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Volumn 41, Issue 3, 2008, Pages 741-750

Alternating block copolymers consisting of oligo(phenylene) and oligo(ethylene glycol) units of defined length: Synthesis, thermal characterization, and light-emitting properties

Author keywords

[No Author keywords available]

Indexed keywords

ALTERNATING BLOCK COPOLYMERS; SUZUKI COUPLING PROTOCOL; TERPHENYL POLYMERS; THERMAL CHARACTERIZATION;

EID: 39749171885     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma070796n     Document Type: Article
Times cited : (38)

References (68)
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    • While parent poly(p-phenylene) is not planar, the measured dihedral angle is only about 20° in the solid state (Sasaki, S, Yamamoto, T, Kanbara, T, Monta, A, Yamamoto, T. J. Polym. Sci, Polym. Phys. Ed. 1992, 30, 293-297, allowing for significant conjugation between the rings. Alkyl substituents increase this angle, causing a disruption in the conjugation. For example, Grem and Leising have shown that the band gap of poly(p-phenylene) copolymers can be increased with the periodic incorporation of side chains onto the backbone.10
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    • For a rigid-flexible alternating block copolymer based on a poly(pphenylene ethynylene) derivative, see: Dellsperger, S.; Dötz, F.; Smith, P.; Weder, C. Macromol. Chem. Phys. 2000, 201, 192-198.
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    • For a rigid-flexible alternating block copolymer based on an oligo(p-phenylene vinylene) derivative, see: Zheng, M.; Ding, L.; Gürel, E.; Lahti, P. M.; Karasz, F. E. Macromolecules 2001, 24, 4124-4129.
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    • For a recent alternating block copolymer with conjugated poly(thiophene) blocks, see: Tu, G.; Li, H.; Forster, M.; Heiderhoff, R.; Balk, L. B.; Scherf, U. Macromolecules 2006, 39, 4327-4331.
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    • For a recent example with typical molecular weights, see: Zhou, X.H.; Niu, Y.-H.; Huang, F.; Liu, M. S.; Jen, A. K.-Y. Macromolecules 2007, 40, 3015-3020.
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    • High molecular weights for light-emitting polymers can be achieved with a Suzuki polycondensation. For example, see: Yan, H.; Lee, P.; Armstrong, N. R.; Graham, A.; Evmenenko, G. A.; Dutta, P.; Marks, T. J. J. Am. Chem. Soc. 2005, 127, 3172-3183. However, this is an exception rather than the norm.
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    • Hyperbranched, light-emitting polymers can be formed with very high molecular weights. For example, see: Sun, M.; Li, J.; Li, B.; Fu, Y.; Bo, Z. Macromolecules 2005, 38, 2651-2658.
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    • Higher molecular weights can often be obtained with a Yamamoto, coupling polymerization. For example, see: Yang, C.; Scheiber, H.; List, E. J. W.; Jacob, J.; Müllen, K. Macromolecules 2006, 39, 5213-5221.
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    • For a recent example in which polymorphism was investigated in a similar manner, see: Ghosh, A. K.; Woo, E. M.; Sun, Y.-S.; Lee, L.-T.; Wu, M.-C. Macromolecules 2005, 38, 4780-4790.
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    • 52 However, these measurements were performed in cyclohexane. Chloroform has a pronounced 35% quenching effect on the fluorescence of terphenyl: Cohen, S. G.; Weinreb, A. Phys. Rev. 1954, 93, 1117. The quantum yields for these standards in chloroform were obtained by measuring the fluorescence and UVabsorbance in both solvents and correcting for refractive index, as described in ref 68.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.