نتایج جستجو برای: redox initiators

تعداد نتایج: 41274  

A. Fathi M. Abbasian M. Jaymand M. Z. Ghadami

Exfoliated poly (Chloromethyl styrene-co-styrene)-g-polyacrylonitryle/organo- modified montmorillonite [P(CMSt-co-St)-g-PAN/O-MMT] nanocomposite was synthesized through solution intercalation method by using atom transfer and nitroxide mediated radical polymerization. At first, poly (chloromethyl styrene-costyrene) copolymer was synthesized by nitroxide - mediated “living” free radical polyme...

2014
Xueyan Zhou Jing Yang Zehong Lin Jianpei Zhang

Finding the true source of a social network is a crucial component of social network information tracing. Using the new media microblog as an example, this paper provides a source tracing algorithm ITEPE (Initiators and Early Participants Extraction) to solve this problem. First, the cascade (session tree) is built according to the retweeting of a microblog, after which the cascade set (session...

Journal: :JECO 2014
Mu-Li Yang

This study examines online group-buying from the perspectives of organizational culture and transformational leadership. A convenience sampling of 400 online group-buying individuals living in Taiwan was conducted in 2011, and this yielded 300 effective questionnaires, giving a return rate of 75%. ANOVA analyses and canonical correlation were used to examine the participants’ perceptions of org...

Journal: :Journal of Polymer Science Part A: Polymer Chemistry 2006

2017
Linping Qian Zhen Wang Evgeny V Beletskiy Jingyue Liu Haroldo J Dos Santos Tiehu Li Maria do C Rangel Mayfair C Kung Harold H Kung

The ability of Au catalysts to effect the challenging task of utilizing molecular oxygen for the selective epoxidation of cyclooctene is fascinating. Although supported nanometre-size Au particles are poorly active, here we show that solubilized atomic Au clusters, present in ng ml-1 concentrations and stabilized by ligands derived from the oxidized hydrocarbon products, are active. They can be...

2013
Clare Bakewell Andrew J. P. White Nicholas J. Long Charlotte K. Williams

The synthesis and characterization of a series of 8-quinolinolato gallium complexes is presented, and the complexes are analogous to a series of aluminum complexes previously reported. The complexes have been shown to be active initiators for the ring-opening polymerization of rac-lactide. High degrees of polymerization control are demonstrated, as exemplified by the linear evolution of molecul...

2013
Akhilesh Kumar Shakya Ashok Kumar

Article info: Received: 23 January 2013 Accepted: 5 February 2013 ABSTRACT One of the major challenges in modern synthetic polymer chemistry is to synthesize end defined polymers of different end functionality with predetermined uniform molecular weight. End functionalized polymers/copolymers basically in block and grafting form are having several potential applications in biomedical areas in t...

Journal: :Journal of the American Chemical Society 2008
Nicholas C Strandwitz Anzar Khan Shannon W Boettcher Alexander A Mikhailovsky Craig J Hawker Thuc-Quyen Nguyen Galen D Stucky

The development of one- and two-photon induced polymerization using CdS semiconductor quantum dots (QDs) and amine co-initiators to promote radical generation and subsequent polymerization is presented. Two-photon absorption (TPA) cross-section measurements, linear absorption, and transmission electron microscopy are used to characterize the QDs. The effectiveness of the co-initiators in increa...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2011
Sameh Tawfick Michael De Volder A John Hart

We demonstrate the fabrication of horizontally aligned carbon nanotube (HA-CNT) networks by spatially programmable folding, which is induced by self-directed liquid infiltration of vertical CNTs. Folding is caused by a capillary buckling instability and is predicted by the elastocapillary buckling height, which scales with the wall thickness as t(3/2). The folding direction is controlled by inc...

2017
Sharon Kingston Maya Rose Julian Cohen-Serrins Emily Knight

Individuals who initiate substance use before high school are at higher risk of negative outcomes. Eighty-six young adults between the ages of 18 and 28 participated in semi-structured qualitative interviews focused on the circumstances surrounding participants' first use of substances and their pattern of use in the year following initiation in order to investigate similarities and differences...

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