نتایج جستجو برای: polymerization

تعداد نتایج: 30371  

Journal: :Journal of Polymer Science 1961

Journal: :Angewandte Chemie 2015
Zhongbao Jian Stefan Mecking

The previously unresolved issue of polymerization of allyl monomers CH2 CHCH2 X is overcome by a palladium-catalyzed insertion polymerization of diallyl ether as a monomer. An enhanced 2,1-insertion of diallyl ether as compared to mono-allyl ether retards the formation of an unreactive five-membered cyclic O-chelate (after 1,2-insertion) that otherwise hinders further polymerization, and also ...

1999
Ufuk Yıldız Baki Hazer

The free radical dispersion polymerization of styrene (St) and methyl methacrylate (MMA) initiated by poly(oxyethylene) (PEO) macroazoinimer (MIM-400) in water/ethanol, was investigated at three different temperatures (50, 60 and 80 8C) for seven polymerization times (3, 6, 9, 12, 24, 36 and 48 h). PStPEO and PMMA-PEO networks were obtained. In each case, polymer gel fractions depend on the pol...

2015
Nicolas Massonnet Alexandre Carella Arnaud de Geyer Jérôme Faure-Vincent Jean-Pierre Simonato

The deposition and synthesis of PEDOT:OTf are described in the experimental section. The polymerization parameters were chosen according to previous work from Murphy et al.1–4 The effects of the addition of PEG-PPG-PEG to the solvent have been widely described in their work. The polymerization occurs from temperature as low as 30 °C. However, such low temperatures result in low values of electr...

Journal: :Chemical communications 2014
Kosuke Makiguchi Takuto Yamanaka Toyoji Kakuchi Masahiro Terada Toshifumi Satoh

A high enantiomer-selectivity for the polymerization of rac-lactide was achieved using chiral binaphthol-derived monophosphoric acids as organocatalysts. During the polymerization, d-lactide (DLA) preferentially polymerized via kinetic resolution with the maximum selectivity factor (kD/kL) of 28.3. The selective polymerization of DLA was derived from a dual activation, i.e., monomer activation ...

Journal: :Chemical communications 2011
Itsuko Nakamura Akira Makino Yoshiki Horikawa Junji Sugiyama Masashi Ohmae Shunsaku Kimura

A cross-linked mutant endoglucanase II was prepared for enzymatic polymerization to cellulose. The cross-linked enzyme is composed of three mutant enzymes showing polymerization activity. A characteristic feature of the polymerization with this cross-linked enzyme is formation of cellulose fibrils in contrast to plate-like crystals obtained by using a free enzyme.

Journal: :Dalton transactions 2010
Tanmoy Kumar Saha Bijja Rajashekhar Ravikumar R Gowda Venkatachalam Ramkumara Debashis Chakraborty

Bis(imino)phenoxide complexes of zirconium possess spectacular reactivity towards the solvent-free polymerization of cyclic ester monomers and lactides. Polymerization of lactide is living and the resulting product has exceptionally high number average molecular weights (Mn). Polymerization of β-butyrolactone gives syndiotactic poly(3-hydroxybutyrate) with good Mn and molecular weight distribut...

Journal: :Sen'i Gakkaishi 1984

Journal: :The Journal of the Acoustical Society of America 1960

Journal: :Journal of Synthetic Organic Chemistry, Japan 1967

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