نتایج جستجو برای: diblock copolymer

تعداد نتایج: 12909  

Journal: :Collection of Czechoslovak Chemical Communications 2022

The cover feature image shows three-stream flows generated in microflow channels, which provide versatile reaction fields for automated supramolecular polymerization, realizing multiple operations: the injection of monomers, selective reactions, recovery and purification polymers. occurred selectively at forward-facing terminus polymer, leading to a high-purity diblock copolymer. More informati...

2013
Chung Ping Leon Wan Kevin Letchford John K Jackson Helen M Burt

Two types of nanoparticles were prepared using the diblock copolymer methoxy poly(ethylene glycol)-block-poly(caprolactone) (MePEG-b-PCL), with either a short PCL block length, which forms micelles, or with a longer PCL block length, which forms kinetically "frozen core" structures termed nanospheres. Paclitaxel (PTX)-loaded micelles and nanospheres were evaluated for their cytotoxicity, cellul...

Journal: :Biomacromolecules 2012
Carla S Thomas Liza Xu Bradley D Olsen

Aqueous processing of globular protein-polymer diblock copolymers into solid-state materials and subsequent solvent annealing enables kinetic and thermodynamic control of nanostructure formation to produce block copolymer morphologies that maintain a high degree of protein fold and function. When model diblock copolymers composed of mCherry-b-poly(N-isopropylacrylamide) are used, orthogonal con...

Journal: :Chemical communications 2009
Guillaume Delaittre Charlotte Dire Jutta Rieger Jean-Luc Putaux Bernadette Charleux

Polymerization-induced formation of amphiphilic diblock copolymer vesicles is performed in water at high concentrations by a single-step nitroxide-mediated controlled free-radical emulsion polymerization of 4-vinylpyridine, initiated by a water-soluble poly(sodium acrylate) macroalkoxyamine at alkaline pH.

Journal: :Journal of the American Chemical Society 2004
Rong-Ming Ho Yeo-Wan Chiang Chi-Chun Tsai Chu-Chieh Lin Bao-Tsan Ko Bor-Han Huang

Chirality-driven microphase-separated morphology, poly(l-lactide) (PLLA) left-handed nanohelices hexagonally packed in PS matrix, was obtained from chiral diblock copolymers, poly(styrene)-b-poly(l-lactide). This is perhaps for the first time; the helical superstructures of chiral block copolymers were generated in the bulk and self-assembled to a two-dimensionally (2D) packed lattice. Now, the...

Journal: :Physical review letters 2008
Zuojun Guo Guojie Zhang Feng Qiu Hongdong Zhang Yuliang Yang An-Chang Shi

A generic Fourier-space approach to solve the self-consistent field theory of block copolymers is developed. This approach is based on the fact that, for any computational box with periodic boundary conditions, all spatially varying functions are spanned by the Fourier series determined by the size and shape of the box. The method reproduces all known diblock copolymer phases. The application o...

Journal: :Journal of the American Chemical Society 2005
Chuanbing Tang Adam Tracz Michal Kruk Rui Zhang Detlef-M Smilgies Krzysztof Matyjaszewski Tomasz Kowalewski

Large-scale alignment of lamellae in thin films of diblock copolymers containing polyacrylonitrile and poly(n-butyl acrylate) was achieved by casting copolymer solution on a silicon substrate moved away at a constant speed from the casting nozzle (zone-casting). Grazing incidence small-angle X-ray scattering revealed that the lamellae, which were perpendicular to the substrate, were also aligne...

Journal: :Journal of controlled release : official journal of the Controlled Release Society 2005
Louisa Ould-Ouali Marc Noppe Xavier Langlois Bart Willems Paula Te Riele Philip Timmerman Marcus E Brewster Albertina Ariën Véronique Préat

Diblock PEG-p(CL-co-TMC) [methoxypoly(ethylene glycol)-poly(caprolactone/trimethylene carbonate)] copolymers form micelles spontaneously and significantly increase the solubility of poorly water-soluble drugs. The aim of this work was to assess these diblock copolymers as oral drug delivery systems in both in vitro and in vivo experiments using risperidone as a model drug. The permeation of ris...

Journal: :Macromolecules 2012
Bokyung Kim Christopher N Lam Bradley D Olsen

The use of ionic interactions to direct both protein templating and block copolymer self-assembly into nanopatterned films with only aqueous processing conditions is demonstrated using block copolymers containing both thermally responsive and pH responsive blocks. Controlled reversible addition-fragmentation chain-transfer (RAFT) polymerization is employed to synthesize poly(N-isopropylacrylami...

Journal: :Soft matter 2014
Shiying Ma Dongliang Qi Mengying Xiao Rong Wang

We performed a dissipative particle dynamics (DPD) approach to study the self-assembly of AB diblock copolymer tethered nanoparticles (P) in dilute solutions. Different morphological aggregates, including spherical micelles, vesicles, disk-like micelles and rod-like micelles, were found by varying the interaction between block copolymers and nanoparticles. Most importantly, the nanoparticles ca...

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