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Non-core-shell polymer particles
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A technology of polymer particles and polymers, applied in coatings, latex paints, etc., can solve the problems of difficulty in mass production, limited practical research and application, etc.
Active Publication Date: 2022-01-14
THE UNIV OF SYDNEY
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[0011] Despite their unique properties, practical studies and applications of such Janus particles, especially submicron Janus particles, have so far been limited due to the difficulty of their mass-fabrication
Method used
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[0128] The preparation method of non-core-shell polymer particles outlined in WO2010 / 096867 involves:
[0129] (i) providing a dispersion comprising a continuous aqueous phase, a dispersed organic phase comprising one or more ethylenically unsaturated monomers, and a RAFT agent as a stabilizer for said organic phase;
[0130] (ii) polymerizing one or more ethylenically unsaturated monomers under the control of the RAFT agent to form an aqueous dispersion of seed polymer particles;
[0131] (iii) crosslinking the seed polymer particles;
[0132] (iv) swelling the crosslinked seed particles with one or more ethylenically unsaturated monomers to form an aqueous dispersion of monomer-swollen crosslinked seed polymer particles;
[0133] (v) increasing the temperature of the monomer-swollen crosslinked seed polymer particles to expel at least some of the monomer therein onto only a portion of the surface of the particles; and
[0134] (vi) polymerizing at least the discharged mono...
Embodiment 1
[0237] Example 1. Preparation of various non-core-shell polymer particles by continuous emulsion polymerization process
Embodiment 1a
[0238] Example 1a. Using 2-{[(butylmercapto)thiocarbonyl]mercapto}propionic acid to prepare poly[(butyl acrylate)-blocks containing an average of 10 monomer units per chain at a molar ratio of 1:1- (acrylic acid)] Macromolecular RAFT agent.
[0239] In a 50 mL round bottom flask, prepare 2-{[(butylmercapto)thiocarbonyl]mercapto}propionic acid (1.9 g, 8.0 mmol), 2,2'-azobis Isobutyronitrile (AIBN) (0.07 g, 0.4 mmol), acrylic acid (3.0 g, 41.0 mmol). It was stirred magnetically and sparged with nitrogen for 10 minutes. The flask was then heated at 70° C. for 3 hours with continuous stirring. To this polymer solution, butyl acrylate (5.3 g, 41.2 mmol) and AIBN (0.07 g, 0.4 mmol) were added. The flask was sealed again, purged with nitrogen for 10 minutes, and heated for an additional 3 hours with constant magnetic stirring. The final copolymer solution had 55.9% solids.
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Abstract
The present invention relates to a method which uses non-core-shell polymer particles to form polymer film on a pre-formed solid substrate surface, said non-core-shell polymer particles comprising two covalently coupled polymer regions of different molecular composition, wherein (a) one of the two polymer regions is a crosslinked RAFT polymer region and the other polymer region is a film forming polymer region, (b) the crosslinked RAFT polymer region comprising particle aggregation prevention means selected from one or more of charged and steric stabilising functionality, and (c) the film forming polymer region comprising 0 - 3 wt. % of charged polymerised monomer residues relative to the total amount of polymerised monomer residues present in that region.
Description
technical field [0001] The present application relates generally to non-core-shell polymer particles, and more particularly to a method of using non-core-shell polymer particles to form polymer films on the surface of preformed solid substrates. The present application also relates to a solid substrate having on its surface non-core-shell polymer particles derived from a polymer film. Background technique [0002] Polymeric particles are used in a wide variety of applications. For example, they can be used in coatings (eg, lacquers), adhesives, fillers, primers, sealants, pharmaceutical, cosmetic, agricultural, explosives, and diagnostic applications. [0003] In recent years, there has been increasing interest in the development and use of micron or submicron heterogeneous polymer particles (i.e., polymer particles containing at least two polymer phases or domains, each with a different molecular composition) . Heterogeneous polymer particles include those with core-shel...
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