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- 저자 : Josemon (검색결과 3 건)
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Design of conjugated materials with side chain azo-linkages
Savita Meena,Josemon Jacob 한국고분자학회 2023 Macromolecular Research Vol.31 No.12
In this paper, we report on the synthesis and characterization of novel conjugated polymers P1–P4 bearing side chain azo-linkages. A diazotization coupling approach was used to design the dibromo functionalized azo-linked target monomers M1–M4 containing one or two azo groups. Monomer 4-((2,5-dibromophenyl)diazenyl)-N,N-dioctylaniline M2 was copolymerized with different donor–acceptor units to obtain polymers P1–P4. Suzuki polymerization reaction was used to synthesize poly[N,N-dioctyl-4-(phenyldiazenyl)aniline-alt-9,9-dioctyl-9H-fluorene] P1 whereas direct arylation polymerization reaction was used to synthesize poly[N,N-dioctyl-4-(phenyldiazenyl)aniline-alt-3-octylthiophene] P2, poly[N,N-dioctyl-4-(phenyldiazenyl)aniline-alt-4,7-bis(4-octylthiophen-2-yl)benzo[c][1,2,5]thiadiazole] P3 and poly[N,N-dioctyl-4-(phenyldiazenyl)aniline-alt-4,4-dioctyl-4H-cyclopenta[1,2-b:5,4-b']dithiophene] P4. Thermogravimetric analyses showed good thermal stability with onset degradation temperatures in the range of 222–338 °C for P1–P4 (T5). All polymers possess good molecular weights with MW ranging from 9.31 to 10.90 kDa. UV–Vis studies on P1–P4 in solution and thin film show their absorption maxima to be between 434 and 517 nm with their optical band gaps falling in the range of 1.94–2.33 eV.
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Lee, Junghoon,Cho, Shinuk,Seo, Jung Hwa,Anant, Piyush,Jacob, Josemon,Yang, Changduk The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.4
<P>A fact-finding study on thiophenyl diketopyrrolopyrrole (<B>TDPP</B>)-containing polymers for electronically convertible transport characteristics in organic field effect transistors (OFETs) is presented. In the subject of this consideration, a <B>TDPP</B>-based polymer with bis-benzothiadiazole (<B>BisBT</B>) units that serve as powerful electron-deficient building blocks, namely <B>PDTDPP–BisBT</B>, is prepared in order to achieve an n-channel transistor. The resulting polymer shows n-channel dominant ambipolar OFET characteristics and its electron mobility (1.3 × 10<SUP>−3</SUP> cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>) is found to be one order of magnitude higher than the hole mobility. Besides, the <B>PDTDPP–BisBT</B> OFET performance is independent of film-deposition conditions due to its completely amorphous microstructure, supported by the atomic force microscopy (AFM) and X-ray diffraction (XRD) analyses. Herein, we report an intriguing discovery in sync with our previous studies that <B>TDPP</B>-based polymers can function as a p-type, n-type, or ambipolar organic semiconductor in accordance with the degree of electron affinity of the comonomers.</P> <P>Graphic Abstract</P><P>Thiophenyl <B>DPP</B>-based polymers can operate on either p-type, n-type, or ambipolar semiconductor subjecting to tune the counterpart comonomers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm14549e'> </P>
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Progress towards stable blue light-emitting polymers
Andrew C. Grimsdale,Jingying Zhang,Klaus M?len,Luke Oldridge,Martin Gaal,Emil J. W. List,Josemon Jacob 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
New routes have been developed for the synthesis of blue-emitting conjugated polymers designed to show stable blue-emission inLEDs. Fluorenes bearing polyphenylene dendrimer side-chains have been made by a new route in which the dendrimer substituentsare built up on a biphenyl which is then ring-closed to give the uorene. This route can be used to make uorenes with a range offunctionalised rst and second generation dendrimer substituents, as monomers for new blue-emitting polymers. Polyindenouo-renes bearing aryl substituents have been made and found to display much stabler blue-emission than previous polyindenouorenes.
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