文章摘要
聚三氟氯乙烯结晶形态调控对其高频介电性能的影响
Effects of Crystalline Morphology on the High-Frequency Dielectric Properties of Poly(trifluorochloroethylene)
  
DOI:10.16865/j.cnki.1000-7555.2018.06.008
中文关键词: 介电性能  聚三氟氯乙烯  等温热处理  淬火  结晶
英文关键词: dielectric property  poly(trifluorochloroethylene)  isothermal heat-treatment  quench  crystallization
基金项目:国家自然科学基金创新研究群体科学基金(51721091)
作者单位
宋杭岭, 韩艾纯, 张 瑶, 陈 蓉, 李 姜, 郭少云 高分子材料工程国家重点实验室 四川大学高分子研究所四川 成都 610065 
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中文摘要:
      通过调控聚三氟氯乙烯(PCTFE)的结晶及形态结构,研究其对PCTFE高频介电性能的影响。采用淬火处理、175 ℃和185 ℃等温热处理方式制备了不同结晶形态和结晶度的PCTFE,通过差示扫描量热分析和偏光显微镜表征不同热处理工艺下PCTFE的结晶形态结构,并采用带状线谐振法研究了不同结晶行为的PCTFE在高频交变电场下的介电性能。结果表明,淬火处理使PCTFE结晶不完善,仅生成细小的晶粒;而在175 ℃及以上进行等温热处理时,PCTFE链端更易排列进入晶格,生成球晶。等温温度越高,球晶尺寸越大,185 ℃等温1h后球晶尺寸达到36~42 μm。高频电场下,淬火方式制备的低结晶度和较小结晶尺寸的PCTFE具有最低的介电常数和介电损耗,满足高频信号传输需求。
英文摘要:
      Poly(trifluorochloroethylene) (PCTFE) with different crystalline morphologies was prepared through different heat-treatments, and the high-frequency dielectric properties of PCTFE (>1 GHz) were investigated. Different heat treatments, such as quenching and isothermally treated at 175 ℃ or 185 ℃ for 1 h, were used to obtain PCTFE with different crystalline morphologies and crystalline degrees. Differential scanning calorimetry (DSC) and polarized optical microscope (POM) were employed to characterize the crystallization behavior of PCTFE. Stripline resonator measurement was applied to characterize the dielectric properties of PCTFE. As a result, only small crystal particles appear in PCTFE after quenching process. When PCTFE is isothermally treated at higher temperature (≥175 ℃), homogeneous nucleation of PCTFE occurs, resulting in larger crystallite size of PCTFE (about 36~42μm after isothermally treated for 1 h at 185 ℃). Under high frequency, quench sample with the lowest crystallinity and smallest crystal size has the lowest dielectric constant, and the low dielectric loss is maintained.
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