TY - JOUR
T1 - High-efficiency improvement of thermal conductivities for epoxy composites from synthesized liquid crystal epoxy followed by doping BN fillers
AU - Yang, Xutong
AU - Zhu, Jiahua
AU - Yang, Dong
AU - Zhang, Junliang
AU - Guo, Yongqiang
AU - Zhong, Xiao
AU - Kong, Jie
AU - Gu, Junwei
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/3/15
Y1 - 2020/3/15
N2 - Liquid crystal epoxy resin presents high intrinsic thermal conductivity coefficient (λ). However, the complex molecular structure design and tedious synthesis process severely limit its rapid development and further industrial application. In this work, a kind of liquid crystal epoxy (LCE) based on biphenyl mesomorphic unit is synthesized from 4,4′-biphenol, triethylene glycol, and epichlorohydrin. Curing agent of 4,4′-diaminodiphenyl methane (DDM) and boron nitride (BN) fillers are both performed to prepare the intrinsic highly thermally conductive liquid crystal epoxy resin (LCER) and BN/LCER thermally conductive composites via casting method. LCE has been successfully synthesized with expected structure, presenting nematic liquid crystal with range of 135–165 °C. LCER shows liquid crystal property with intrinsic λ up to 0.51 W/mK, about 3 times higher than that of general bisphenol A epoxy resin (E−51, 0.19 W/mK). Simultaneously, LCER has good thermal stability with heat resistance index (THRI) being 183.9 °C. In addition, the λ values of the BN/LCER thermally conductive composites increase with the increasing loading of BN fillers. When the content of BN fillers is 30 wt%, the λ value of BN/LCER thermally conductive composites is 1.02 W/mK, twice as much as that of pure LCER, also much higher than that of 30 wt% BN/E−51 composites (0.52 W/mK).
AB - Liquid crystal epoxy resin presents high intrinsic thermal conductivity coefficient (λ). However, the complex molecular structure design and tedious synthesis process severely limit its rapid development and further industrial application. In this work, a kind of liquid crystal epoxy (LCE) based on biphenyl mesomorphic unit is synthesized from 4,4′-biphenol, triethylene glycol, and epichlorohydrin. Curing agent of 4,4′-diaminodiphenyl methane (DDM) and boron nitride (BN) fillers are both performed to prepare the intrinsic highly thermally conductive liquid crystal epoxy resin (LCER) and BN/LCER thermally conductive composites via casting method. LCE has been successfully synthesized with expected structure, presenting nematic liquid crystal with range of 135–165 °C. LCER shows liquid crystal property with intrinsic λ up to 0.51 W/mK, about 3 times higher than that of general bisphenol A epoxy resin (E−51, 0.19 W/mK). Simultaneously, LCER has good thermal stability with heat resistance index (THRI) being 183.9 °C. In addition, the λ values of the BN/LCER thermally conductive composites increase with the increasing loading of BN fillers. When the content of BN fillers is 30 wt%, the λ value of BN/LCER thermally conductive composites is 1.02 W/mK, twice as much as that of pure LCER, also much higher than that of 30 wt% BN/E−51 composites (0.52 W/mK).
KW - Boron nitride
KW - Intrinsic
KW - Liquid crystal epoxy (LCE)
KW - Thermally conductive composites
UR - http://www.scopus.com/inward/record.url?scp=85078255406&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2020.107784
DO - 10.1016/j.compositesb.2020.107784
M3 - 文章
AN - SCOPUS:85078255406
SN - 1359-8368
VL - 185
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
M1 - 107784
ER -