نتایج جستجو برای: direct polycondensation

تعداد نتایج: 425759  

Journal: :Kondensirovannye sredy i mežfaznye granicy 2022

The removal of low molecular weight products the reaction and heat withdrawal is one problems bulk polycondensation. Polycondensation under spray conditions an effective way to solve these problems. Based on example reversible lactic acid polycondensation, it was shown that size effects can significantly affect conversion rate, degree polymerization, rate processes. Chemical thermodynamics sugg...

Journal: :Chemical communications 2009
S Kyle Sontag Nicholas Marshall Jason Locklin

Electroactive conjugated polymer brushes of poly(thiophene) and poly(phenylene) have been prepared via a surface-initiated Kumada-type polycondensation reaction, yielding films with a thickness up to 42 nm.

Journal: :Chemical communications 2006
Jiebin Pang Lu Yang Douglas A Loy Huisheng Peng Henry S Ashbaugh Joel Mague C Jeffrey Brinker Yunfeng Lu

Long-range molecularly ordered organosilica and carbon-silica hybrids with uniform morphology have been synthesized by surfactant-assisted hydrolysis and self-assembly of biphenyl bridged organosilane, followed by thermal polycondensation and carbonization.

Journal: :Chemical communications 2011
Samir El Hankari Blanca Motos-Pérez Peter Hesemann Ahmed Bouhaouss Joël J E Moreau

Mesoporous hybrid silica bearing zwitterionic species were synthesized via template-directed hydrolysis-polycondensation reactions from zwitterionic ammonium sulfonate precursors. The formation of the nanostructured phases involves specific precursor-template interactions. The obtained materials are efficient heterogeneous catalysts in Biginelli reactions.

Two new samples of poly(amide-imide)/nanocomposites containing bicyclo segment and dibenzalaceton moiety in the main chain were synthesized by a solution intercalation technique. Poly(amide-imide) (PAI) 8 as a source of polymer matrix was synthesized by the direct polycondensation reaction of N,N´-bis(4-carboxyphenyl)bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic diimide 3 with 2,6-bis(4-amino...

Journal: :Chemical communications 2010
Norihiro Mizoshita Ken-Ichi Yamanaka Toyoshi Shimada Takao Tani Shinji Inagaki

Polycondensation of 9-mesityl-10-methylacridinium-bridged organosilane in the presence of a nonionic surfactant yielded a mesostructured organosilica solid with a functional framework that exhibited long-lived photoinduced charge separation.

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