Effect of nanosilica on the properties of PEI/silicone rubber blend based nanocomposites

The aim of the present study is to prepare nanocomposites based on binary blends of poly ether imide (PEI)/silicone rubber reinforced with varied loadings of modified nanosilica particles. Nanocomposites have been prepared by melt blending process using twin screw extruder. Thermal behaviour of the developed nanocomposites has been studied with the help of TGA and DMA. Morphological properties have been visualized by SEM. Mechanical properties of the nanocomposites have been determined by universal testing machine. It has been observed that almost all the properties have been found to increase upto 25% with the incorporation of modified nanosilica particles in polymer matrices. Enhancement in various properties may be attributed to better interfacial adhesion and fairly good polymer filler interactions

Composite materials based on high-performance polymer for high-tech applications

<p><span>Composite materials have been used since ancient civilizations when chopped straw was added to brick to form building materials. In the present era, the development of polymer composites has attracted a lot of attention from researchers because of their significantly improved properties as compared to intrinsic polymers or conventional composites. A polymer composite is a lightweight multiphase material developed by combining two or more dissimilar materials. They are combined in such a way that the resulting composite material possesses excellent superior properties (thermal, mechanical, and morphological) which are not achieved with a single constituent’s materials. These composite materials are supposed to replace metals like iron, steel, copper, etc from various areas of society. Composite materials can be broadly classified into two categories natural and synthetic composite materials. Various advanced analytical techniques, including UTM, TGA, DSC, DMA, SEM, FTIR, and others, will be used to characterize the developed composites for their mechanical, thermal, structural, and morphological properties. Compared to pure PEI, a significant enhancement was obtained at 2 wt% loading of HNTs in the PEI matrix, with about 8% enhancement in tensile stress, 4% modulus, 40% impact energy, and 43% izod impact strength. Thermo-gravimetric analysis (TGA) results of created composites demonstrate a 20°C increase in thermal stability with the addition of 2 wt% HNTs in the PEI matrix. </span></p&gt

Effect of nanosilica on the properties of PEI/silicone rubber blend based nanocomposites

846-850The aim of the present study is to prepare nanocomposites based on binary blends of poly ether imide (PEI)/silicone rubber reinforced with varied loadings of modified nanosilica particles. Nanocomposites have been prepared by melt blending process using twin screw extruder. Thermal behaviour of the developed nanocomposites has been studied with the help of TGA and DMA. Morphological properties have been visualized by SEM. Mechanical properties of the nanocomposites have been determined by universal testing machine. It has been observed that almost all the properties have been found to increase upto 25% with the incorporation of modified nanosilica particles in polymer matrices. Enhancement in various properties may be attributed to better interfacial adhesion and fairly good polymer filler interactions

Electrical Transport, Structural, Optical and Thermal Properties of [(1−x)Succinonitrile: xPEO]-LiTFSI-Co(bpy)3(TFSI)2-Co(bpy)3(TFSI)3 Solid Redox Mediators

The solar cell has been considered one of the safest modes for electricity generation. In a dye-sensitized solar cell, a commonly used iodide/triiodide redox mediator inhibits back-electron transfer reactions, regenerates dyes, and reduces triiodide into iodide. The use of iodide/triiodide redox, however, imposes several problems and hence needs to be replaced by alternative redox. This paper reports the first Co2+/Co3+ solid redox mediators, prepared using [(1−x)succinonitrile: xPEO] as a matrix and LiTFSI, Co(bpy)3(TFSI)2, and Co(bpy)3(TFSI)3 as sources of ions. The electrolytes are referred to as SN_E (x = 0), Blend 1_E (x = 0.5 with the ethereal oxygen of the PEO-to-lithium ion molar ratio (EO/Li+) of 113), Blend 2_E (x = 0.5; EO/Li+ = 226), and PEO_E (x = 1; EO/Li+ = 226), which achieved electrical conductivity of 2.1 × 10−3, 4.3 × 10−4, 7.2 × 10−4, and 9.7 × 10−7 S cm−1, respectively at 25 °C. Only the blend-based polymer electrolytes exhibited the Vogel-Tamman-Fulcher-type behavior (vitreous nature) with a required low pseudo-activation energy (0.05 eV), thermal stability up to 125 °C, and transparency in UV-A, visible, and near-infrared regions. FT-IR spectroscopy demonstrated the interaction between salt and matrix in the following order: SN_E < Blend 2_E < Blend 1_E << PEO_E. The results were compared with those of acetonitrile-based liquid electrolyte, ACN_E