本征型导热液晶聚合物的制备及导热模型构建:一种提升聚合物基体热导率的方法  

Preparation of Liquid Crystalline Polymer with Intrinsic Thermal Conductivity and Establishment of Thermal Conductivity Model:a Method of Increasing Polymer Matrix Thermal Conductivity

作　　者：李颖[1] 李成功 后振中[1] 张亮[2] 杨庆浩[1] 刘心怡 LI Ying;LI Chenggong;HOU Zhenzhong;ZHANG Liang;YANG Qinghao;LIU Xinyi(College of Material Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Department of the Tender and Supply,the First Affiliated Hospital of Xi’an Jiaotong University,Xi’an 710061,China)

机构地区：[1]西安科技大学材料科学与工程学院,西安710054 [2]西安交通大学医学院第一附属医院招标采供办公室,西安710061

出　　处：《材料导报》2020年第10期10192-10196,共5页Materials Reports

基　　金：国家自然科学基金(51903207);陕西省重点研发计划项目(2018GY-115,2018GY-174);陕西省留学人员科技活动择优资助项目(2017030)。

摘　　要：合成含有刚性液晶基元的液晶聚合物(LCP),利用完整的聚合物网络与液晶基元的取向有序来提高LCP分子链的有序排列,构建以微观有序结构为基础的声子传递互通网络,保证聚合物基体高热导率的实现。采用傅里叶变换红外光谱(FTIR)进行结构表征,偏光显微镜(POM)和差示扫描量热(DSC)仪进行液晶性能分析,扫描电镜(SEM)进行微观形貌分析,热重分析(TGA)仪进行热性能研究,并对LCP膜的导热性进行测试(λ=α·ρ·C p)。结果表明,LCP 1和LCP 2均呈现出微观有序性,具有较高的热导率,分别为0.79 W/(m·K)和0.72 W/(m·K),且热导率随液晶基元含量的增加而有所提高。此外,LCP 1和LCP 2还具有较高的热稳定性,其熔点温度(T m)和质量损失5%时的温度(T d(5wt%))最高分别为230℃和420.36℃。该结果丰富了本征型导热液晶聚合物的研究基础,扩大了液晶聚合物的应用范围。Liquid crystalline polymers(LCPs)containing rigid mesogenic monomer were synthesized.The ordered arrangement of molecular chain in LCP were increased via integrated networks of polymers and spontaneously ordered arrangement of mesogenic monomers.The phonon transmission interflow net based on microscopic-ordered structure was built and the high thermal conductivity of polymer matrix was ensured.Chemical structures were characterized by Fourier transform infrared(FTIR).Liquid crystalline properties were analyzed by polarizing optical microscope(POM)and differential scanning calorimetry(DSC).Microstructures were observed by scanning electron microscopy(SEM).Thermal conductivities were researched by thermogravimetric analysis(TGA).And the thermal conductivities of LCPs films were tested as following:λ=α·ρ·C p.The results indicated that:LCP 1 and LCP 2 both exhibited microscopic-ordered structures and possessed high thermal conductivities,0.79 W/(m·K)and 0.72 W/(m·K)respectively.The thermal conductivity increased with the increasing of mesogenic monomer content grafted into PMHS.In addition,LCP 1 and LCP 2 showed high thermal stabilities,the highest melting temperature(T m)and 5%weight loss temperature(T d(5wt%))reaches 230℃and 420.36℃respectively.Results enrich the research foundation of intrinsic thermal conductivity liquid crystalline polymers and expand the application of liquid crystalline polymers.

关 键 词：微观有序结构 高热导率 声子传递互通网络 侧链液晶聚合物 

分 类 号：TM211[一般工业技术—材料科学与工程]