Abstract
Polymer dispersed liquid crystalline (PDLC) membrane with intrinsic thermal conductivity was prepared by dispersing liquid crystalline polysiloxane containing crosslinked structure (liquid crystalline polysiloxane elastomer (LCPE)) into polyvinyl alcohol (PVA). Chemical structures were characterized by Fourier transform infrared (FT-IR) and 1H-NMR, and microscopic structures were analyzed by polarizing optical microscope (POM), scanning electron microscope (SEM) and X-ray diffraction (XRD). The thermal conductivity of PDLC membrane was characterized by hot disk thermal constants analyzer, and the tensile properties were measured by tensile testing machine. Thermal properties were characterized by differential scanning calorimeter (DSC) and thermal gravimetric analyzer (TGA). The results show that LCPE was dispersed in PVA uniformly, and the mesogenic monomer of LCPE formed microscopic ordered structures in PDLC membrane. Meanwhile, hydrogen-bond interaction was formed between LCPE and PVA chain. Both microscopic-ordered structure and the hydrogen-bond interaction improved the phonon transmission path, and the thermal conductivity of PDLC membrane was up to 0.74 W/m⋅K, which was 6 times higher than that of pure PVA film. PDLC membrane possessed proper tensile strength and elongation at break, respectively 5.18 MPa and 338%. As a result, PDLC membrane can be used as thermal conductive membrane in electronic packaging and other related fields.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 51903207, 51577154
Funding source: Priority Research and Development Foundations of Shaanxi Provincial Government
Award Identifier / Grant number: 2018GY-174, 2018GY-115
Funding source: Science and Technology activity Foundation for overseas person of Shaanxi Provincial Government
Award Identifier / Grant number: 2017030
Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The authors would like to thank the National Natural Science Foundation of China (project nos. 51903207 and 51577154), Priority Research and Development Foundations of Shaanxi Provincial Government (project nos. 2018GY-174 and 2018GY-115), the Science and Technology Activity Foundation for overseas person of Shaanxi Provincial Government (project no. 2017030) for financial support of this work.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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