Abstract
RAFT non-aqueous emulsion polymerization of N-(2-acryloyloxy)ethyl pyrrolidone in n-dodecane using a poly(stearyl methacrylate) precursor is used to prepare sterically-stabilized nanoparticles, which are evaluated as a putative Pickering emulsifier.
Highlights
Cunningham and co-workers reported that PSMA14 is an effective steric stabilizer block for the Reversible addition–fragmentation chain transfer (RAFT) dispersion polymerization of NMEP in n-dodecane, with this Polymerization-induced self-assembly (PISA) formulation providing access to spheres, worms and vesicles.[17]
A PSMA36 precursor was employed for the RAFT non-aqueous emulsion polymerization of N-(2-acryloyloxy)ethyl pyrrolidone (NAEP) in n-dodecane to produce a series of sterically-stabilized PSMA36–PNAEPx diblock copolymer spheres with high NAEP conversions being achieved in all cases (≥98% within 5 h at 90 °C)
Systematic increases in both z-average diameter and Mp were observed for this unusual PISA formulation when targeting higher PNAEP degree of polymerization (DP), but only relatively poor RAFT control could be achieved
Summary
Reversible addition–fragmentation chain transfer (RAFT) polymerization[3,4,5,6] is the most widely used pseudo-living polymerization technique for PISA formulations.[2,7,8] This is no doubt owing to its well-known tolerance of monomer functionality and its compatibility with water,[9,10,11] non-polar solvents[12,13] and polar solvents.[14,15,16]Recently, Cunningham et al.[10,17,18] used RAFT polymerization to demonstrate that N-(2-methacryloyloxy)ethyl pyrroli-3762 | Polym. Synthesis of PSMAx–PNAEPy diblock copolymer nanoparticles by RAFT non-aqueous emulsion polymerization of NAEP in n-dodecane
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