Highly Efficient Incorporation of Functional Groups into Aromatic Main-Chain Polymer Using Iridium-Catalyzed C−H Activation and Suzuki−Miyaura Reaction

2009 ◽  
Vol 131 (5) ◽  
pp. 1656-1657 ◽  
Author(s):  
Tae Soo Jo ◽  
Se Hye Kim ◽  
Jihoon Shin ◽  
Chulsung Bae
Keyword(s):  
Functional Groups ◽  
Main Chain ◽  
Chain Polymer ◽  
Highly Efficient

A general concept for highly efficient covalent laser patterning of graphene based on silver carboxylates

2021 ◽  
Author(s):  
Tao Wei ◽  
Xin Liu ◽  
Sabrin Al-Fogra ◽  
Julien Bachmann ◽  
Frank Hauke ◽  
...  
Keyword(s):  
Functional Groups ◽  
General Concept ◽  
Laser Writing ◽  
Laser Patterning ◽  
Highly Efficient ◽  
Spatially Resolved

Spatially resolved graphene architectures GA, GB, and GC containing different functional groups were efficiently constructed by a novel developed laser-writing concept.

Phase Transitions in Smectic Bent-Core Main-Chain Polymer Networks Detected by Dielectric and Ultrasonic Techniques

2015 ◽  
Vol 479 (1) ◽  
pp. 76-81
Author(s):  
V. Samulionis ◽  
Š. Svirskas ◽  
J. Banys ◽  
A. Sánchez-Ferrer ◽  
N. Gimeno ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Main Chain ◽  
Polymer Networks ◽  
Chain Polymer ◽  
Ultrasonic Techniques

Open-cage silsesquioxane necklace polymers having closed-cage silsesquioxane pendants

2018 ◽  
Vol 9 (30) ◽  
pp. 4108-4112 ◽  
Author(s):  
Hiroaki Imoto ◽  
Ryoichi Katoh ◽  
Kensuke Naka
Keyword(s):  
Optical Properties ◽  
Functional Groups ◽  
Main Chain ◽  
Chain Type

A novel POSS monomer design has been proposed; a closed-cage POSS was tethered to an open-cage POSS, and the remaining two functional groups were employed for polymerization. The thermal and optical properties of the obtained main-chain type POSS polymers can be widely tuned by the substituents at the corners of the POSSs.

scholarly journals Bis-Tridendate Ir(III) Polymer-Metallocomplexes: Hybrid, Main-Chain Polymer Phosphors for Orange–Red Light Emission

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2976
Author(s):  
Konstantinos Andrikopoulos ◽  
Charalampos Anastasopoulos ◽  
Joannis K. Kallitsis ◽  
Aikaterini K. Andreopoulou
Keyword(s):  
Main Chain ◽  
Light Emission ◽  
Red Light ◽  
Molecular Complexes ◽  
Hydroxyl Groups ◽  
Iridium Complexes ◽  
Light Emitters ◽  
Chain Polymer ◽  
Molecular Weights ◽  
Pyridine Moiety

In this work, hybrid polymeric bis-tridentate iridium(III) complexes bearing derivatives of terpyridine (tpy) and 2,6-di(phenyl) pyridine as ligands were successfully synthesized and evaluated as red-light emitters. At first, the synthesis of small molecular bis-tridendate Ir(III) complexes bearing alkoxy-, methyl-, or hydroxy-functionalized terpyridines and a dihydroxyphenyl-pyridine moiety was accomplished. Molecular complexes bearing two polymerizable end-hydroxyl groups and methyl- or alkoxy-decorated terpyridines were copolymerized with difluorodiphenyl-sulphone under high temperature polyetherification conditions. Alternatively, the post-polymerization complexation of the terpyridine-iridium(III) monocomplexes onto the biphenyl-pyridine main chain homopolymer was explored. Both cases afforded solution-processable metallocomplex-polymers possessing the advantages of phosphorescent emitters in addition to high molecular weights and excellent film-forming ability via solution casting. The structural, optical, and electrochemical properties of the monomeric and polymeric heteroleptic iridium complexes were thoroughly investigated. The polymeric metallocomplexes were found to emit in the orange–red region (550–600 nm) with appropriate HOMO and LUMO levels to be used in conjunction with blue-emitting hosts. By varying the metal loading on the polymeric backbone, the emitter’s specific emission maxima could be successfully tuned.

Pyrolysis behaviors of organic matter (OM) with the same alkyl main chain but different functional groups in the presence of clay minerals

2018 ◽  
Vol 153 ◽  
pp. 205-216 ◽  
Author(s):  
Hongmei Liu ◽  
Peng Yuan ◽  
Dong Liu ◽  
Hongling Bu ◽  
Hongzhe Song ◽  
...  
Keyword(s):  
Organic Matter ◽  
Clay Minerals ◽  
Functional Groups ◽  
Main Chain

The formation of a liquid crystalline main chain polymer by means of photopolymerization

1998 ◽  
Vol 24 (3) ◽  
pp. 375-379 ◽  
Author(s):  
J. LUB ◽  
D. J. BROER ◽  
M. E. MARTINEZ ANTONIO ◽  
G. N. MOL
Keyword(s):  
Liquid Crystalline ◽  
Main Chain ◽  
Chain Polymer

Network Scission Processes in Peroxide Cured Methylvinyl Silicone Rubber

1967 ◽  
Vol 40 (2) ◽  
pp. 629-634
Author(s):  
D. K. Thomas
Keyword(s):  
Silicone Rubber ◽  
Elevated Temperatures ◽  
Main Chain ◽  
Methyl Groups ◽  
Chain Polymer ◽  
Filled Rubber ◽  
Oxidative Reactions ◽  
Silica Filler ◽  
Silicone Rubbers ◽  
Hydrolysis Of

Abstract In what appeared to be a complex system it transpires that network scission in methylvinyl silicone rubbers at temperatures below 250° C is due largely to hydrolytic reactions in the main chain polymer. At temperatures of 250° C and above there are indications that a significant amount of scission arises from oxidative reactions in the crosslinks, and that this reaction is catalyzed by acidic residues in the rubber. There is no indication that acidic byproducts of the vulcanization reaction catalyze the hydrolysis of siloxane bonds in the polymer. In conventional heat aging tests in which the rubber remains in an unstrained condition the effects of hydrolysis will only be observed if the concentration of water in the system is allowed to rise. Under these circumstances softening will occur because of a shift in the position of equilibrium in the reaction ∼Si—O—Si—O∼ + H2O→∼Si—OH+ HO—Si—O∼ On aging the material in a well ventilated situation the effects of hydrolysis are not seen and the silicone rubber becomes brittle after long exposure at high temperature. This embrittlement must result from additional crosslinking caused by oxidative reactions in the methyl groups of the main chain polymer. When the rubber is used in compression or tension, hydrolytic scission will affect performance, and in applications of this sort it is important to dry the rubber before use and prevent access of moisture to the component during use. With filled rubber the silica filler is a further source of moisture and drying needs to be carried out at elevated temperatures immediately before use. In order to improve the confined heat aging performance of silicone rubber an alternative filler to fine silica is needed which does not have the same affinity for water. It may be, however, that ability to reinforce silicone rubber and affinity for water are inseparable.

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