Rapid Synthesis of Graft Copolymer of MMA OntoSaccharum spontaneumL. Under Microwave Irradiation for Enhanced Thermal Modifications

Abstract

In this article, synthesis of graft copolymers of methyl methacrylate (MMA) onto Saccharum spontaneum L. fiber under the influence of microwave radiation (MWR) was carried out. Different reaction parameters such as time, initiator molar ratio, monomer concentrations, microwave power, pH, and solvent were optimized for maximum graft yield (62.3%). The graft copolymers thus formed were characterized by FT-IR, SEM, XRD, and TGA, DTA, and DTG techniques. Moreover, graft copolymers have been found to be more moisture resistant and also showed higher chemical and thermal resistance.

Synthesis and characterization of corn starch based green composites reinforced with Saccharum spontaneum L graft copolymers prepared under micro-wave and their effect on thermal, physio-chemical and mechanical properties

“…Under micro-wave irradiation, graft copolymerization of different vinyl monomers onto various natural back-bones have been reported worldwide [20e25] for enhancing of moisture retardance, chemical resistance and thermal stability. In continuation to our early work, since chemical modification of Saccharaum spontaneum fibers resulted in increased hydrophobicity, thermal and chemical resistance of the material through graft copolymerization with MMA [26] and its binary monomer mixtures MMA þ AAm, MMA þ AA and MMA þ AN under MWR have already been carried-out by the present authors, therefore, the objective of the present work is to develop corn starch matrix based green composites and enhancement of mechanical and physico-chemical properties through reinforcement with different graft copolymers of S. spontaneum. The composites prepared were further subjected for thermal and biodegradation evaluation.…”

“…This could easily be related with the percentage graft yield. The % graft yield was calculated from the % increase in the weight of fibers after the grafting of monomers and was measured by the method described earlier by the present authors [26]. After the grafting, the homopolymer was removed from the fibers by refluxing with acetone, hot water and dimethylformamide and fibers dried at 50 C till constant weight.…”

Induction of Physico-Chemical and Thermal Resistance onSaccharum spontaneumL by Grafting Under Microwave Irradiation

“…The different optimized parameters were: reaction time, 120 sec; pH, 7.0; solvent, 25 ml; FAS:KPS, 1: 0.25; MMA, 2.45 Â 10 À3 mol=L, MW power, 70%. The optimum graft yield was 62.3% [24]. Graft copolymerizations of MMAþAAm, MMAþAN, and MMAþAA binary mixtures onto S. spontaneum fiber under optimized reaction conditions using MMA (2.45 Â 10 À3 mol L À1 ) as the principal monomer showed 88.9% (AAm; 0.35 Â 10 À3 mol L À1 ), 81.7% (AN; 3.79 Â 10 À3 mol L À1 ) and 75.6% (AA; 2.91 Â 10 À3 mol L À1 ) graft yield, respectively ( Table 1).…”

“…with acetylated Saccharum spontaneum L in air [23], 62.3% in 120 secs. with natural fiber under microwave radiation (MWR) [24] and 72.2% in 90 secs. with acetylated Saccharum spontaneum L under MWR [25].…”

One Decade of Microwave‐Assisted Polymerizations: Quo vadis?

“…Kaith and coworkers followed a similar strategy for grafting MMA onto Saccharum spontaneum cellulose. [236] The grafting reaction was initiated with K 2 S 2 O 8 and performed under microwave irradiation in a domestic microwave oven. The temperature was monitored by inserting a thermometer in the reaction mixture at the end of the reaction.…”