Heterofunctional polymers and core–shell nanoparticles via cascade aminolysis/Michael addition and alkyne–azide click reaction of RAFT polymers
作者:Zesheng An、Wei Tang、Minghong Wu、Zheng Jiao、Galen D. Stucky
DOI:10.1039/b816578e
日期:——
A convenient methodology involving cascade aminolysis/Michael addition and alkyneâazide click reaction was developed for polymers and polymeric coreâshell nanoparticles, synthesized via RAFT-mediated homogeneous and heterogeneous polymerisation processes, respectively, to provide well-defined heterofunctional polymeric materials.
作者:Ke Zhang、Yongping Zha、Bo Peng、Yongming Chen、Gregory N. Tew
DOI:10.1021/ja407381f
日期:2013.10.30
Cyclic brush polymers represent an exciting new macromolecular topology. For the first time, this new topology has been combined with metallo-supramolecular interactions to construct novel cyclic brush polymers. Here, ring-expansion metathesis polymerization was used to synthesize a universal cyclic template with a polynorbornene backbone, which was further modified with the metal-chelating synthon terpyridine. The terpyridine side chains served as the key supramolecular unit for the creation of cyclic polymer brushes and gels. This metallo-supramolecular functionality allowed direct visualization of the cyclic brush polymers by transmission electron microscopy for the first time. This demonstration should open a new area in which supramolecular interactions are used to build an array of novel cyclic brush copolymers as well as other cyclic-polymer-based architectures generating new materials.
Highly Controlled Open Vessel RAFT Polymerizations by Enzyme Degassing
作者:Robert Chapman、Adam J. Gormley、Karla-Luise Herpoldt、Molly M. Stevens
DOI:10.1021/ma5021209
日期:2014.12.23
Intolerance to oxygen is a key limitation in many reactions and particularly in controlled radical polymerizations. Here we introduce the use of enzymes such as glucose oxidase (GOx) to deoxygenate reversible additionfragmentation chain transfer polymerizations (Enz-RAFT), facilitating the preparation of highly controlled polymers in vessels open to ambient oxygen. Because the removal of oxygen is so efficient, very low concentrations of GOx and initiator can be used, enabling excellent control which is demonstrated by pseudoliving polymerization kinetics and the preparation of multiblock copolymers with narrow molecular weight distributions (M-w/M-n < 1.15). GOx retains sufficient activity to facilitate polymerization not only in aqueous solutions but also in a range of water/organic solvent mixtures, and we demonstrate the use of this technique to perform open vessel Enz-RAFT polymerizations in various methanol and dioxane/water mixtures.
Gold Nanoparticle Conjugates and Uses Thereof
申请人:Boyes Stephen G.
公开号:US20090060839A1
公开(公告)日:2009-03-05
The disclosure generally relates to formation of polymers grafted to or polymerized from the surface of gold nanoparticles. The polymers are functionalized to include therapeutic agents and/or targeting agents at their surface, thereby allowing both therapeutic and targeting compounds to be directed to specific cells in a patient.
Biomedical devices
申请人:Linhardt Jeffrey G.
公开号:US20100317809A1
公开(公告)日:2010-12-16
Biomedical devices such as silicone hydrogels formed from a polymerization product of a mixture comprising (a) a siloxane-containing homopolymer comprising one or more thio carbonyl thio fragments of a reversible addition fragmentation chain transfer (RAFT) agent; and (b) one or more biomedical device-forming monomers are disclosed.