نتایج جستجو برای: atrp
تعداد نتایج: 663 فیلتر نتایج به سال:
Replication blocks and DNA damage incurred during S phase activate the S-phase and intra-S-phase checkpoint responses, respectively, regulated by the Atrp and Chk1p checkpoint kinases in metazoans. In Saccharomyces cerevisiae, these checkpoints are regulated by the Atrp homologue Mec1p and the kinase Rad53p. A conserved role of these checkpoints is to block mitotic progression until DNA replica...
Poly(dimethyl siloxane) (PDMS)-based materials with improved photoactuation properties were prepared by the incorporation of polymer-grafted graphene oxide particles. The modification of the graphene oxide (GO) surface was achieved via a surface initiated atom transfer radical polymerization (SI ATRP) of methyl methacrylate and butyl methacrylate. The modification was confirmed by thermogravime...
Design and use of organic nanoparticles prepared from star-shaped polymers with reactive end groups.
Star-shaped poly(isobornyl acrylate) (PiBA) was prepared by atom transfer radical polymerization (ATRP) using multifunctional initiators. The optimal ATRP conditions were determined to minimize star-star coupling and to preserve high end group functionality (>90%). Star-shaped PiBA with a narrow polydispersity index was synthesized with 4, 6, and 12 arms and of varying molecular weight (10,000 ...
The use of hydrogel nanostructured patterns and films in biomedical micro- and nanodevices requires the ability to analyze and understand their response properties at the nanoscale. Herein, the thermoresponse behavior of atom transfer radical polymerization (ATRP) grown poly(ethylene glycol) n dimethacrylate (PEGnDMA) cross-linked poly(N-isopropyl acrylamide) (PNIPAAm) hydrogel thin films over ...
A series of fluorine-containing amphiphilic graft copolymers consisting of a semi-fluorinated poly(2methyl-1,4-bistrifluorovinyloxybenzene) (PMBTFVB) backbone and hydrophilic poly(acrylic acid) (PAA) side chains was synthesized by the combination of thermal cycloaddition polymerization and atom transfer radical polymerization (ATRP) through the grafting-from strategy. 2-Methyl-1,4-bistrifluorov...
The fabrication of freestanding, sub-100 nm-thick, pH-responsive hydrogel membranes with controlled nano-morphology, based on modified poly(hydroxyethyl methacrylate) (PHEMA) is presented. Polymer hydrogel-brush films were first synthesized by surface-initiated atom transfer radical polymerization (SI-ATRP) and subsequently detached from silicon substrates by UV-induced photo-cleavage of a spec...
Front Cover: A block copolymer containing UV-addressable benzophenone moieties within the hydrophobic is synthesized via atom transfer radical polymerization (ATRP). The utilized in a self-assembly non-solvent induced phase separation process to obtain an integral asymmetric membrane, which can be stabilized upon UV- irradiation revealing enhanced solvent and pressure resistance. This work feat...
پلیمرشدن رادیکالی انتقال اتم (atrp) استیرن در مجاورت نانوذرات میان متخلخل سیلیکا و در دمای ۱۱۰ درجه سلسیوس انجام شد. روش های آغاز معکوس (ratrp) و نرمال و معکوس هم زمان (sr&ni atrp) به عنوان دو روش مناسب برای غلبه بر مشکلات اکسایش به کار گرفته شدند. ویژگی عمده در این دو روش آغاز، استفاده از کاتالیزورهای فلزی در حالت اکسایش بیشتر آنهاست که در این شرایط بر مشکلات مربوط به روش آغاز نرمال غلبه...
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