties of Fumed Silica / HDPE Composites

2014 ◽  
Vol 633-634 ◽  
pp. 427-430 ◽  
Author(s):  
Jing Zhao ◽  
Di Wu ◽  
Jin Yu Han ◽  
Zheng Jin
Keyword(s):  
Mechanical Properties ◽  
Fumed Silica ◽  
Polarized Light ◽  
Silica Content ◽  
Mixing Process ◽  
Shore Hardness ◽  
Melt Mixing ◽  
Dispersion Degree ◽  
Silane Coupling ◽  
Properties Of Composites

Fumed silica /High density Polyethylene (HDPE) composites were prepared via melt mixing using a two –screw co-rotating extruder. To improve the dispersion degree of the fumed silica, the γ-aminopropyl triethoxy silane (KH-550) was used as silane coupling agent. The composites which obstained different fumed silica content were prepared by melt-mixing process. Next composites mechanical properties were measured by the crystal polarized light microscopy (PLM), Shore hardness, the tensile testing. The results indicate that fumed silica can enhance HDPE resin and the mechanical properties of composites are optimum when fumed silica content is 3.0 wt%.

Structure and Mechanical Properties of Submicrocrystalline Copper Produced by ECAP to Very High Strains

2006 ◽  
Vol 503-504 ◽  
pp. 971-976 ◽  
Author(s):  
Alexei Vinogradov ◽  
T. Suzuki ◽  
Satoshi Hashimoto ◽  
Kazuo Kitagawa ◽  
A.A. Kuznetsov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Strain Path ◽  
Tensile Ductility ◽  
Tensile Behavior ◽  
Number Of Passes ◽  
Very High ◽  
Thermal Stability Of

The present work is aimed at linking the microstuctutral features obtained after severe plastic deformation via ECAP to the tensile behavior and thermal stability of pure (99.98%) copper processed by routes A and Bc to different number of passes. The main conclusion one can draw unambiguously from the currently available results is that the strain path exerts relatively little effect on the resultant tensile properties when the number of pressing is sufficiently large, although there have been some marked differences in crystallographic textures and distribution of grain-boundaries. The effect of the number of pressings on the tensile ductility is considerable.

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