Liquid crystalline texture and hydrogen bond on the thermal conductivities of intrinsic thermal conductive polymer films

doi:10.1016/j.jmst.2021.01.017

J. Mater. Sci. Technol. ›› 2021, Vol. 82: 250-256.DOI: 10.1016/j.jmst.2021.01.017

• Research Article • Previous Articles

Liquid crystalline texture and hydrogen bond on the thermal conductivities of intrinsic thermal conductive polymer films

Ying Li^a^,^*(), Changdan Gong^a, Chenggong Li^a, Kunpeng Ruan^b^,^c^,^d, Chao Liu^a, Huan Liu^a, Junwei Gu^b^,^*()

^aCollege of Material Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China
^bShaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
^cResearch & Development Institute of Northwestern, Polytechnical University in Shenzhen, Shenzhen, 518057, China
^dSchool of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023, China

Received:2020-12-02 Revised:2021-01-05 Accepted:2021-01-05 Published:2021-01-26 Online:2021-01-26
Contact: Ying Li,Junwei Gu
About author:gjw@nwpu.edu.cn, nwpugjw@163.com (J. Gu).
∗ E-mail addresses: liyingxust@126.com (Y. Li),

Abstract

Abstract:

Polymer-dispersed liquid crystal (PDLC) films comprising polyvinyl alcohol (PVA) and liquid crystal monomer (LCM) were successfully obtained by the method of solution casting & thermal compressing. LCM was distributed orderly in PVA matrix by hydrogen bond interaction, to form PVA-LCM interpenetrating-layered networks. When the mass fraction of LCM was up to 35 wt%, the corresponding in-plane thermal conductivity coefficient (λ_//) of PDLC film was significantly increased to 1.41 W m^-1 K^-1, about 10.8 times that of neat PVA (0.13 W m^-1 K^-1). High intrinsic λ_// values of PDLC films were mainly attributed to the formed microscopic-ordered structures from ordered stacking of LCM, ordered arrangement of PVA chains, and their hydrogen bond interaction. This work would offer a new way to design and prepare novel intrinsic high thermal conductive polymers.

Key words: Liquid crystal monomer (LCM), Polyvinyl alcohol (PVA), Intrinsic high thermal conductivity, Hydrogen bond interaction

Ying Li, Changdan Gong, Chenggong Li, Kunpeng Ruan, Chao Liu, Huan Liu, Junwei Gu. Liquid crystalline texture and hydrogen bond on the thermal conductivities of intrinsic thermal conductive polymer films[J]. J. Mater. Sci. Technol., 2021, 82: 250-256.

Figures/Tables 8

Fig. 1. Schematic diagram of the synthesis route for LCM.

Fig. 2. FTIR spectra of 4, 4′-dihydroxydiphenyl and LCM (a); 1H NMR spectrum of LCM (b).

Fig. 3. POM images of LCM and PDLC films (×400). LCM-100 °C (a); LCM-110 °C (b); PDLC film with 15 wt% LCM-100 °C (c); PDLC film with 15 wt% LCM-110 °C (d); PDLC film with 35 wt% LCM-100 °C (e); PDLC film with 35 wt% LCM-110 °C (f).

Fig. 4. XRD spectra of LCM (a), neat PVA and PDLC films (b).

Fig. 5. SEM images of cross sections for neat PVA (a), PDLC film with 15 wt% LCM (b), and PDLC film with 35 wt% LCM (c-c’).

Fig. 6. Schematic representation of LCM stacking (a); Microscopic-ordered aggregation morphologies of PDLC films and the corresponding phonon transport model (b).

Fig. 7. λ// values of PDLC films with different mass fraction of LCM.

Fig. 8. DSC curves of LCM (a), neat PVA and PDLC films (b).

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Liquid crystalline texture and hydrogen bond on the thermal conductivities of intrinsic thermal conductive polymer films

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