نتایج جستجو برای: direct polycondensation
تعداد نتایج: 425759 فیلتر نتایج به سال:
A new series of blue photoluminescent aromatic polyesters (polyarylates) were synthesized from 1-[N,N-di(4-carboxyphenyl)amino]naphthalene with various bisphenols by the diphenylchlorophosphate (DPCP) activated direct polycondensation in a medium of pyridine and lithium chloride. The synthesis, basic characterizations, photoluminescence and electrochemical properties of this series of novel pol...
polydimethylsiloxane (pdms) has been synthesized by ring-opening polymerization of octamethylcyclotetrasiloxane (d4) in microemulsion with acidic catalyst. the structure and properties of microemulsion were characterized by transmission electron microscopy (tem), fourier transform infrared spectroscopy (ft-ir), photo correlation spectroscopy (pcs). the effect of the variation in ph value, amoun...
Three low-band-gap copolymers based on isoindigo acceptor units were designed and successfully synthesized by direct arylation polycondensation method. Two of them benzodithiophene (BDT)-isoindigo (PBDTI-OD PBDTI-DT) with 2-octlydodecyl (OD) 2-decyltetradecyl (DT) substituted units, respectively. Thiophene donor DT-substituted copolymerized to synthesize PTI-DT. The have a broad absorption rang...
We report a one-pot synthesis of silver nanoparticle-polymer composites (Ag-PNCs) in water by a novel finding involving the polycondensation of methoxybenzyl chlorides (MeO-BzCl) directly on Ag nanoparticle surfaces at room temperature, leading to highly soluble antimicrobial nanocomposites. The composites, which are soluble in a range of organic solvents, precipitate in the reaction vessel, ma...
A direct polycondensation reaction, which is carried out by using phosphorylating agents such as triphenylphosphine as an initiator, was applied to the in-situ formation of various condensation polymers including high temperature polymers within various matrix polymers so that those rigid rod-like polymers were well dispersed within the matrix polymers. Improvements in tensile strength and modu...
Ordered mesoporous carbons (OMCs) have demonstrated great potential in catalysis, and as supercapacitors and adsorbents. Since the introduction of the organic-organic self-assembly approach in 2004/2005 until now, the direct synthesis of OMCs is still limited to the wet processing of phenol-formaldehyde polycondensation, which involves soluble toxic precursors, and acid or alkali catalysts, and...
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