Table 1. Summary of the Sterically Stabilized Latexes Used in This Work.
entrya | target composition | conversionb (%) | Dhc (nm) | DTEMd (nm) |
---|---|---|---|---|
1 | P2VP32–PBzMA300 | 99 | 139 (0.098) | 88 ± 7 |
2 | P2VP67–PBzMA300 | 99 | 149 (0.057) | 102 ± 8 |
3 | PKSPMA32–PBzMA300 | 99 | 177 (0.040) | 132 ± 4 |
4 | PEGMA-stabilized P2VP | 96 | 222 (0.052) | 173 ± 5 |
5 | PBzMA | 96 | 289 (0.051) | 234 ± 21 |
Entries 1 and 2 were prepared via RAFT aqueous emulsion polymerization at 70 °C using P2VP as a macromolecular chain-transfer agent (macro-CTA) and at pH 2.5 and 3.0, respectively. Entry 3 was prepared via RAFT emulsion polymerization at 70 °C using PKSPMA as a macro-CTA in a methanol/water mixture at an alcohol content of 33% w/w. Entry 4 was prepared via conventional emulsion polymerization at 60 °C using 10% w/w nonionic PEGMA stabilizer, 10% w/w Aliquot 336 surfactant, and 1% w/w DVB cross-linker. Entry 5 was synthesized via RAFT miniemulsion polymerization at 70 °C at a dispersed phase concentration of 20% w/w and using 2.4% w/w hexadecane and 7.8% w/w Lutensol TO 20 relative to BzMA ([BzMA]:[PETTCCP]:[AIBN] = 600:2:1).
Monomer conversions were determined via gravimetry.
Mean hydrodynamic diameter obtained via DLS, where DLS polydispersity index values are indicated in brackets.
Mean TEM particle diameters were calculated by analyzing 200 particles using ImageJ software.