نتایج جستجو برای: n vinylimidazole
تعداد نتایج: 976532 فیلتر نتایج به سال:
Poly(N-vinyl imidazole) (PVI) has been grafted onto carboxymethyl starch (CMS) in aqueous solution using potassium persulfate (KPS) as initiator. Reaction parameters that affect grafting efficiency and percentage grafting such as monomer and initiator concentration, the reaction temperature and time were investigated. The grafted products were characterized by FTIR, thermal analysis, SEM photog...
The synthesis of a heterocyclic mesomeric betaine by quaternization reaction of 1-butylimidazole and tetrabromo-1,4-benzoquinone is presented. The structure was verified by means of X-ray single-crystal analysis, NMR and IR spectroscopy. Inclusion complexes of the heterocyclic mesomeric betaine with randomly methylated (1.8) β-cyclodextrin were investigated by UV-vis spectroscopy. Furthermore, ...
Поли-N-винилкапролактам (ПВКЛ), синтезированный полимеризацией с обратимой передачей цепи по механизму присоединения–фрагментации применением ксантатов для макромолекулярного дизайна, подвергается деполимеризации при нагревании в присутствии низкомолекулярного агента передачи - [1-(О-этилксантил)этил]бензола. Показано, что после активность 1-(O-этилксантил)этильных групп сохраняется и полимериз...
This communication presents the pH-dependent chelation of Zn(2+) ions with the imidazole groups of poly(1-vinylimidazole) (PVIm) and DNA polyion complex formation with the zinc-chelated PVIm (PVIm-Zn) via chelated Zn(2+) ions. The resulting PVIm-Zn/DNA complexes exhibit no significant cytotoxicity and show outstanding gene expression.
INTRODUCTION In recent years, studies of the reaction rates of small molecules in the presence of synthetic polymers containing catalytically active functions have contributed significantly to the understanding of the mechanism of enzyme behaviour1. Of particular interest in the field of polymeric catalysis have been the studies of the solvolyses of esters catalyzed by polymers containing pende...
In this study, water-soluble silicon quantum dots have quasi-blue emission at 390 nm by being capped with 1-vinylimidazole in resese micelles. As-obtained silicon quantum dots have a diameter of 2~5 nm and high crystallinity. The quasi-blue emission of the silicon quantum dots is likely attributed to the polarity of the capping ligands. Moreover, the silicon quantum dots are water-soluble and h...
Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and acetylenic esters, by NH-acids such as azathioprine, imidazole or theophylline leads to the formation of vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce phosphorus ylides. Silica nanoparticles (silica NPs were prepared by therm...
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