MW-assisted synthesis of carboxymethyl tamarind kernel polysaccharide-g-polyacrylonitrile: Optimization and characterization

• Published in: Carbohydrate polymers Vol. 113; pp. 532 - 538
• Main Authors: Meenkashi, Ahuja, Munish, Verma, Purnima
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 26-11-2014; Elsevier
• Subjects: Acrylic Resins - chemical synthesis; Acrylic Resins - chemistry; Applied sciences; Carboxymethyl tamarind kernel polysaccharide; Exact sciences and technology; Microwave assisted graft copolymerization; Microwaves; Natural polymers; Physicochemistry of polymers; Polyacrylonitrile; Polymerization; Polysaccharides - chemistry; Response surface methodology; Seeds - chemistry; Starch and polysaccharides; Tamarindus - chemistry; X-Ray Diffraction; Microwave assisted graft copolymerization; Polyacrylonitrile; Response surface methodology; Carboxymethyl tamarind kernel polysaccharide; Graft copolymer; Peroxodisulfates; Experimental study; Grafting; Optimization; Thermal stability; Operating conditions; Polyelectrolyte; Acrylonitrile copolymer; Leguminosae; Dicotyledones; Morphology; Angiospermae; Plant origin; Microwave irradiation; Oside polymer; Spermatophyta; Polyacid; Tamarindus indica
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2014.07.041

•Microwave assisted synthesis of CMTKP-g-PAN was optimized.•Concentration of acrylonitrile and concentration of initiator (ammonium persulfate) significantly affected grafting efficiency.•Graft copolymerization improved the thermal stability of carboxymethyl tamarind kernel polysaccharide.
Microwave-assisted synthesis of graft copolymer of carboxymethyl tamarind seed polysaccharide and polyacrylonitrile was carried out. The effect of formulation and process variables on grafting efficiency of carboxymethyl tamarind kernel polysaccharide-g-poly(acrylonitrile) was studied using response surface methodology. The results revealed that the significant factors affecting grafting efficiency were concentrations of ammonium persulphate, acrylonitrile and interaction effects of ammonium persulphate and acrylonitrile concentrations. The optimal calculated parameters were found to be microwave exposure time—99.48s, microwave exposure power—160W, concentration of acrylonitrile—0.10% (w/v), concentration of ammonium persulphate—40mmol/l, which provided graft copolymer with grafting efficiency of 96%. The formation of graft copolymer was confirmed by FT-IR studies and validated by scanning electron micrographs. Thermogravimetric analysis indicated higher thermal stability of graft copolymer and X-ray diffraction study revealed increase in crystallinity on graft polymerization. Further, the graft copolymer showed pH dependant swelling.