Tunable Thermal Switch via Order–Order Transition in Liquid Crystalline Block Copolymer,Nano Letters

当前位置： X-MOL 学术 › Nano Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Tunable Thermal Switch via Order–Order Transition in Liquid Crystalline Block Copolymer
Nano Letters ( IF 9.6 ) Pub Date : 2022-07-26 , DOI: 10.1021/acs.nanolett.2c01100
Takafumi Ishibe ₁ , Tatsuya Kaneko ₁ , Yuto Uematsu ₁ , Hideo Sato-Akaba ₁ , Motonori Komura ₂ , Tomokazu Iyoda ₃ , Yoshiaki Nakamura ₁

Affiliation

Organic material-based thermal switch is drawing much attention as one of the key thermal management devices in organic electronic devices. This study aims at tuning the switching temperature (T_S) of thermal conductivity by using liquid crystalline block copolymers (BCs) with different order–order transition temperature (T_tr) related to the types of mesogens in the side chain. The BC films with low T_tr of 363 K and high T_tr of 395 K exhibit reversible thermal conductivity switching behaviors at T_S of ∼360 K and ∼390 K, respectively. The BC films also exhibit thermal conductivity variation originating from the anisotropy of the internal structures: poly(ethylene oxide) domains and liquid crystals. These results demonstrate that the switching behavior is attributed to an order–order transition between BC films with vertically arranged cylinder domains and the ones with ordered sphere domains. This highlights that BCs become a promising thermal conductivity switching material with tailored T_S.

中文翻译：

通过液晶嵌段共聚物中的有序转变可调谐热开关

基于有机材料的热敏开关作为有机电子器件中的关键热管理器件之一而备受关注。本研究旨在通过使用具有与侧链中介晶类型相关的不同阶序转变温度 ( T _tr )的液晶嵌段共聚物 (BCs) 来调节热导率的转换温度 ( T _{S )。}具有363 K的低T _{tr和 395 K 的高}T _tr的 BC 薄膜在T _S下表现出可逆的热导率转换行为分别为~360 K和~390 K。BC 薄膜还表现出源自内部结构的各向异性的热导率变化：聚（环氧乙烷）域和液晶。这些结果表明，切换行为归因于具有垂直排列的圆柱域和具有有序球域的 BC 薄膜之间的有序转变。这突出表明，BCs 成为具有定制T _S的有前途的热导转换材料。

更新日期：2022-07-26

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11