| Popis: |
Poly(ether- urethane) macroiniferters based on diphenyl methane- 4,4′-diisocyanate (MDI), polypropylene glycol(PPG), M.W 1000 and 1, 4- Butanediol(BD) and 1,1,2,2- Tetraphenyl ethane diol(TPED) as chain extender have been synthesized using methyl ethyl ketone(MEK) as solvent. The reactions were catalysed by dibutyl tin dilaureate(DBTDL). Several polyurethane macroiniferters(PUMI) were synthesized by varying the amount of TPED in the mixture of chain extender diols. These polyurethane macroiniferters were then used to synthesize polyurethane – block – polyacrylamide copolymers (PUMI-b-PAM) through thermally induced living radical polymerization. The homopolymers, polyacrylamide (PAM) were also removed by soxhlet extraction with methanol-water mixture and finally with acetone. Polyurethane macroiniferters and the corresponding block copolymers were characterized by FTIR, 1H- NMR and SEM measurements. The thermal behaviour of the resultant polymers was also studied by TGA. |
