聚偏二氟乙烯分子晶型结构及热变性研究  

Crystal Structure and Thermal Denaturation of Polyvinylidene Difluoride Molecular

作　　者：张碧涵 戎媛 王晓萱 常明[2] 张勇[1] 于宏伟[2] 徐元媛 ZHANG Bi-han;RONG Yuan;WANG Xiao-xuan;CHANG Ming;ZHANG Yong;YU Hong-wei;XU Yuan-yuan(School of Chemical and Pharmaceutical Engineering,Hebei University of Science&Technology,Shijiazhuang 050018,China;College of Chemical Technology,Shijiazhuang University,Shijiazhuang 050035,China)

机构地区：[1]河北科技大学化学与制药工程学院,石家庄050018 [2]石家庄学院化工学院,石家庄050035

出　　处：《科学技术与工程》2022年第26期11533-11541,共9页Science Technology and Engineering

基　　金：河北省高等学校科学技术研究项目(ZC2021250);河北省麻醉药技术创新中心自研项目(SG2019010);石家庄学院博士科研启动基金(20BS008)。

摘　　要：压电材料是一种材料变形时能产生电压的智能材料。聚偏二氟乙烯因具有优良的压电性能而受到广泛关注。首先,采用中红外光谱开展聚偏二氟乙烯分子的晶型结构研究。聚偏二氟乙烯分子的晶型主要包括:α晶型、β晶型及γ晶型。其次,开展聚偏二氟乙烯分子变温中红外光谱及二维中红外光谱研究。结果表明,随着测定温度由303 K升高至523 K,聚偏二氟乙烯分子α晶型、β晶型及γ晶型对应的红外吸收频率及强度均有明显的改变,其晶型对热敏感程度及变化顺序都存在着较大的差异性。最后,对聚偏二氟乙烯分子进行晶型互变机理的研究。本文研究拓展了三级中红外光谱(包括:中红外光谱、变温中红外光谱及二维中红外光谱)在重要的具有压电特性的功能性高分子材料(聚偏二氟乙烯)分子晶型结构及热变性的研究范围。Piezoelectric material is a kind of intelligent material which can generate voltage when the material is deformed.Polyvinylidene fluoride(PVDF)is widely studied for its excellent piezoelectric properties.Firstly,the crystal structure of polyvinylidene difluoride molecular was studied by middle infrared(MIR)spectroscopy.The crystal structure of polyvinylidene difluoride molecular includesαcrystal structure,βcrystal structure andγcrystal structure.Secondly,Temperature-dependent middle infrared(TD-MIR)spectroscopy and two dimensional middle infrared(2D-MIR)spectroscopy of polyvinylidene difluoride molecular were studied.With the increase of the temperature from 303 K to 523 K,the corresponding frequency and absorption intensity of polyvinylidene difluoride molecular crystal structure changed obviously,the crystal structure of polyvinylidene difluoride molecular was sensitive to the temperature.The crystal structure interchange mechanism was studied at length.The three-step MIR spectroscopy(MIR,TD-MIR and 2D-MIR)can broaden the scope of the analysis of crystal structure and thermal denaturation of the important functional polymer materials with piezoelectric properties(polyvinylidene difluoride).

关 键 词：聚偏二氟乙烯 中红外光谱 变温中红外光谱 二维中红外光谱 压电材料 

分 类 号：TQ311[化学工程—高聚物工业]