Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India

India

Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India

India

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Paluvai N.R.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India | Mohanty S.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India | Nayak S.K.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India
Polymers for Advanced Technologies | Year: 2015

The present study highlights the structure and property relationships of epoxidized castor oil (ECO) toughened Diglycidyl Ether of Bisphenol A (DGEBA) epoxy nanocomposites. Toughened epoxy systems have been prepared by an addition of 10-40wt% ECO to the DGEBA epoxy resin. Nanocomposites were prepared by mixing small amounts of Cloisite 30B (C30B) clay and 3-aminopropyltriethoxysilane to the DGEBA/ECO blends. The chemical structure of toughened systems was confirmed using proton nuclear magnetic resonance and fourier transform infrared spectroscopy. The triethylenetetraamine-cured DGEBA/ECO/C30B (8:2:0.1) nanocomposites exhibited tensile strength (50MPa), tensile modulus (1.7GPa), flexural strength (120MPa), flexural modulus (3.02GPa), and elongation (19%). The fracture toughness (critical intensity factor, KIC) and fracture energy (critical energy release rate, GIC) of DGEBA/ECO/C30B (8:2:0.1) system found to be higher than the other systems (2.5MPa.m1/2 and 1.8kJ/m2 for KIC and GIC, respectively). The thermal stability and heat of reaction of DGEBA/ECO blends increase with the addition of C30B clays that were analyzed using thermogravimetric analysis and differential scanning calorimetry. Rheological characterizations of uncured samples revealed a pronounced effect of the C30B clay on the DGEBA/ECO blend systems that exhibited a shear-thickening behavior. On the other hand, the dynamic mechanical properties also revealed that the addition of C30B clays to the DGEBA/ECO blend a significant enhancements in viscoelastic and cross linking density behavior. Scanning electron microscope analysis was used to study the fractured morphology of DGEBA, DGEBA/ECO, and its nanocomposite systems. © 2015 John Wiley & Sons, Ltd.


Reddy Paluvai N.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India | Mohanty S.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India | Nayak S.K.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India
Polymer Composites | Year: 2015

This study examined the dynamic mechanical properties of sisal fiber reinforced unsaturated polyester (UP) toughened epoxy nanocomposites. The chemical structures changes in Epoxy, UP and UP toughened epoxy (Epoxy/UP) systems were characterized by Proton Nuclear magnetic resonance (1HNMR) spectroscopy. The morphological alterations of the nanocomposites were analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The untreated, chemically treated fibers, nanoclays, and the fiber reinforced Epoxy/UP nanocomposites were confirmed by FTIR spectrometer. The obtained mechanical results showed that alkali-silane treated fibers improve the tensile strength (96%) and flexural strength (60%) of the Epoxy/UP nanocomposite than that of Epoxy/UP blend due to the strong interfacial bonding between the sisal fiber and matrix. The fracture toughness (KIC) and fracture energy (GIC) of treated sisal fiber reinforced DGEBA/UP/C30B nanocomposites found to be higher than that of untreated sisal fiber nanocomposites. The dynamic mechanical analysis (DMA) reveals that the fiber reinforced Epoxy/UP nanocomposites contains 30 wt% treated fiber and 1 wt% nanoclays, exhibits the highest storage modulus and better glass transition temperature (Tg) among the other kind of systems. The surface morphology of the fibers, fractured surface of the resins and composites were confirmed by scanning electron microscope (SEM). © 2015 Society of Plastics Engineers.


Paluvai N.R.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India | Mohanty S.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India | Nayak S.,Advanced Research School for Technology and Product Simulation ARSTPS Central Institute of Plastics Engineering and Technology CIPET Chennai India
Journal of Vinyl and Additive Technology | Year: 2015

In the present study, the mechanical and thermal properties of sisal fiber-reinforced unsaturated polyester (UP)-toughened epoxy composites were investigated. The sisal fibers were chemically treated with alkali (NaOH) and silane solutions in order to improve the interfacial interaction between fibers and matrix. The chemical composition of resins and fibers was identified by using Fourier-transform infrared spectroscopy. The UP-toughened epoxy blends were obtained by mixing UP (5, 10, and 15 wt%) into the epoxy resin. The fiber-reinforced composites were prepared by incorporating sisal fibers (10, 20, and 30 wt%) within the optimized UP-toughened epoxy blend. Scanning electron microscopy was used to analyze the morphological changes of the fibers and the adhesion between the fibers and the UP-toughened epoxy system. The results showed that the tensile and flexural strength of (alkali-silane)-treated fiber (30 wt%) -reinforced composites increased by 83% and 55%, respectively, as compared with that of UP-toughened epoxy blend. Moreover, thermogravimetric analysis revealed that the (alkali-silane)-treated fiber and its composite exhibited higher thermal stability than the untreated and alkali-treated fiber systems. An increase in storage modulus and glass transition temperature was observed for the UP-toughened epoxy matrix on reinforcement with treated fibers. The water uptake behavior of both alkali and alkali-silane-treated fiber-reinforced composites is found to be less as compared with the untreated fiber-reinforced composite. © 2015 Society of Plastics Engineers.

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