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Grafting Lab Report

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The grafting was confirmed by FTIR and NMR (1H) spectra recorded on a Perkin-Elmer Model 599 B (KBr pellets) and Jeol JNM LA 400 Lambda spectrophotometer using D2O as a solvent and TMS as an internal reference, respectively. Grafted and pure samples were characterized by TGA (METTLER TA4000 SYSTEM) to compare their thermal stability. Scanning electron micrographs were taken on JEOL, JSM-840 SEM to investigate and compare surface morphology.
3. Results and discussion
The results of grafting reactions are given in Table -1 and Figures 1-6. The detailed mechanism proposed for the synthesis of XG-g-AA is same as described elsewhere for other polysaccharide based grafted copolymers of acrylamide.23
3.1 Determination of Optimal Reaction Parameters
3.1.1 Effect of Monomer and Initiator Concentration on %Grafting and %Grafting Efficiency
The effect of monomer concentration on percentage grafting (PG) and grafting efficiency (GE) is given in Table-1. The increase in PG from 0.09 till 0.39 moles was seen. The best PG was obtained for 0.39 …show more content…

The percentage of grafting ratio gives information about the extent of a synthetic polymer grafted onto the backbone polymer and hence it is a preferred parameter to study thermal stability of the grafted polymer. The thermal stability of graft copolymer can be compared at the onset temperature of decomposition and the percentage of weight loss for different stages of the decomposition. One can point out that there are two main degradation steps in the case of XG. Till 200˚ C, there is a 16.18% weight loss which is mainly due to water evaporation. Temperature of maximum weight loss is at 296.88˚ C and about 50% of the polymer is retained at the temperature of 400˚C, after which there is a continuous degradation. The second step assigned to cleavage of the XG’s side chains of galactose and xylose subunits and then ultimately the main chain which is β 1, 4 linked glucose

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