16 research outputs found
Recently emerging trends in thermal conductivity of polymer nanocomposites
Due to escalating power densities in electronics, information, communication, energy storage, aerospace, and automobile technologies, heat dissipation has become immensely essential for the efficient performance and reliability of photonic, electronics, optoelectronics, and other devices in order to proactively prevent premature failure due to overheating. The functionalization and synergistic inclusion of thermally conducting nanoparticles such as carbon derivatives and metallic and ceramic fillers into polymer matrices have resulted in development of thermally conducting polymer nanocomposites. This has enlarged the scope of application of these materials in areas hitherto restricted due to poor thermal conductivity and, therefore, opened broad windows of opportunities for polymer nanocomposites as emerging alternative replacements for metal components in various applications where effective heat dissipation is compulsory for device performance. Thus, this paper critically discusses globally emerging technologies applied in the development of thermally conductive polymer nanocomposites for various industrial applications
Hibiscus cannabinus fiber/PP based nano-biocomposites reinforced with graphene nanoplatelets
The essence of the present research is based on reinforcement mechanism of hibiscus cannabinus fiber (KF) and graphene nanoplatelets (GNP) on mechanical and thermal properties of hybrid hibiscus cannabinus fiber/polypropylene (PKMG 1–5 phr) nano-biocomposites. TGA results revealed inclusion of KF and GNP enhanced charring and thermal stability of the bio-nanocomposites. DSC analysis revealed improved melting and crystallization temperatures of the materials. Flexural modulus significantly increased on inclusion of 20 wt.% kenaf fiber and 5 phr GNP. XRD studies confirmed KF and GNP induced nucleation of β-crystals of PP which improved toughness and impact properties of the nano-biocomposites especially at 3 phr
Influence of nanotechnology in polymeric textiles, applications, and fight against COVID-19
Influence of exfoliated graphene nanoplatelets on flame retardancy of kenaf flour polypropylene hybrid nanocomposites
In this study, we report influence of exfoliated graphene nanoplatelets on the flame retardancy and thermal properties of hybrid kenaf flour graphene nanoplatelets polypropylene nanocomposites. Mass loss calorimeter, Limiting oxygen index and Universal laboratories-94-V fire test instruments were employed for flammability investigations. Fire results revealed improved flame retardancy of composites through enhanced fire performance index, prolonged time to ignition and reduced fire growth index. Heat release rate, peak heat release rate, time to peak heat release rate, mass loss rate and total heat release rate essential for the protection of human lives and properties during actual fire scenario were enhanced. Incorporation of graphene nanoplatelets improved flame retardancy of the materials. The GNP char structure improved flame retardancy by acting as heat shield and protective layering on surface of the materials thereby hindering transfer of oxygen and heat from the fire region to the underlying matrix while simultaneously inhibiting the penetration of flammable gases from underlying matrix to the combustion zone thereby cutting-off the fire track
The Vibrant Interplay of Light and Self‐Reporting Macromolecular Architectures
Inspired by nature, notable efforts have been made towards the exploration of self-reporting polymers within the last decades. Whereas the majority of the previously reported self-reporting polymers deliberately relies on a diverse set of mechanisms triggered via different stimuli (e.g., mechanical, thermal, pH, solvation, light, and chemical amongst others), light plays a ubiquitous role not only as a remote trigger, but also as non-destructive readout signal for the practical applications of self-reporting polymers. Due to the ever-growing interest within the respective field (e.g., load bearing materials, nanotechnology, biomedicine, or theranostics), herein a synthetic overview is presented with the aim to provide an informative perspective on challenges facing the vibrant interplay of light and self-reporting macromolecular architectures
Electrical, thermal and flammability properties of conductive filler kenaf-reinforced polymer nanocomposites
Exfoliated graphene nanoplatelets (3 phr) were incorporated into polypropylene with increasing concentration of treated and untreated kenaf flour 0, 10, 20, 30, and 40 wt%, respectively, and prepared via melt-extrusion using corotating twin screw extruder. The resulting nanocomposites were characterized in terms of electrical, thermomechanical, thermal conductivity, thermal behavior, heat deflection temperature (HDT), and mechanical, morphological, and structural properties. Fourier transform infrared spectroscopic results demonstrate that the fibers interacted with the matrix and affected the mechanical behavior. The effective thermal conductivities decreased with increasing fiber content, while HDT of the nanocomposites was found to significantly increase, respectively. The electrical properties decreased with increasing fiber content. However, despite the decline in electrical conductivity, the composites were still relatively conductive for applications such as sensors and electromagnetic shielding after fiber inclusion
A review on innovations in polymeric nanocomposite packaging materials and electrical sensors for food and agriculture
The application of polymer nanocomposites packaging materials in industrial, food and agricultural products is a superior alternative to traditional packaging materials such as glass, paper, and metals due to their functionalization, flexibility, and minimal cost. However, usage of these materials has been hindered due to their inferior mechanical and barrier behaviors, which are susceptible to improvement through inclusion of functionalized reinforcing macro- or nano?llers. Furthermore, most reinforced materials exhibit inferior matrix–?ller interfacial interactions, which are enhanced with reducing ?ller dimensions. Hence, this review elucidates functionalization of composites interfacial interaction and its relationship to enhancement of the properties of packaging materials, especially antimicrobial tendencies, enzyme immobilization behavior, biosensing affinity, and so on. Thus, a fundamental understanding of interfacial structure and its relationship to the overall improvement of properties are presented. Therefore, nanomaterials, such as cellulose, nanoclay, halloysite nanotubes, carbon allotropes (graphene and carbon nanotubes), silica, and so on, are discussed relative to their surface treatment approaches and effects on composites films properties for effective packaging. Recently, emerging innovations in nanostructured polymeric composite materials and electrical-sensors, their current applications and future outlook as food, agricultural and industrial packaging materials are also herewith elucidated