This article examines the effect of the addition of hexagonal boron nitride (h-BN) nanopowder on the polymer chain confinement, thermal, morphological and mechanical properties of the epoxy system.
Recently, boron nitride (BN) based materials have received significant attention in both academic and industrial sectors due to its interesting properties like large energy band gap, good resistance to oxidation, excellent thermal conductivity, thermal stability, chemical inertness, significant mechanical property and widespread applications. This review article deals with the preparation and properties of boron nitride and its nanocomposites with various polymers. Diverse polymers have been explored for the preparation of boron nitride filled polymer nanocomposites by adopting different mixing methods. Properties of the resulting polymer nanocomposites mainly depend up on filler size and dispersion, mixing conditions and type of interaction between polymer matrix and the filler. Herein, the structure, preparation and properties of various boron nitride based polymer nanocomposites are reviewed in detail along with a brief overview of different classes of BN nanomaterials.
Polymer composite materials fabricated from acrylonitrile-derived polymers (such as polyacrylonitrile, nitrile butadiene rubber, styrene-acrylonitrile, acrylonitrile butadiene styrene) with suitable fillers have found tremendous applications due to their highly desirable properties. Graphene, a versatile 2D carbon nanomaterial, with extraordinary properties has been adopted as an effective filler component of a wide range of acrylonitrile-based polymer composites. The modified and functionalized graphene-based nanomaterials were incorporated into the acrylonitrile-based polymer matrix to enhance their various properties. In contrast to conventional 1D carbon nanoparticles, the incorporation of this graphene into the polymer matrix resulted excellent improvement in mechanical, electrical, rheological, and thermal, as well as frictional properties. This has offered advances in diverse applications such as sensors, flexible electronics, Li-S battery, damping, structural, microwave shielding, aircraft, spacecraft, automobile, and so forth. Particularly, the excellent EMI (Electromagnetic interference) shielding ability of these acrylonitrilebased polymer/graphene composites has been explored widely in microelectronics. This review focuses on the recent progress and new strategies in the development of different acrylonitrile-based polymer/graphene nanocomposites.
We investigated the effect of poly(ethylene‐co‐vinyl alcohol) (EVOH) concentration on the processability and physical properties of thermoplastic starch plasticized with glycerine and water. Waxy maize starch (Amioca), native corn starch (Melogel), and a treated high amylose corn starch (Hylon VII) were employed to explore the effect of starch type on blend properties. All the starches exhibited similar changes in properties with increasing EVOH content. The minimum injection pressure required for filling a standard test specimen (a measure of processability) decreased with increasing EVOH concentration and provided an indication of improved processability. Blends with high amylose corn exhibited higher injection pressures than the corresponding waxy maize or native corn starch blends. The ductility of all the thermoplastic starches was significantly increased upon the addition of EVOH. The waxy maize blends were stiffer and the high amylose corn blends exhibited higher elongation at low EVOH concentrations, but all the starch/EVOH blends exhibited similar physical properties when the EVOH concentration was ≥ 50 wt%. An investigation of physical properties of this blend series after long term aging from 10% to 90% relative humidity is in progress. Future studies include rheology, electron microscopy, and thermal analysis to more fully elucidate phase behavior in these binary blends.
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