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Qian, Zhiyuan; Cao, Zhiqiang; Galuska, Luke; Zhang, Song; Xu, Jie; Gu, Xiaodan
Macromolecular chemistry and physics, June 2019, Letnik: 220, Številka: 11Journal Article
Conjugated polymers are emerging as promising building blocks for a broad range of modern applications including skin‐like electronics, wearable optoelectronics, and sensory technologies. In the past three decades, the optical and electronic properties of conjugated polymers have been extensively studied, while their thermomechanical properties, especially the glass transition phenomenon which fundamentally represents the polymer chain dynamics, have received much less attention. Currently, there is a lack of design rules that underpin the glass transition temperature of these semirigid conjugated polymers, putting a constraint on the rational polymer design for flexible stretchable devices and stable polymer glass that is needed for the devices’ long‐term morphology stability. In this review article, the glass transition phenomenon for polymers, glass transition theories, and characterization techniques are first discussed. Then previous studies on the glass transition phenomenon of conjugated polymers are reviewed and a few empirical design rules are proposed to fine‐tune the glass transition temperature for conjugated polymers. The review paper is finished with perspectives on future directions on studying the glass transition phenomena of conjugated polymers. The goal of this perspective is to draw attention to challenges and opportunities of controlling, predicting, and designing polymeric semiconductors, specifically to accommodate their end use. This paper reviews the glass transition phenomenon of conjugated polymers. The glass transition temperature data for a broad range of conjugated polymers are compiled and discussed. Empirical design rules are proposed to guide the fine‐tuning of glass transition in conjugated polymers. The challenges and opportunities in understanding glass transition and connecting it to the end‐use performance are also discussed.
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in: SICRIS
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