Nanosilica Modification Of Elastomer Modified Vartm Epoxy Resins For Improved Resin And Composite Toughness
DOWNLOAD
Download Nanosilica Modification Of Elastomer Modified Vartm Epoxy Resins For Improved Resin And Composite Toughness PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Nanosilica Modification Of Elastomer Modified Vartm Epoxy Resins For Improved Resin And Composite Toughness book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Nanosilica Modification Of Elastomer Modified Vartm Epoxy Resins For Improved Resin And Composite Toughness
DOWNLOAD
Author : Jason Robinette
language : en
Publisher:
Release Date : 2007
Nanosilica Modification Of Elastomer Modified Vartm Epoxy Resins For Improved Resin And Composite Toughness written by Jason Robinette and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Epoxy resins categories.
Recent publications have reported a synergy between rubber and silica in modified epoxy resins that results in significantly improved fracture toughness without reductions in other material properties. In this work, we seek to achieve the same type of synergy in commercial vacuum-assisted resin transfer molding (VARTM) epoxy resins, SC15 and SC79, produced by Applied Polymeric, Inc. Nanopox F400 (Hanse Chemie) containing 40 weight-percent epoxy-functional silica in a diglycidyl bisphenol-F (DGEBF) epoxy was blended with the VARTM resins to add various silica loadings in the systems. It was found that the presence of DGEBF influenced resin properties more than silica. This monomer impacted crosslink density and other material properties. The crosslink density of SC15 was increased and resulted in reductions in resin fracture toughness, mode II composite fracture toughness, and increased damage area in impact performance. The crosslink density of SC79 was reduced upon the addition of DGEBF contained in the Nanopox. At 10 weight-percent silica, resin fracture toughness, mode II composite toughness, and impact properties were improved due to decreased matrix crosslink density and the presence of silica. Finally, morphological studies showed that silica influences the rubber phase separation in a model epoxy system and VARTM epoxies. Further research will investigate the effects of epoxy-functional silica addition to phase separation mechanisms in rubber-toughened epoxies.
Nanosilica Modification Of Elastomer Modified Vartm Epoxy Resins For Improved Resin And Composite Toughness
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2007
Nanosilica Modification Of Elastomer Modified Vartm Epoxy Resins For Improved Resin And Composite Toughness written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Recent publications have reported a synergy between rubber and silica in modified epoxy resins that results in significantly improved fracture toughness without reductions in other material properties. In this work, we seek to achieve the same type of synergy in commercial vacuum-assisted resin transfer molding (VARTM) epoxy resins, SC15 and SC79, produced by Applied Polymeric, Inc. Nanopox F400 (Hanse Chemie) containing 40 weight-percent epoxy-functional silica in a diglycidyl bisphenol-F (DGEBF) epoxy was blended with the VARTM resins to add various silica loadings in the systems. It was found that the presence of DGEBF influenced resin properties more than silica. This monomer impacted crosslink density and other material properties. The crosslink density of SC15 was increased and resulted in reductions in resin fracture toughness, mode II composite fracture toughness, and increased damage area in impact performance. The crosslink density of SC79 was reduced upon the addition of DGEBF contained in the Nanopox. At 10 weight-percent silica, resin fracture toughness, mode II composite toughness, and impact properties were improved due to decreased matrix crosslink density and the presence of silica. Finally, morphological studies showed that silica influences the rubber phase separation in a model epoxy system and VARTM epoxies. Further research will investigate the effects of epoxy-functional silica addition to phase separation mechanisms in rubber-toughened epoxies.
The Effects Of Silica Nanoparticles In Toughened Epoxy Resins And Fiber Reinforced Composites Print On Demand
DOWNLOAD
Author : Stephan Sprenger
language : en
Publisher:
Release Date : 2015-12-07
The Effects Of Silica Nanoparticles In Toughened Epoxy Resins And Fiber Reinforced Composites Print On Demand written by Stephan Sprenger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-07 with categories.
Effect Of Nanofillers On Thermo Mechanical Properties Of Polymers And Composite Laminates
DOWNLOAD
Author : Aidah Jumahat
language : en
Publisher:
Release Date : 2011
Effect Of Nanofillers On Thermo Mechanical Properties Of Polymers And Composite Laminates written by Aidah Jumahat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Carbon fibre reinforced polymer (CFRP) composites are high performance materials which are widely used in various applications, such as aircraft and aerospace structures, satellites, advanced marine vessels, fuel tanks, sports equipment, high-end automobile structures and many other strength/weight critical applications. It is well known that CFRP composites are stronger in tension (in the fibre direction) than in compression, typically 30-40% higher. This is due to the fact that the compressive strength depends on the properties of the matrix and quality of the laminate, such as alignment of the fibres embedded in the matrix and void content. In theory, stiffer, stronger and tougher matrices provide better support to the carbon fibres (better resistance to fibre instability or microbuckling), hence enhancing the compressive properties of the CFRP composites. The aim of this study is to improve the properties of the CFRP composite by carefully selecting and incorporating nanofillers in the epoxy resin. The nanomodified-epoxy is then combined with continuous carbon fibres, which results in better overall structural response. The thesis is made up of two main parts i.e., examination of the thermal and mechanical properties of nanomodified-epoxies and investigation of mechanical properties of the nanofilled-CFRP composite with an emphasis on compressive behaviour. In the first part, a systematic experimental investigation is conducted in order to identify the optimum content and dispersion of nanofillers in the resin systems to be used in the fabrication of CFRP composite laminates. The effect of silica nanospheres, carbon nanotubes and clay nanoplatelets on the compressive, tensile, flexural and fracture toughness properties of epoxy polymers were studied. Two types of epoxy resin were used: Epikote 828 and Cycom 977-20. In addition, the thermal properties of the nanomodified-epoxies compared to the neat systems were also investigated. The results showed that the addition of nanosilica into the epoxy significantly enhanced the compressive, tensile and flexural moduli. Additionally, strength and fracture toughness properties were also improved without any significant reduction in failure strain and thermal properties of the epoxy. It was found that the mechanical performance of nanosilica-modified Epikote 828 system was comparable to that of the commercial high-performance Cycom 977-20 polymer. The Halpin-Tsai model was modified to include the effect of particle volume fraction on the shape factor ~ that appears in the equation for predicting the Young's modulus of the nanoreinforced-resin. In the second part of the investigation, the effect of nanosilica on the compressive and in-plane shear properties of HTS40/828 CFRP composite was studied. A number of [O]s and [±45b laminates were fabricated using dry filament winding, wet resin impregnation and vacuum bagging techniques. The quality of the laminate such as fibre distribution, fibre misalignment, void content, fibre and nanosilica volume fraction was examined and measured. Static uniaxial compression and tensile tests on [O]s and [±45b laminates were performed. It was found that the compressive and in-plane shear properties of nanomodified CFRP were better than the neat system. For example, the addition of 7 vol% nanosilica improved the unidirectional (UD) compressive modulus and strength of the HTS40/828 composite by 40% and 54%, respectively. The compressive strength was also predicted using several analytical models based on fibre micro buckling and fibre kinking fracture mechanisms. One of the existing fibre microbuckling models was modified in this work to better account for the non-linear resin response. The predicted values showed that the UD nanomodified-FRP laminate exhibited a better compressive strength compared to that of the neat composite system. In addition, the results demonstrated that the performance of the nanosilica-filled HTS40/828 composite was comparable to that of the commercially available HTS40/977-2 system, which is currently used by the aircraft industry.
Processing Of Multifunctional Epoxy Resins Modified With Silicon Based Nanomaterials Preprint
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2006
Processing Of Multifunctional Epoxy Resins Modified With Silicon Based Nanomaterials Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Improvements in thermal and physical properties of epoxy resin systems have been demonstrated in the past through the influence of fillers. However, these improvements often come with a significant cost to processability. This paper examines the influence of nanofillers on a multifunctional epoxy resin system in terms of processability and thermal properties. The nanocomposites explored included nanosilica, linear calcium silicate (wollastonite), and polyhedral oligomeric silsesquioxane (POSS) in CYCOM 977-3 resin. Composites with three to five weight percent of nanofillers were produced using IKA high shear mixers. The thermal and flow properties of the composites were evaluated using Dynamic Mechanical Thermal Analysis (DMTA) and parallel plate rheology. The microstructure of the composite was explored using Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM). Each of the nanofillers used in this study showed a small improvement in Tg over the neat epoxy. However, the addition of nanosilica dramatically increased the viscosity of the neat resin in contrast to the addition of wollastonite or POSS. The wollastonite showed no degradation in clarity and did not significantly increase the viscosity of the resin.
The Toughening Mechanisms In Epoxy Silica Nanocomposites And Hybrid Epoxy Silica Rubber Nanocomposites
DOWNLOAD
Author : Liang Yi-Ling
language : en
Publisher: ProQuest
Release Date : 2008
The Toughening Mechanisms In Epoxy Silica Nanocomposites And Hybrid Epoxy Silica Rubber Nanocomposites written by Liang Yi-Ling and has been published by ProQuest this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Fracture mechanics categories.
In order to improve the crack resistance of epoxy resins, either soft, micron size rubber particles or rigid, micron size spheres are commonly added as toughening agents. The toughening mechanisms induced by soft rubber particles and rigid spheres are different. The fracture behavior of toughened epoxy resins usually show a peak or plateau when the fraction of toughening agent reaches certain level. Therefore, epoxy resins modified by the incorporation of two types of toughening agents can be developed known as the hybrid composites with toughness greater than that when only one type toughening agent is used. Recently, a well dispersed, nanometer size silica spheres produced by sol-gel technology have been added into epoxy resin. The toughening behavior of the epoxy-silica nanocomposite (ESNs) is very interesting since it contradicts many conventional predictions. Moreover, a significant improvement of fracture behavior has been reported in hybrid epoxy-silica-rubber nanocomposite (HESRNs) when a small amount of nanosilica is used. However the toughening mechanisms in ESNs and HESRNs are not clear. The focus of this study is to understand the effect of nanosilica size as well as the nanosilica dispersion on the toughening behavior in ESNs and HESRNs. In addition, a system of hybrid epoxy-rubber?rubber blends (HERRBs) is developed to further elucidate the role of nanosilica in toughening mechanisms of ESNs, HESRNs.
Toughening Mechanism In Elastomer Modified Epoxy Resins
DOWNLOAD
Author : A. F. Yee
language : en
Publisher:
Release Date : 1983
Toughening Mechanism In Elastomer Modified Epoxy Resins written by A. F. Yee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Epoxy resins categories.
Mechanical And Fatigue Characterization Of Carbon Fiber Reinforced Composite Containing Rubber Micro Particles And Silica Nano Particles
DOWNLOAD
Author : Dinesh Kumar Kannabiran Vasudevan
language : en
Publisher:
Release Date : 2016
Mechanical And Fatigue Characterization Of Carbon Fiber Reinforced Composite Containing Rubber Micro Particles And Silica Nano Particles written by Dinesh Kumar Kannabiran Vasudevan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Composite materials categories.
Composite materials play a vital role in a wide range of applications. Their adaptability to different situations and desirable properties attracted many industries. In the automotive industry the demand for lighter weight components is increasing day by day. Carbon-fiber reinforced epoxy composites are making inroads used in the automotive industry because of their superior properties such as high specific strength and stiffness, and chemical resistance. Since epoxy resins are brittle in nature, their toughness can be enhanced by reactive liquid rubbers and inorganic fillers. In this study carbon fiber reinforced composites were manufactured using epoxy resin modified by reactive liquid rubber particles carboxyl terminated butadiene acrylonitrile (CTBN) and nanosilica. Since fatigue failure of composite material is a complex phenomenon; the major aim of this study is to examine the effect of CTBN, nanosilica and hybrid (CTBN and nanosilica) under axial tension- tension fatigue performance. This research was first initiated by performing mechanical characterization (tensile and flexural) on neat, rubber and nanosilica modified resin specimens. Carbon fiber-reinforced nanomodified epoxy composite panels were manufactured by Vacuum Assisted Resin Transfer Molding (VARTM). To obtain a qualitative dispersion of rubber particles and nanoparticles in resin, centrifugal planetary mixer (THINKYTM) was utilized in this research. Two different concentrations of rubber and nanoparticle particles were tested under tensile, flexural, and interlaminar shear loadings. Then the data was compared against a control (0 wt% of rubber particles and nanoparticles) composite. Based on mechanical characterization, one particular loading was selected for fatigue studies. Extensive axial tension-tension fatigue testing was performed on control, rubber modified, nano modified and hybrid composites.
The Effects Of Silica Nanoparticles In Toughened Epoxy Resins And Fiber Reinforced Composites
DOWNLOAD
Author : Stephan Sprenger
language : en
Publisher: Carl Hanser Verlag GmbH Co KG
Release Date : 2015-12-07
The Effects Of Silica Nanoparticles In Toughened Epoxy Resins And Fiber Reinforced Composites written by Stephan Sprenger and has been published by Carl Hanser Verlag GmbH Co KG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-07 with Technology & Engineering categories.
This work shows how the properties of cured epoxy resins are improved significantly by the addition of surface-modified silica nanoparticles. Addition of nanosilica typically linearly increases both the modulus and the fracture toughness, and compressive strength and fatigue performance can be improved significantly as well. Combining this modification with the classic toughening concept using reactive liquid rubbers or core-shell elastomers leads to hybrid systems, which are characterized by high toughness and stiffness, with further-improved fatigue performance. Laminates manufactured by using these modified resins exhibit improved performance as well. For the fatigue performance of laminates made from hybrid resins a tenfold increase in cyclic loadings upon failure can be achieved. This makes them especially suitable for highly stressed composites parts such as in automotive applications, aerospace, or wind energy.
Handbook Of Epoxy Blends
DOWNLOAD
Author : Jyotishkumar Parameswaranpillai
language : en
Publisher: Springer
Release Date : 2017-07-07
Handbook Of Epoxy Blends written by Jyotishkumar Parameswaranpillai and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-07 with Technology & Engineering categories.
This reference work compiles and summarizes the available information on epoxy blends. It covers all essential areas – the synthesis, processing, characterization and applications of epoxy blends – in a comprehensive manner. The handbook is highly application-oriented and thus serves as a valuable, authoritative reference guide for researchers, engineers, and technologists working on epoxy blends, but also for graduate and postgraduate students, polymer chemists, and faculties at universities and colleges.The handbook is divided into three parts and organized by the types of blends and components: Part I covers epoxy rubber blends, Part II focuses on epoxy thermoplastic blends, and Part III examines epoxy block-copolymer blends. Each part starts with an introduction, and the individual chapters provide readers with comprehensive information on the synthesis and processing, analysis and characterization, properties and applications of the different epoxy blends. All parts conclude with a critical evaluation of the applications, weighing their advantages and drawbacks. Leading international experts from corporate and academic research institutions and universities discuss the correlations of different epoxy blend properties with their macro-, micro- and nanostructures. This handbook thus offers a rich resource for newcomers to the field, and a major reference work for experienced researchers, the first of its kind available on the market. As epoxies find extremely broad applications, e.g. in oil & gas, in the chemical industry, building and construction industry, automotive, aviation and aerospace, boat building and marine applications, in adhesives and coatings, and many more, this handbook addresses researchers and practitioners from all these fields.