Synthesis, characterisation and Pickering emulsifier performance of poly(stearyl methacrylate)-poly(N -2-(methacryloyloxy)ethyl pyrrolidone) diblock copolymer nano-objects via RAFT dispersion polymerisation in n -dodecane

Polymer Chemistry
Victoria J CunninghamOsama M Musa

Abstract

A near-monodisperse poly(stearyl methacrylate) macromolecular chain transfer agent (PSMA macro-CTA) was prepared via reversible addition-fragmentation chain transfer (RAFT) solution polymerisation in toluene. This PSMA macro-CTA was then utilised as a stabiliser block for the RAFT dispersion polymerisation of a highly polar monomer, N-2-(methacryloyloxy)ethyl pyrrolidone (NMEP), in n-dodecane at 90 °C. 1H NMR studies confirmed that the rate of NMEP polymerisation was significantly faster than that of a non-polar monomer (benzyl methacrylate, BzMA) under the same conditions. For example, when targeting a PSMA14-PNMEP100 diblock copolymer, more than 99% NMEP conversion was achieved within 30 min, whereas only 19% BzMA conversion was obtained on the same time scale for the corresponding PSMA14-PBzMA100 synthesis. The resulting PSMA-PNMEP diblock copolymer chains underwent polymerisation-induced self-assembly (PISA) during growth of the insoluble PNMEP block to form either spherical micelles, highly anisotropic worms or polydisperse vesicles, depending on the target DP of the PNMEP chains. Systematic variation of this latter parameter, along with the solids content, allowed the construction of a phase diagram which enabled pure mor...Continue Reading

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Citations

Oct 5, 2019·Journal of the Science of Food and Agriculture·Mingzhu MeiZhiling Liu
Jul 12, 2019·Proceedings. Mathematical, Physical, and Engineering Sciences·Gregory N SmithSteven P Armes
Dec 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Saul J Hunter, Steven P Armes
Aug 1, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Qinmo LuoEmily Pentzer

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Methods Mentioned

BETA
dynamic
transmission electron microscopy
SMA
PISA
NMR
optical microscopy

Software Mentioned

Cirrus GPC
Motic Images Plus

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