Most star polymers with controlled molecular weight and low polydispersity are synthesized by living polymerization, in which only initiation and propagation reactions, but not chain transfer reaction, take place. Accordingly, the obtained star polymers are generally not contaminated with linear polymers. Recently, we have developed chain-growth condensation polymerization, a kind of living pol...

A clickable initiator, pentafluoro benzyl bromide, has been investigated for the cationic ring opening polymerization of poly(2-oxazolines).

Well-controlled anionic polymerization of an initiator-functionalized monomer, p-(2,2'-diphenylethyl)styrene (DPES), was achieved for the first time. The polymerization was performed in a mixed solvent of cyclohexane and tetrahydrofuran (THF) at 40 °C with n-BuLi as initiator. When the volume ratio of cyclohexane to THF was 20, the anionic polymerization of DPES showed living polymerization cha...

Besides functional and cross-linking monomers, dental adhesives contain a photo-initiator system for polymerization, thereby providing physico-mechanical strength to the adhesive-tooth interface. Few studies have investigated the effect of the functional monomer and polymerization-initiation system on the polymerization efficiency of the adhesive. Here, we tested the effect of two different fun...

A very small amount of a palladium benzylic complex as initiator brings about the vinylic addition polymerization reluctant 5-vinyl-2-norbornene.

In this work, hydrogel nanocomposites were synthesized by solution polymerization of acrylic acid (AA) and itaconic acid (IA) in the presence of cotton fabric. Ammonium persulfate (APS) was used as the polymerization initiator in the presence of a crosslinker, methylene bisacrylamide (MBA). Insertion of Ag followed by reduction of Ag+ cations results in a hydrogel nanocomposite. The ...

Reaction parameters, such as droplet size, initiator solubility and monomer solubility, which are important in favouring nucleation a miniemulsion thiol–ene step polymerization reviewed.

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...

The highly monodisperse polystyrene (PS) microspheres were produced by dispersion polymerization using an amphoteric initiator, 2,2'-azobis [N-(2-carboxyethyl)-2-2-methylpropionamidine] (VA-057). The polymerization characteristics were investigated and compared with conventional initiators, 2,2-azobis(isobutyronitrile) (AIBN) and benzoyl peroxide (BPO). The monodisperse PS microspheres having t...

Homogeneous DNA polymerase (“reverse transcriptase”) from avian myeloblastosis virus was assayed for exodeoxyribonuclease activity. The substrates were defined template. initiator complexes in which different radioactive nucleotides were present at the 3’-OH termini of the initiator. Even when the number of molecules of enzyme was equal to the number of initiator termini, there was no significa...