The main characteristic peaks confirming the grafting of PMMA on NR backbone are 3.5 ppm (OCH3 protons of PMMA) and 5.1 ppm (C=CH2 protons of NR).
Table I shows details of the derived NR-gPMMA, determined according to Kalkornsurapranee.
It is common to obtain higher free PMMA (homopolymer) when using higher MMA content.
Therefore, G35, containing 35% grafted PMMA, showed higher PMMA homopolymer during graft copolymerization than G5.
Percentage of conversion and grafting efficiency were high, 80–90%.