双取代的丙烯酰胺衍生物N-丙烯酰基吗啉(NAM)的受控自由基聚合具有产生远螯聚合物的潜力,该聚合物的一端随后可以接枝到胶乳颗粒上。接枝后,聚合物的另一链端可用作分子生物学和生物医学中应用的固定化位点。使用两个带有相同官能丙酸基团(R)和两个不同Z基团的新链转移剂S C(Z)-SR进行可逆加成-断裂链转移(RAFT)的NAM受控聚合(CTA 1 )和苯基(CTA 2)。由CTA 1介导的NAM的RAFT聚合反应非常快(在65°C下不到半小时的转化率> 80%)。M̄的线性演化Ñ和低的多分散指数(中号瓦特/中号Ñ <1.2)与活性聚合的期待的特性一致。CTA 2导致M w w / M n宽(<1.4)。所得的CTA封端的聚合物进一步用于产生两亲性的polyNAM-嵌段-聚苯乙烯。这些α,ω-官能化的polyNAM链通过1 H NMR和MALDI-ToF质谱法表征。
The present invention relates to a method of forming polymer on the surface of polymer particles, the method comprising:
(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 stabiliser for said organic phase;
(ii) polymerising the one or more ethylenically unsaturated monomers under the control of the RAFT agent to form an aqueous dispersion of seed polymer particles;
(iii) crosslinking the seed polymer particles;
(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;
(v) increasing the temperature of the monomer swollen crosslinked seed polymer particles to expel at least some of the monomer therein onto the surface of the particles; and
polymerising at least the expelled monomer to form polymer on the surface of the particles.
The invention provides a method for preparing an aqueous dispersion of polymer particles comprising the following steps: (i) preparing a dispersion having a continuous aqueous phase, a dispersed organic phase comprising one or more ethylenically unsaturated monomers, and an amphiphilic RAFT agent as a stabiliser for said organic phase, and (ii) polymerising said one or more ethylenically unsaturated monomers under the control of said amphiphilic RAFT agent to form said aqueous dispersion of polymer particles, novel amphiphilic RAFT agents for use in this method, novel RAFT agents useful in making these amphiphilic RAFT agents and methods for their manufacture.
The invention provides a method for preparing an aqueous dispersion of polymer particles comprising the following steps: (i) preparing a dispersion having a continuous aqueous phase, a dispersed organic phase comprising one or more ethylenically unsaturated monomers, and an amphiphilic RAFT agent as a stabiliser for said organic phase, and (ii) polymerising said one or more ethylenically unsaturated monomers under the control of said amphiphilic RAFT agent to form said aqueous dispersion of polymer particles, novel amphiphilic RAFT agents for use in this method, novel RAFT agents useful in making these amphiphilic RAFT agents and methods for their manufacture.
Polymer obtained by the use of RAFT-agents and process of encapsulating of particulate material by said polymer.
申请人:The University of Sydney
公开号:EP2172491A1
公开(公告)日:2010-04-07
Polymer encapsulated particulate material that is 100 microns or less in size, wherein:
(a) said particulate material is encapsulated in a substantially uniform and continuous coating of a polymer which has at least in part been formed under the control of a RAFT agent; or
(b) the polymer which encapsulates the particulate material has at least in part been formed under the control of a RAFT agent, and wherein the particulate material is substantially uniformly dispersed throughout the polymer.
The invention provides polymer encapsulated solid particulate material that is 100 microns or less in size, wherein:
(a) said solid particulate material is encapsulated in a substantially uniform and continuous coating of a polymer that has at least in part been formed under the control of a hydrophilic RAFT agent; or
(b) the encapsulating polymer has at least in part been formed under the control of a hydrophilic RAFT agent, and wherein the solid particulate material is substantially uniformly dispersed throughout the encapsulating polymer.
The invention also provides related compositions, paints, fillers, adhesives, primers, toners, liquid inks, sealants, diagnostic products, therapeutic products and liquid dispersions.