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.

中文翻译：

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聚合物分散液晶膜中的链相互作用和有序结构对热导率的影响

摘要 将含有交联结构的液晶聚硅氧烷（液晶聚硅氧烷弹性体（LCPE））分散在聚乙烯醇（PVA）中，制备了具有固有热导率的聚合物分散液晶（PDLC）膜。化学结构通过傅里叶变换红外（FT-IR）和1H-NMR表征，微观结构通过偏光显微镜（POM）、扫描电子显微镜（SEM）和X射线衍射（XRD）进行分析。PDLC膜的导热系数采用热盘式热常数分析仪进行表征，拉伸性能采用拉伸试验机进行测量。热性能通过差示扫描量热仪 (DSC) 和热重分析仪 (TGA) 进行表征。结果表明，LCPE均匀地分散在PVA中，LCPE的介晶单体在PDLC膜中形成微观有序结构。同时，LCPE和PVA链之间形成了氢键相互作用。微观有序结构和氢键相互作用都改善了声子传输路径，PDLC膜的热导率高达0.74 W/m·K，是纯PVA膜的6倍。PDLC 膜具有适当的拉伸强度和断裂伸长率，分别为 5.18 MPa 和 338%。因此，PDLC膜可用作电子封装等相关领域的导热膜。微观有序结构和氢键相互作用都改善了声子传输路径，PDLC膜的热导率高达0.74 W/m·K，是纯PVA膜的6倍。PDLC 膜具有适当的拉伸强度和断裂伸长率，分别为 5.18 MPa 和 338%。因此，PDLC膜可用作电子封装等相关领域的导热膜。微观有序结构和氢键相互作用都改善了声子传输路径，PDLC膜的热导率高达0.74 W/m·K，是纯PVA膜的6倍。PDLC 膜具有适当的拉伸强度和断裂伸长率，分别为 5.18 MPa 和 338%。因此，PDLC膜可用作电子封装等相关领域的导热膜。