Preeti Lodha

This study presents the effect of Phytagel ® and stearic acid modification of soy protein isolate... more This study presents the effect of Phytagel ® and stearic acid modification of soy protein isolate (SPI) based 'green' resins on their biodegradation in composting environment. The composting process was monitored for up to 10 weeks and the degradation of the resins was ...

Characterization of Phytagel® modified soy protein isolate resin and unidirectional flax yarn reinforced “green” composites

Polymer Composites, 2005

The mechanical properties and moisture resistance of the soy protein isolate (SPI) resin and flax... more The mechanical properties and moisture resistance of the soy protein isolate (SPI) resin and flax yarn rein-forced composites were improved significantly by incor-poration of a poly-carboxylic acid based modifier, Phyta-gel . SPI and Phytagel were blended to form an ...

Thermal and mechanical properties of environment-friendly ‘green’ plastics from stearic acid modified-soy protein isolate

Industrial Crops and Products, 2005

Most plastics, at present, are petroleum-based and do not degrade over many decades under normal ... more Most plastics, at present, are petroleum-based and do not degrade over many decades under normal environmental conditions. As a result, efforts towards developing environment-friendly and biodegradable 'green' plastics for various commercial applications have gained significant momentum in recent years. Soy protein isolate (SPI)-based 'green' plastics have been shown to suffer from high moisture sensitivity and low strength. These properties have limited their use in most commercial applications. They are also difficult to process into sheets without any plasticizer. The commonly used plasticizer, glycerol, tends to leach out over time producing time-dependent properties, which is highly undesirable for commercial applications. The objectives of the current research are to reduce the moisture sensitivity and simultaneously improve the tensile properties of SPI by incorporation of stearic acid without affecting its biodegradability. The effect of stearic acid and glycerol on the tensile and thermal properties of SPI has been characterized using various techniques to determine the interaction mechanisms between stearic acid and soy protein. Mechanical properties were characterized using Instron tensile tester. Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA) and X-ray diffraction (XRD) techniques have been used to determine the effects of stearic acid and glycerol on the surface chemistry, thermal transitions and thermal degradation of the stearic acid modified SPI plastic (resin). The tensile test results show that Young's modulus increased on increasing the stearic acid content, reaching the maximum value at about 25% (by weight of SPI powder) stearic acid. Further increase in stearic acid content from 25 to 30% led to a reduction in Young's modulus. The moisture content, fracture stress, strain, and energy at break decreased steadily on increasing the stearic acid from 0 to 30% for SPI containing 30% glycerol. At 25% stearic acid content, the modulus and the fracture stress increased significantly, whereas the fracture strain, energy at break and the moisture content decreased on reducing glycerol content. Scanning electron microscopy photomicrographs of fractured surfaces showed a layered structure for stearic acid modified-SPI resin. TGA measurements showed that the thermal degradation of stearic acid modified-SPI resin initiated at higher temperature than the SPI resin. DSC scans indicated that stearic acid modified-SPI resin had a small degree of crystallinity, which was confirmed by X-ray diffraction patterns. Modifying SPI resin with stearic acid has been successful in obtaining better tensile and thermal properties as well as reduced moisture sensitivity without any processing problems.

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Characterization of stearic acid modified soy protein isolate resin and ramie fiber reinforced ‘green’ composites

Composites Science and Technology, 2005

The effects of stearic acid on the physical, tensile, moisture, thermal and micro-structural prop... more The effects of stearic acid on the physical, tensile, moisture, thermal and micro-structural properties of the soy protein isolate (SPI)-based resin have been investigated. Fully biodegradable, environment-friendly, unidirectional, ramie fiber reinforced ‘green’ composites were also successfully fabricated using SPI and stearic acid modified SPI (MSPI) resins and characterized for their tensile and flexural properties. The fiber/resin interfacial shear strength was

Consolidation of Non-Woven Textile Fibres

Acrylic Fiber with Modified Property and a Process for Making Therefor

A Lyocell Fiber with Modified Property and a Process for Making Therefor

A Process for Charging a Polymeric Product with Attribute Imparting Agent (S)

Process for Manufacturing Low-Fibrillating Cellulosic Fiber

Characterization of interfacial and mechanical properties of green composites with soy protein isolate and ramie fiber

Journal of materials science, 2002

... et al. [12], Thames and Zhou [13], Liang et al. [14] and Lodha and Netravali [15, 16] have us... more ... et al. [12], Thames and Zhou [13], Liang et al. [14] and Lodha and Netravali [15, 16] have used soy protein as resin to make green composites. ... We would also like to acknowledge the support provided by Dr. Yash Kamath, TRI/Princeton, Princeton, NJ for density measurements. ...

A viscose fiber with modified property and a process for making therefor

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