Grafting of Poly(methyl methacrylate) Brushes from Magnetite Nanoparticles Using a Phosphonic Acid Based Initiator by Ambient Temperature Atom Transfer Radical Polymerization (ATATRP)

Table 3 Results from the GPC analysis of degrafted PMMAM _nth = ([M]_o/[I]_o)(M _wof Methyl methacrylate)(conversion)/100 = 1.5 × 10⁵(g/mol)

Sl. no	Time (h)	M _n × 10³(g/mol)	PDI	% weight loss^a	Grafting density^b	Initiator efficiency
1	3	17.6	2.46	75	0.85	0.43
2	6	27	2.39	80	0.74	0.40
3	9	32	2.36	87	1.07	0.55
4	12	42	1.94	88	0.89	0.45
5	15	50	2.00	90	0.92	0.47