Table 1.
Polymer | [M]:[CTA] (−) |
[CTA]:[I] (−) |
Conversiona (%) |
Mn, thb (g.mol−1) |
DPn, thb (−) |
Mn, SECc (g.mol−1) |
DPn, SECc (−) |
Mw/Mnc (−) |
Mn, NMRd (g.mol−1) |
DPn, NMRd (−) |
Mn, PHPMAe (g.mol−1) |
DPn, PHPMAe (−) |
Mw/Mne (−) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 250 | 2 | 73 | 46000 | 182 | 23000 | 91 | 1.69 | 50100 | 199 | 24900 | 175 | 1.45 |
2 | 350 | 2 | 70 | 61700 | 245 | 28700 | 147 | 1.70 | 67800 | 269 | 34800 | 253 | 1.47 |
3 | 500 | 2 | 71 | 89500 | 355 | 51600 | 204 | 1.72 | 93700 | 372 | 47800 | 336 | 1.57 |
4 | 800f | n.a. | 76 | 153000 | 608 | 62000 | 246 | 1.38 | n.a. | n.a. | 76000 | 539 | 1.41 |
Determined by 1H-NMR.
Theoretical number-average molecular weight/degree of polymerization determined from conversion (1H-NMR) and [M]:[CTA].
Number-average molecular weight/degree of polymerization/polydispersity from DMF SEC relative to PMMA standards.
Number-average molecular weight/degree of polymerization determined from 1H-NMR spectroscopy from comparison of the RAFT agent end group to the -CH2 backbone peaks.
Number-average molecular weight/degree of polymerization/polydispersity determined from DMF SEC after post-polymerization modification with 2-hydroxypropylamine to yield poly(2-hydroxypropyl methacrylamide).
Monomer to initiator ratio used was 800 : 1.