« PrécédentContinuer »
(12) United States Patent ao) Patent No.: us 6,627,314 B2
Matyjaszewski et al. (45) Date of Patent: Sep. 30,2003
(54) PREPARATION OF NANOCOMPOSITE STRUCTURES BY CONTROLLED POLYMERIZATION
(75) Inventors: Krzysztof Matyjaszewski, Pittsburgh, PA (US); Jeffrey Pyun, Pittsburgh, PA (US)
Von Werne, Timothy and Patten, Timothy E.—Preparation of Structurally Weil-Defined Polymer—Nanoparticle Hybrids with Controlled/living Radical Polymerizations—J. Am. Chem. Soc. 1999, 121, 7409-7410. Shen, Youquing; Zhu, Shiping; Zeng, Faquan and Pelton, Robert—Suported Atom Transfer Radical Polymerization of Methyl Methacrylate Mediated by CuBr-Tetraethyldiethylenetriamine Grafted onto Silica Gel—Journal of Polymer Science: Part A: Polymer Chemistry, vol. 39, 1051-1059 (2001); John Wiley & Sons, Inc.
Caruso, Frank—Nanoengineering of Particle Surfaces— Adv. Mater. 2001, 13, No. 1, Jan. 5, 11-22—Wiley-VCH Verlag GmbH.D-69469 Weinheim, 2001.
* cited by examiner
Primary Examiner—Leszek Kiliman
(74) Attorney, Agent, or Firm—Kirkpatrick & Lockhart
The present invention describes preparation of nanocomposite particles and structures by polymerizing monomers onto a functional inorganic colloid comprising a polymerization initiation site. The polymerization process is preferably a controlled/living polymerization process, including but not limited to, atom transfer radical polymerization and stable free radical polymerization. The nanocomposite particles can self-organize in solution, on surfaces or in films forming nanocomposite structures. Tethered AB block nanocomposite particles bring size control, solubility control and control over micro- and macro-functionality to the particles. The process may be catalyzed by a transition metal complex which participates in a reversible redox cycle with at least one of the group and a compound having a radically transferable atom or group, to form a nanocomposite particle with a tethered polymer chain. The process may be continued to form tethered copolymer chain. The particle may be silicon based including, for example, silica, silicates and polysilsesquioxane. A nanocomposite structure may be formed by casting, depositing or forming the material including nanocomposite particles.
64 Claims, 19 Drawing Sheets
Si03/2) Multi-armed p(Sty) Polymer-Particle Mn Nmr= 6 x 106 g/mol