Thermosetting Resin—Properties

Varma, I. K.; Gupta, V. B.

doi:10.1016/b0-08-042993-9/00177-7

Cited by 40 publications

(43 citation statements)

References 321 publications

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“…It can be crystallized in three distinct structures, which are known as rutile, anatase and brookite. Epoxy resins are considered as a common and successful polymer matrix for the fabrication of composite materials due to their good adhesion with reinforcing elements, enhanced thermal stability, resistance to chemical attack and resistance to degradation under the influence of corrosive environment [7][8][9][10][11]. In the present study, the dielectric properties of composite systems consisting of an epoxy resin and ceramic titanium dioxide particles are investigated by means of Broadband Dielectric Spectroscopy (BDS) in a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

Electrical relaxation dynamics in TiO2 – polymer matrix composites

Kontos¹,

Soulintzis²,

Karahaliou³

et al. 2007

Express Polym. Lett.

145

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Abstract. Polymer matrix-TiO2 composites were prepared in three different filler concentrations. The electrical relaxation dynamics as well as the electrical conductivity of all samples were examined by means of Broadband Dielectric Spectroscopy (BDS) over a wide frequency and temperature range. The recorded relaxation response includes contributions from both the polymer matrix and the reinforcing phase. Two relaxation modes (β and γ) are observed in the low temperature region, which are attributed to the re-orientation of polar side groups of the matrix and rearrangement of small parts of the polymeric chain respectively. The α-relaxation and the Maxwell-Wagner-Sillars effect (MWS), attributed to the glassrubber transition of the polymeric matrix and to interfacial polarization phenomena respectively, are observed in the high temperature region. These two mechanisms are superimposed, thus a computer simulation procedure was followed in order to distinguish them. MWS effect becomes more pronounced with increasing concentration of the filler following an Arrhenius behaviour. The relaxation frequencies corresponding to α-mode follow the Vogel-Tamann-Fulcher (VTF) equation. An additional relaxation mode is recorded at relatively high temperatures and high frequencies. Its occurrence and dynamics are related to the presence and the concentration of the filler. Finally, the Direct Current (DC) conductivity follows the VTF equation.

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Section: Introductionmentioning

confidence: 99%

Electrical relaxation dynamics in TiO2 – polymer matrix composites

Kontos¹,

Soulintzis²,

Karahaliou³

et al. 2007

Express Polym. Lett.

145

View full text Add to dashboard Cite

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“…Addition of flow media greatly increased infusion rates and created successful part using epoxy resin [13][14][15]. When working with molds of large size and complex shape, dry reinforcement may not readily sit flat.…”

Section: Selection and Placing Reinforcement And Flow Mediamentioning

confidence: 99%

Cost‐effective manufacturing process for the development of automotive from energy efficient composite materials and sandwich structures

Khan¹,

Mahmood

Hassan

et al. 2013

Polymer Composites

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The advanced composite materials are increasingly being used in the automotives for their ultralight physical properties and super strong mechanical properties. This research examines the cost‐effective single‐step liquid resin infusion manufacturing process for developing all composite car body as the generally used sheet molding compound manufacturing process is highly capital intensive. Three different scaled down models of the Eco car were developed focusing on minimal weight and air drag coupled with aesthetics. Structural design and analysis was carried out using the Pro/E and Ansys tools. The Pro‐E model was scaled up to generate computer‐aided drafting drawings for tool development. Different stations were marked on the model and sliced virtually for development of pattern. Moreover, the mold was manufactured from carbon and glass/polyester composites for prototype manufacturing of the car body. This involved manual placement of desired number of carbon layers as preform on female side of the mold. The vacuum sucked the resin through a number of carefully selected entry ports which ensured effective resin distribution and impregnation. Polycarbonate wind shield was thermoformed in the convection oven according to streamlined geometry of car body and hinged. The car body was integrated with the compatible floor panels and accessories. The crumble zone shock absorber in the bumper was manufactured using successive layers of nomax honeycomb and polyvinyl chloride rigid foam to dampen the accidental shock. The car performed remarkably well in the Eco marathon race held at Malaysia, 35:97–104, 2014. POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers

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“…Epoxy resins are widely used in industrial applications, such as matrices in composite materials, and for aerospace applications, adhesives, coating, electronic circuit board-laminates, and so forth due to their excellent mechanical and thermal properties, low cost, ease of processing, fine adhesion to many substrates, good chemical resistance, good weathering resistance, low specific weight, and long pot life period [1]. The major problems with epoxy are low stiffness and low strength compared to metals and also cured epoxy resins are highly brittle, which greatly limits their application in some areas [2].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cure Reaction, Rheology, Volume Shrinkage and Thermomechanical Properties of Nano-TiO₂ Filled Epoxy/DDS Composites

Parameswaranpillai

George

Pionteck

et al. 2013

Journal of Polymers

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The cure reaction, rheology, volume shrinkage, and thermomechanical behavior of epoxy-TiO 2 nanocomposites based on diglycidyl ether of bisphenol A cured with 4,4 -diaminodiphenylsulfone have been investigated. The FTIR results show that, at the initial curing stage, TiO 2 acts as a catalyst and facilitates the curing. The catalytic effect of TiO 2 was further confirmed by the decrease in maximum exothermal peak temperature (DSC results); however, it was also found that the addition of TiO 2 decreases the overall degree of cure, as evidenced by lower total heat of reaction of the cured composites compared to neat epoxy. The importance of cure rheology in the microstructure formation during curing was explored by using rheometry. From the PVT studies, it was found that TiO 2 decreases the volume shrinkage behavior of the epoxy matrix. The mechanical properties of the cured epoxy composites, such as tensile strength, tensile modulus, flexural strength, flexural modulus, impact strength, and fracture toughness of the polymer composites, were examined. The nanocomposites exhibited good improvement in dimensional, thermal, and mechanical properties with respect to neat cross-linked epoxy system. FESEM micrographs of fractured surfaces were examined to understand the toughening mechanism.

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Thermosetting Resin—Properties

Cited by 40 publications

References 321 publications

Electrical relaxation dynamics in TiO2 – polymer matrix composites

Electrical relaxation dynamics in TiO2 – polymer matrix composites

Cost‐effective manufacturing process for the development of automotive from energy efficient composite materials and sandwich structures

Investigation of Cure Reaction, Rheology, Volume Shrinkage and Thermomechanical Properties of Nano-TiO₂ Filled Epoxy/DDS Composites

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Thermosetting Resin—Properties

Cited by 40 publications

References 321 publications

Electrical relaxation dynamics in TiO2 – polymer matrix composites

Electrical relaxation dynamics in TiO2 – polymer matrix composites

Cost‐effective manufacturing process for the development of automotive from energy efficient composite materials and sandwich structures

Investigation of Cure Reaction, Rheology, Volume Shrinkage and Thermomechanical Properties of Nano-TiO2 Filled Epoxy/DDS Composites

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Product

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Investigation of Cure Reaction, Rheology, Volume Shrinkage and Thermomechanical Properties of Nano-TiO₂ Filled Epoxy/DDS Composites