نتایج جستجو برای: block copolymer

تعداد نتایج: 167435  

Journal: :Journal of nanoscience and nanotechnology 2008
Quoc Dat Nghiem Dong-Pyo Kim Sang Ouk Kim

The fabrication of SiC ceramic materials with an ordered nanostructure through the direct pyrolysis of a self-assembled inorganic-organic block copolymer has generally been unsuccessful even though the versatile processibility has been demonstrated with organic-organic block copolymers. Here we report the synthesis of a novel polycarbosilane-block-poly(methyl methacrylate) diblock copolymer thr...

2017
Takahiro Sato Rintaro Takahashi

We have formulated the mixing Gibbs energy density for the micelle phase of an amphiphilic block copolymer solution using mean-field lattice theory. We have found a transition between the micellization and the liquid–liquid phase separation in this solution by comparing the mixing Gibbs energy density for the micelle phase with that for the homogeneous phase. Micellization is preferred over the...

Journal: :Chemical communications 2009
Gaojian Chen Sadik Amajjahe Martina H Stenzel

Homopolymer and block copolymer bearing carbohydrate side chain functionality were obtained by grafting glucothiose onto alkene functional scaffolds via a thiol-ene click reaction and the resulting copolymer was used to form thermo-responsive micelles as a potential drug carrier.

2007
Weibin Zha Chang Dae Han Dong Hyun Lee Sung Hyun Han Jin Kon Kim Cheol Park

Three polystyrene-block-poly(2-vinylpyridine) (S2VP diblock) and three polystyrene-block-poly(4-vinylpyridine) (S4VP diblock) copolymers with varying molecular weights and block compositions were synthesized via anionic polymerization, and their order-disorder transition temperatures (TODTs) were determined using oscillatory shear rheometry and small-angle X-ray scattering (SAXS). It has been f...

2017
Sarah L. Canning Thomas J. Neal Steven P. Armes

Polymerization-induced self-assembly (PISA) is used for the highly convenient and efficient preparation of ampholytic diblock copolymer nanoparticles directly in acidic aqueous solution. Cationic nanoparticles comprising a protonated polyamine stabilizer block and a hydrophobic polyacid core-forming block are formed at pH 2. Micelle inversion occurs at pH 10 to produce anionic nanoparticles wit...

2008
Vijay R. Tirumala Vikram Daga August W. Bosse Alvin Romang Jan Ilavsky Eric K. Lin James J. Watkins

The use of short chain block copolymer melts as nanostructured templates with sub-10 nm domains is often limited by their low segregation strength ( N). Since increasing molar mass to strengthen segregation also increases the interdomain spacing of block copolymer melts, it is more desirable to increase the Flory-Huggins segment-segment interaction parameter, , to produce strong segregation. We...

Journal: :Chemical communications 2008
Dechao Niu Yongsheng Li Xiaoli Qiao Liang Li Wenru Zhao Hangrong Chen Qiaoling Zhao Zhi Ma Jianlin Shi

Novel amino- or thiol-functionalized superparamagnetic copolymer-silica nanospheres (NH2-SMCSNs/SH-SMCSNs), which consist of a magnetic core and a silica cross-linked block copolymer shell, have been fabricated.

Journal: :Journal of the American Chemical Society 2014
Carlo Gonzato Mona Semsarilar Elizabeth R Jones Feng Li Gerard J P Krooshof Paul Wyman Oleksandr O Mykhaylyk Remco Tuinier Steven P Armes

Block copolymer self-assembly is normally conducted via post-polymerization processing at high dilution. In the case of block copolymer vesicles (or "polymersomes"), this approach normally leads to relatively broad size distributions, which is problematic for many potential applications. Herein we report the rational synthesis of low-polydispersity diblock copolymer vesicles in concentrated sol...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2010
Jinan Chai Fengwei Huo Zijian Zheng Louise R Giam Wooyoung Shim Chad A Mirkin

Integration of individual nanoparticles into desired spatial arrangements over large areas is a prerequisite for exploiting their unique electrical, optical, and chemical properties. However, positioning single sub-10-nm nanoparticles in a specific location individually on a substrate remains challenging. Herein we have developed a unique approach, termed scanning probe block copolymer lithogra...

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