Sunita Rattan; Teena Sehgal
Abstract
Radiation grafting of the Track Etched Membranes (TEMs) is a versatile tool for the formation of stimulus responsive membranes which change their permeation properties in response to environmental stimuli such as pH or temperature. Stimuli-responsive polymeric membranes have attracted the attention of ...
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Radiation grafting of the Track Etched Membranes (TEMs) is a versatile tool for the formation of stimulus responsive membranes which change their permeation properties in response to environmental stimuli such as pH or temperature. Stimuli-responsive polymeric membranes have attracted the attention of researcher all around the world owing to their potential applications in the fields of controlled drug delivery, bio separation, water treatment, and chemical sensors. Acrylic acid (AAc), well known for its novel pH-sensitive behavior in aqueous media was successfully grafted on the surface and in the pores of polycarbonate track etched membrane (PCTE). The influence of reaction parameters such as monomer concentration, reaction time, temperature and concentration of the initiator on the grafting yield was investigated in detail. The membranes were characterized through Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) techniques. The pH-responsive behaviour of the PCTE-g-AAc membranes was studied. The PCTE-g-AAc membranes exhibit fast and reversible response to the environmental pH.
Deepak Pathania; Reena Sharma;Susheel Kalia
Abstract
The graft copolymerization of acrylic acid onto gelatinized potato starch has been carried out at 70ºC using chromic acid as an initiator. The different reaction parameters such as reaction temperature, initiator and monomer concentrations were optimized to get the maximum percentage grafting. The ...
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The graft copolymerization of acrylic acid onto gelatinized potato starch has been carried out at 70ºC using chromic acid as an initiator. The different reaction parameters such as reaction temperature, initiator and monomer concentrations were optimized to get the maximum percentage grafting. The maximum grafting (93.54%) was observed at 60 ºC, 0.57 molL-1 of acrylic acid and 0.03 mmolL-1 of chromic acid. The grafted samples were evaluated for other physico-chemical properties such as swelling behavior, moisture absorption and chemical resistance. The grafted samples were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA) techniques. The graft copolymers have been successfully used for the removal of metal ions and organic dyes from aqueous system.
Deepak Pathania; Reena Sharma
Abstract
The graft copolymerization of methacrylic acid onto gelatinized potato starch has been carried out at 70 0 C using chromic acid as initiator. The different reaction parameters such as effect of temperature, initiator and monomer concentrations were optimized to determine the maximum percentage grafting. ...
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The graft copolymerization of methacrylic acid onto gelatinized potato starch has been carried out at 70 0 C using chromic acid as initiator. The different reaction parameters such as effect of temperature, initiator and monomer concentrations were optimized to determine the maximum percentage grafting. The maximum grafting efficiency of 87.5% was optimized at reaction temperature (60 0 C), monomer concentration (0.81molL -1 ) and initiator concentration (0.02 mmol.L -1 ). The grafted samples were evaluated for other physico-chemical properties such as swelling behavior, moisture absorption and chemical resistance. The grafted samples were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) techniques. The additional peaks observed in FTIR spectra of grafted samples confirmed the grafting of monomer onto gelatinized starch. The grafted co-polymers have been successfully used for the removal metal ions and organic dyes from aqueous system.