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High thermal conductivity of liquid crystalline monomer‐poly (vinyl alcohol) dispersion films containing microscopic‐ordered structure
Author(s) -
Li Chenggong,
Li Ying,
Gong Changdan,
Ruan Kunpeng,
Zhong Xiao,
Pan Pan,
Liu Chao,
Gu Junwei,
Shi Xuetao
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49791
Subject(s) - vinyl alcohol , materials science , monomer , thermal conductivity , amorphous solid , dispersity , polymer , chemical engineering , thermal conduction , dispersion (optics) , polymer chemistry , thermal , composite material , crystallography , chemistry , thermodynamics , optics , physics , engineering
The thermal conductivity of bulk polymers is usually very low, which is due to the amorphous domains where chains are randomly entangled, improving the degree of the chain alignment and forming a continuous thermal conduction network are expected to enhance the thermal conductivity. A series of liquid crystalline monomer‐poly (vinyl alcohol) dispersion (MDLC) films with high thermal conductivity containing microscopic‐ordered structure were prepared by introducing a highly ordered liquid crystalline monomer (LCM) exhibiting Smectic phase. The thermal conductivity of MDLC films was strongly related to the amount of LCM, which firstly increased and then decreased with the increase of LCM content. The thermal conductivity of MDLC film reached up to 1.20 W m −1 K −1 when the content of LCM was 15 wt% and rapidly decreased to 0.85 W m −1 K −1 as the content of LCM further increased to 25 wt%. LCM with low content (1–15 wt%) showed good fluidity, dispersity and interfacial compatibility in PVA molecular chains, which further increases the regularity of molecular chains alignment.