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Gelation Behavior of poly(9,9-dioctylfluorene)/poly[9,9-di(2-ethylhexyl)-fluorenyl-2,7-diyl] Blend in Methylcyclohexane Solutions

Gelation Behavior of poly(9,9-dioctylfluorene)/poly[9,9-di(2-ethylhexyl)-fluorenyl-2,7-diyl] Blend in Methylcyclohexane Solutions

Jean-Hong Chen, Ching-Iuan Su, Hsin-Lung Chen, Chih-Shun Chang, Yu-Chun Chang, Lung-Chuan Chen, Show-An Chen

Langmuir. 2012 Dec 18;28(50):17457-64.

PMID: 23181822

Abstract:

We investigated the gelation behavior of the blend of two light-emitting polyfluorenes, i.e., poly(9,9-dioctylfluorene-2,7-diyl) (PF(8)) and poly[9,9-di(2-ethylhexyl)-fluorenyl-2,7-diyl] (PF(2/6)), in solutions with methylcyclohexane (MCH). Upon prolonged aging at room temperature, dynamic light scattering revealed that phase separation in the initially well-mixed solutions occurred via spinodal decomposition, yielding a PF(8)/PF(2/6)-enriched phase and an isotropic solvent-rich phase. Sheetlike aggregates in which a portion of the PF(8) chains adopted the β conformation were formed in the polymer-enriched phase, as revealed by small-angle X-ray scattering and optical spectroscopy. Macroscopically, the phase separation transformed the original viscous liquid solution into a gel. Measurements of the gelation temperature (T(gel)), gel-to-sol transition temperature (T(g-s)), and spinodal decomposition temperature (T(SD)) indicated that gelation (and hence phase separation) became more difficult with increasing content of PF(2/6). The presence of PF(2/6) also hindered formation of the β-phase of PF(8.) Therefore, the microstructure and photophysical properties of PF(8)/PF(2/6) in MCH solution can be tuned by the composition of the two polymers.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP201807752	Poly(9,9-di-n-hexylfluorenyl-2,7-diyl)		201807-75-2	Price

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