• SUSMITA DEY SADHU

      Articles written in Bulletin of Materials Science

    • Thermo-mechanical investigation of PEG–PVA biohybrid active film grafted with copper nanoparticles for packaging applications

      BHASHA SHARMA AVINASH SANDILYA SACHIN SHARMA MEENAKSHI GARG SUSMITA DEY SADHU

      More Details Abstract Fulltext PDF

      The global fabrication of conventional plastics has increased attributes to the prodigious applications. The product developed in the present work is a vitreous alternative to the traditional, non-biodegradable, crude-based plastics,which degrades axiomatically. It compensates for the exceedingly depleting oil reserves and truncates the plastic waste. This research emphasizes the evolution of sustainable active food packaging film to proliferate the shelf life of a productand to retain the nutritional content. Here, copper nanoparticles are reinforced into the biohybrid film made up of using polyvinyl alcohol, polyethylene glycol and citric acid for an active copper releasing packaging system, which improves the barrier property of the film. Scanning electron microscopy micrographs of the copper nanoparticles and the reinforced films delineate the uniform distribution of the nanoparticles in the hybrid matrix. Biodegradation test examined the 16.69% for 1 phr copper-loaded film, which is high in contrary to others. The mechanical properties and heat stability of the biocomposite film meliorated significantly by the inclusion of 1% Cu nanoparticles. The water solubility of the nano-film ranges from 3.64 to 100%, depending upon the extent of crosslinking. The resultant hybrid film is versatile and can be utilized both as cured and uncured forms. The aforementioned properties make it pertinent for drug-delivery applications too.

    • Effect of varying ratio of starch in melamine-formaldehyde/starch based adhesive and its properties

      RISHI RAJ SUSMITA DEY SADHU

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      In this study, the adhesion strength of melamine–formaldehyde (MF) resin-based adhesives is improved manifolds by incorporating a little amount of starch in it for adhering Denim cloth. The effect of varying starch content inthe adhesive has also been studied. The reaction conditions of the adhesive preparation with respect to time, temperature and pH have been optimized. To understand the right storage condition, the denim fabric after application of adhesives isstored at different conditions of humidity and temperature. Thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) have been performed to study the effect of starch on the thermal stability and to study the interactions between the chemical species of the adhesive, respectively. Scanning electron microscopy (SEM) was done to study themorphology of the adhesive. At elevated temperature, the adhesion strength was found to improve and there was no effectof high humidity (90% RH) on the adhesion strength. The effect of temperature on viscosity changes of the adhesives was also recorded. Further, the chemical resistance of the adhesive in various solvents having different pH and polarity are also studied.

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      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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      Posted on July 25, 2019

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