Nonmonotonic dielectric relaxation behavior of thermochromic epoxy composite

Jian Gao; Yiwei Long; Kangning Wu; Jianying Li; Guilai Yin

doi:10.1016/j.matlet.2022.131678

Nonmonotonic dielectric relaxation behavior of thermochromic epoxy composite

Jian Gao
, Yiwei Long
, Kangning Wu
, Jianying Li
, Guilai Yin

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

An unusual nonmonotonic relaxation behavior is observed in thermochromic epoxy composites. The relaxation time first decreases with temperature and then abnormally increases from 331 K to 337 K, exhibiting a saddlelike temperature dependence. The nonmonotonic relaxation behavior is proposed to originate from the phase transformation of solvent in microcapsules based on the model of confined system. It is evidenced that from 331 K to 339 K the solvent is in rotational state with increased interchain distances and chain mobility. This could decrease the free volume given for relaxation in microcapsules and consequently result in the increase of relaxation time.

Original language	English
Article number	131678
Journal	Materials Letters
Volume	312
DOIs	https://doi.org/10.1016/j.matlet.2022.131678
State	Published - 1 Apr 2022

Keywords

Confined system
Nonmonotonic dielectric relaxation
Phase transformation
Polymeric composites

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10.1016/j.matlet.2022.131678

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title = "Nonmonotonic dielectric relaxation behavior of thermochromic epoxy composite",

abstract = "An unusual nonmonotonic relaxation behavior is observed in thermochromic epoxy composites. The relaxation time first decreases with temperature and then abnormally increases from 331 K to 337 K, exhibiting a saddlelike temperature dependence. The nonmonotonic relaxation behavior is proposed to originate from the phase transformation of solvent in microcapsules based on the model of confined system. It is evidenced that from 331 K to 339 K the solvent is in rotational state with increased interchain distances and chain mobility. This could decrease the free volume given for relaxation in microcapsules and consequently result in the increase of relaxation time.",

keywords = "Confined system, Nonmonotonic dielectric relaxation, Phase transformation, Polymeric composites",

author = "Jian Gao and Yiwei Long and Kangning Wu and Jianying Li and Guilai Yin",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = apr,

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doi = "10.1016/j.matlet.2022.131678",

language = "英语",

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journal = "Materials Letters",

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TY - JOUR

T1 - Nonmonotonic dielectric relaxation behavior of thermochromic epoxy composite

AU - Gao, Jian

AU - Long, Yiwei

AU - Wu, Kangning

AU - Li, Jianying

AU - Yin, Guilai

PY - 2022/4/1

Y1 - 2022/4/1

N2 - An unusual nonmonotonic relaxation behavior is observed in thermochromic epoxy composites. The relaxation time first decreases with temperature and then abnormally increases from 331 K to 337 K, exhibiting a saddlelike temperature dependence. The nonmonotonic relaxation behavior is proposed to originate from the phase transformation of solvent in microcapsules based on the model of confined system. It is evidenced that from 331 K to 339 K the solvent is in rotational state with increased interchain distances and chain mobility. This could decrease the free volume given for relaxation in microcapsules and consequently result in the increase of relaxation time.

AB - An unusual nonmonotonic relaxation behavior is observed in thermochromic epoxy composites. The relaxation time first decreases with temperature and then abnormally increases from 331 K to 337 K, exhibiting a saddlelike temperature dependence. The nonmonotonic relaxation behavior is proposed to originate from the phase transformation of solvent in microcapsules based on the model of confined system. It is evidenced that from 331 K to 339 K the solvent is in rotational state with increased interchain distances and chain mobility. This could decrease the free volume given for relaxation in microcapsules and consequently result in the increase of relaxation time.

KW - Confined system

KW - Nonmonotonic dielectric relaxation

KW - Phase transformation

KW - Polymeric composites

UR - https://www.scopus.com/pages/publications/85122633728

U2 - 10.1016/j.matlet.2022.131678

DO - 10.1016/j.matlet.2022.131678

M3 - 文章

AN - SCOPUS:85122633728

SN - 0167-577X

VL - 312

JO - Materials Letters

JF - Materials Letters

M1 - 131678

ER -

Nonmonotonic dielectric relaxation behavior of thermochromic epoxy composite

Abstract

Keywords

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