【摘要】 采用中红外（MIR）光谱研究聚偏氟乙烯（PVDF）分子α晶体结构，采用变温中红外（TD-MIR）光谱及二维中红外（2D-MIR）光谱研究PVDF分子α晶体结构的热稳定性。结果表明：PVDF分子α晶体结构的去卷积MIR光谱的谱图分辨能力要优于一维MIR光谱、二阶导数MIR光谱、四阶导数MIR光谱；30℃的温度条件下，PVDF分子α晶体结构的红外吸收模式包括ν_{-α-5-去卷积}(1 214.88 cm^-1)、ν_{-α-4-去卷积}(974.79 cm^-1)、ν_{-α-3-去卷积}(795.79 cm^-1)、ν_{-α-2-去卷积}(763.02 cm^-1)及ν_{-α-1-去卷积}(615.03 cm^-1);30～250℃的TD-MIR光谱中，随着测定温度的升高，PVDF分子α晶体结构ν_{-α-4-去卷积}、ν_{-α-3-去卷积}、ν_{-α-2-去卷积}和ν_{-α-1-去卷积}对应的吸收强度都有明显地减少，升高温度会促进PVDF分子α晶体结构转变为β晶体结构；30～250℃的2D-MIR光谱中，PVDF分子α晶体结构对于温度变化敏感程度及变化快慢信息均存在着一定的差异性，其中PVDF分子ν_-α-3-二维对应的晶体结构对于温度变化最为敏感，随着温度的升高，其结构最先改变，而ν_-α-2-二维对应的晶体结构则相对较为稳定。更多还原

【Abstract】 The α crystal structure of polyvinylidene fluoride（PVDF） molecule was studied by middle infrared（MIR） spectroscopy, and the thermal stability of α crystal structure of PVDF molecule by temperature-dependent MIR spectroscopy（TD-MIR） and two-dimensional MIR spectroscopy（2D-MIR）. The results showed that the spectral resolution of deconvoluted MIR spectrum was better than that of one-dimensional MIR spectrum, second derivative MIR spectrum and fourth derivative MIR spectrum of the α crystal structure of PVDF molecule; the infrared absorption modes of the α crystal structure of PVDF molecule at 30 ℃ included ν_{-α-5-deconvolution}(1 214.88 cm^-1), ν_{-α-4-deconvolution} (974.79 cm^-1), ν_{-α-3-deconvolution} (795.79 cm^-1), ν_{-α-2-deconvolution}(763.02 cm^-1) and ν_{-α-1-deconvolution}(615.03 cm^-1);the absorption intensity corresponding to the α crystal structure of PVDF molecule, including ν_{-α-4-deconvolution}, ν_{-α-3-deconvolution}, ν_{-α-2-deconvolution} and ν_{-α-1-deconvolution}, was observed to obviously reduce with the increase of measurement temperature within the range of 30-250 ℃ by TD-MIR, and the temperature elevation would promote the α crystal structure of PVDF molecule to change into β crystal structure; the sensitivity of the α crystal structure of PVDF molecule to temperature variation and the information of varying speed was different within the temperature range of 30-250 ℃ in 2D-MIR spectra; and the crystal structure of PVDF molecule corresponding to ν_-α-3-2D was most sensitive to temperature variation and its structure changed first with the increase of temperature, while the crystal structure corresponding to ν_-α-2-2D was relatively stable.更多还原