Iterative step-growth synthesis and degradation of unimolecular polyviologens under mild conditions

2022 ◽  
Author(s):  
Abigail Delawder ◽  
Mark S. Palmquist ◽  
Jovelt M. Dorsainvil ◽  
Nathan D. Colley ◽  
Tiana M. Saak ◽  
...  
Keyword(s):  
Main Chain ◽  
Addition Method ◽  
Mild Conditions ◽  
Step Growth ◽  
Synthesis And Degradation

An iterative step-growth addition method was used to expedite the gram-scale synthesis of main-chain polyviologens by several days, while also producing the longest main-chain polyviologen (i.e., 26 viologen subunits) reported...

Synthesis and Incorporation of Thienylene Vinylene Oligomers in Main-Chain Copolymers

1997 ◽  
Vol 488 ◽  
Author(s):  
L. G. Madrigal ◽  
E. H. Elandaloussi ◽  
C. W. Spangler
Keyword(s):  
Main Chain ◽  
Radical Cations ◽  
Synthetic Approach ◽  
Chemical Doping ◽  
Third Order ◽  
The Past ◽  
Growth Reaction ◽  
Oxidative Doping ◽  
Step Growth ◽  
Conductivity Behavior

AbstractPoly [2,5-thienylene vinylene] (PTV) has been studied extensively over the past decade for both its metallic conductivity behavior upon chemical doping, as well as its interesting third order nonlinear optical properties. PTV oligomers have been synthesized by our group 1, as well as others 2, and the formation of polaron-like radical-cations or bipolaron-like dications by oxidative doping has been demonstrated. In this paper we describe a general synthetic approach to PTV oligomers functionalized for copolymer formation by step-growth reaction.

Main-chain PPEGMEMA-b-PBTFVPP-b-PPEGMEMA perfluorocyclobutyl aryl ether-based amphiphilic ABA triblock copolymer: synthesis and self-assembly

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77388-77398 ◽  
Author(s):  
Chun Feng ◽  
Wenqiang Yao ◽  
Guolin Lu ◽  
Yongjun Li ◽  
Xiaoyu Huang
Keyword(s):  
Self Assembly ◽  
Triblock Copolymer ◽  
Main Chain ◽  
Triblock Copolymers ◽  
Aryl Ether ◽  
Step Growth ◽  
Aba Triblock Copolymer ◽  
Transformation Strategy

A novel perfluorocyclobutyl aryl ether-based amphiphilic ABA triblock copolymers were synthesized via the site transformation strategy using sequential thermal [2π + 2π] step-growth cycloaddition polymerization and ATRP.

scholarly journals Sterically hindered malonamide monomers for the step growth synthesis of polyesters and polyamides

2014 ◽  
Vol 50 (73) ◽  
pp. 10665-10668 ◽  
Author(s):  
S. N. G. Tyler ◽  
R. L. Webster
Keyword(s):  
Molecular Weight ◽  
Lewis Acid ◽  
Mild Conditions ◽  
Step Growth ◽  
Sterically Hindered

Exploiting the ready cleavage of bulky amides in the presence of a simple nucleophile, a new monomer for step growth polymerisation has been realised. A range of novel polyesters and polyamides have been prepared under mild conditions that allow for efficient recycling and reuse of the amine by-product. The use of a Lewis acid to increase polyester molecular weight is also explored.

Main-Chain Ferrocene-Containing Polymers Prepared by Acyclic Diene Metathesis Polymerization: A Review

2020 ◽  
Vol 24 (9) ◽  
pp. 1010-1017 ◽  
Author(s):  
Ye Sha ◽  
Zhihua Shen ◽  
Huan Jia ◽  
Zhenyang Luo
Keyword(s):  
Main Chain ◽  
Functional Unit ◽  
Polymeric Materials ◽  
Acyclic Diene Metathesis ◽  
Polymer Backbone ◽  
Design Synthesis ◽  
Admet Polymerization ◽  
Mild Conditions ◽  
Diene Metathesis ◽  
Iron Center

Ferrocene, the crown of metallocene family, is widely studied as a functional unit in electrochemical and catalytic applications due to its sandwich structure. Ferrocene moieties can be embedded into the polymer backbone, leading to main-chain ferrocenecontaining polymers. These polymeric materials combine the unique functionalities of iron center with the processabilities of polymers. As one of the choice polymerization techniques, acyclic diene metathesis (ADMET) polymerization serves as a versatile method to prepare main-chain ferrocene-containing polymers under mild conditions using α,ω-dienes as monomers. This paper overviews main-chain ferrocene-containing polymers prepared by ADMET polymerization. Advances in the design, synthesis and applications of this class of organometallic monomers and polymers are detailed.

Synthesis and crosslinking behavior of a novel linear polymer bearing 1,2,3-triazol and benzoxazine groups in the main chain by a step-growth click-coupling reaction

2008 ◽  
Vol 46 (7) ◽  
pp. 2316-2325 ◽  
Author(s):  
Atsushi Nagai ◽  
Yasutaka Kamei ◽  
Xiao-Shui Wang ◽  
Masaki Omura ◽  
Atsushi Sudo ◽  
...  
Keyword(s):  
Main Chain ◽  
Coupling Reaction ◽  
Linear Polymer ◽  
Step Growth ◽  
Polymer Bearing ◽  
Click Coupling

Preparation and characterization of novel main-chain azobenzene polymers via step-growth polymerization based on click chemistry

Polymer ◽  
2009 ◽  
Vol 50 (19) ◽  
pp. 4512-4519 ◽  
Author(s):  
Xiaoqiang Xue ◽  
Jian Zhu ◽  
Wei Zhang ◽  
Zhengbiao Zhang ◽  
Xiulin Zhu
Keyword(s):  
Click Chemistry ◽  
Main Chain ◽  
Step Growth ◽  
Step Growth Polymerization

Anisotropy of interfacial defects in the initial stage of MOVPE GaAs growth On Si

1990 ◽  
Vol 48 (4) ◽  
pp. 592-593
Author(s):  
C. Vannuffel ◽  
C. Schiller ◽  
J. P. Chevalier
Keyword(s):  
Early Stage ◽  
Threading Dislocations ◽  
Mbe Growth ◽  
Detailed Mechanism ◽  
Si Substrates ◽  
Initial Stage ◽  
Interfacial Defects ◽  
Interfacial Dislocations ◽  
Step Growth ◽  
Essential Problem

Recently, interest has focused on the epitaxy of GaAs on Si as a promising material for electronic applications, potentially for integration of optoelectronic devices on silicon wafers. The essential problem concerns the 4% misfit between the two materials, and this must be accommodated by a network of interfacial dislocations with the lowest number of threading dislocations. It is thus important to understand the detailed mechanism of the formation of this network, in order to eventually reduce the dislocation density at the top of the layers.MOVPE growth is carried out on slightly misoriented, (3.5°) from (001) towards , Si substrates. Here we report on the effect of this misorientation on the interfacial defects, at a very early stage of growth. Only the first stage, of the well-known two step growth process, is thus considered. Previously, we showed that full substrate coverage occured for GaAs thicknesses of 5 nm in contrast to MBE growth, where substantially greater thicknesses are required.

Study of Sentiment of Governor's Election Opinion in 2018

2018 ◽  
pp. 231-238
Author(s):  
Agung Eddy Suryo Saputro ◽  
Khairil Anwar Notodiputro ◽  
Indahwati A
Keyword(s):  
Sentiment Analysis ◽  
Naive Bayes ◽  
Naïve Bayes ◽  
Addition Method ◽  
Sentiment Mining ◽  
Positive Sentiment ◽  
Trending Topics ◽  
Election News

In 2018, Indonesia implemented a Governor's Election which included 17 provinces. For several months before the Election, news and opinions regarding the Governor's Election were often trending topics on Twitter. This study aims to describe the results of sentiment mining and determine the best method for predicting sentiment classes. Sentiment mining is based on Lexicon. While the methods used for sentiment analysis are Naive Bayes and C5.0. The results showed that the percentage of positive sentiment in 17 provinces was greater than the negative and neutral sentiments. In addition, method C5.0 produces a better prediction than Naive Bayes.

Sign in / Sign up

Export Citation Format

Share Document