. Author manuscript; available in PMC: 2012 Jul 27.

Published in final edited form as: J Am Chem Soc. 2011 Jun 30;133(29):11147–11153. doi: 10.1021/ja2012164

Table 1.

The Molecular Weight of Polymers 1–4.

Polymers	¹H NMR	SEC

	M̅n^a(Da)	M̅n^b(Da)	PDI^b
1	4,700	6,070	1.42
2	5,220	7,400	1.38
3	5,200	7,420	1.35
4	5,288	7,500	1.30

The number-average molecular weight (M̅n) was determined by ¹H NMR.

(M̅n) and polydispersity index (PDI) were measured by SEC; PDI is the ratio of weight-average molecular weight (M̅_w) and (M̅n). The difference in the molecular weight obtained by SEC and ¹H NMR is related to differences in the hydrodynamic volume of the polymer in chloroform compared to polystyrene standards. ¹H NMR provides a more accurate method for average molecular weight determination.