Aggregation properties of MEH-PPV/PMMA blends in solution and thin film
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- 作者：Chien-You Su ; Chi-Chung Hua
- 关键词：Polymer blend ; Aggregate ; Light scattering ; Photoluminescence
- 刊名：Journal of Polymer Research
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：24
- 期：1
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
- 出版者：Springer Netherlands
- ISSN：1572-8935
- 卷排序：24
文摘
We conducted the first in-depth investigation into the (modified) aggregation state of poly-[2-methoxy-5-(2′-ethylhexoxy)-1,4-phenylenevinylene] (MEH-PPV)/poly(methyl methacrylate) (PMMA)/toluene solution and solution-cast thin film to shed light on prior research reporting diverse, often ambiguous, trends regarding the efficacy of blending an optically inert polymer with conjugated polymer for optoelectronic applications. The major innovation consists in systematically correlating the characteristic ratio a1/a2 extracted from photoluminescence spectrum, which assesses the relative contribution of intrachain-exciton and interchain-aggregate species to light emission in thin film, with the ρ-ratio obtained from (index-matching) dynamic/static light scattering analyses, which reveals the structural compactness of aggregates in solution. We elucidated that this strategy led to an unambiguous revelation of the individual effects of MEH-PPV concentration, PMMA molecular weight, and the blending ratio—three essential factors not identified or discriminated previously—and shed light on the underlying MEH-PPV/PMMA interactions in solution that ultimately determine the optical performance of solution-cast thin film.