نتایج جستجو برای: setereoselective polymerization

تعداد نتایج: 30371  

Journal: :Polimery 2023

Polymerization conditions in the Pickering emulsion of colloidal silica-stabilized polystyrene latex were optimized. The influence process on various parameters, including particle size and distribution was investigated. Monomodal particles obtained by conducting at a temperature 80°C slightly acidic environment (pH = 5), while maintaining fast monomer conversion. It has been shown that amount ...

Journal: :The Journal of the Society of Chemical Industry, Japan 1966

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
f. ameri dept. of color physics, institute for color science and technology, tehran, iran. m. abdo tabrizi dept. of restorative dentistry, school of dentistry, shahid beheshti university of medical sciences, tehran, iran. a. ghassemi dept. of restorative dentistry, dental research center, school of dentistry, shahid beheshti university of medical sciences, tehran, iran. a. najafi dept. of restorative dentistry, school of dentistry, shahid beheshti university of medical sciences, tehran, iran. a. nakhostin dept. of restorative dentistry, school of dentistry, arak university of medical sciences, arak, iran. h. norouzi dept. of restorative dentistry, school of dentistry, shahid beheshti university of medical sciences, tehran, iran.

objective: bulk-fill composites are a group of composite resins designed for easy and fast filling of large cavities. this study aimed to assess the color stability of bulk-fill composites subjected to xenon radiation and evaluate their color change (&deltae;) following polymerization. methods: in this in vitro experimental study, 30 specimens (4mm in height and 8mm in diameter) were fabricated...

Journal: :Molecules 2005
Yuushou Nakayama Takeshi Shiono

This review article describes developments in chiral metallocenes as polymerization catalysts focusing on C2 symmetric ansa-zirconocene complexes. Selective synthesis of rac-isomers of ansa-zirconocenes are surveyed. Isospecific polymerizations of propylene catalyzed by chiral zirconocenes are summarized. Advanced series of polymerizations by chiral metallocenes such as asymmetric polymerizatio...

Journal: :Chemical communications 2012
Cuiling Xu Insun Yu Parisa Mehrkhodavandi

An ethoxy-bridged dinuclear indium catalyst was used for the ring opening polymerization of the cyclic ester β-butyrolactone to form the biodegradable polyester poly(hydroxybutyrate) (PHB). The catalyst shows remarkable activity and control during polymerization, allowing for formation of diblock polymers. Addition of high ratios of alcohols to the catalyst leads to fast chain transfer and immo...

2009
Durairaj Baskaran Axel H.E. Müller

The concept of anionic polymerization was first developed by Ziegler and Schlenk in early 1910. Their pioneering work on the polymerization of diene initiated with sodium metal set the stage for the use of alkali metal containing aromatic hydrocarbon complexes as initiators for various α-olefins. In 1939, Scott and coworkers used for the first time the alkali metal complexes of aromatic hydroca...

Journal: :Appl. Math. Lett. 2002
Daniel A. Schult Cyndi A. Spade Vladimir A. Volpert

we develop and study a mathematical model which describes how an inert species contained in the initial monomer/initiator mixture is redistributed by a propagating polymerization front. This study is relevant to the production of polymers for optical applications. @ 2002 Elsevier Science Ltd. All rights reserved. Keywords--Free radical polymerization, Frontal polymerization, Mathematical modeli...

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