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聚偏二氟乙烯γ晶型结构中红外光谱研究

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采用中红外(MIR)光谱(包括:一维MIR光谱、二阶导数MIR光谱、四阶导数MIR光谱及去卷积MIR光谱)分别开展聚偏二氟乙烯(PVDF)γ晶型结构研究.实验发现,303 K温度下,PVDFγ晶型结构的红外吸收频率(v(γ晶型结构-去卷积))为1 235.75 cm-1.采用去卷积变温MIR光谱进一步开展了温度变化对于PVDF γ晶型结构的影响研究.实验发现,在303～523 K,随着测定温度的升高,PVDF(γ晶型结构-去卷积)对应的吸收强度增加.温度的增加会促进PVDF部分α晶型及β晶型转变为γ晶型.采用二维MIR光谱进一步开展了 PVDF γ晶型结构热变性的研究.在303～523 K,PVDF γ晶型结构吸收峰对于温度变化的敏感程度及变化快慢信息均存在着一定的差异.相变前,PVDF γ晶型结构吸收峰变化快慢信息为:1 237 cm-1处(v(γ晶型结构-2-二维-相变前))吸收峰变化早于1 241 cm-1处(v(γ晶型结构-1-二维-相变前))吸收峰;相变过程中,PVDFγ晶型结构吸收峰变化快慢信息依次为:1 244 cm-1处(v(γ晶型结构-1-二维-相变过程中))吸收峰、1 239 cm-1处(v(γ晶型结构-2-二维-相变过程中))吸收峰、1 236 cm-1处(v(γ晶型结构-3-二维-相变过程中))吸收峰和1 234 cm-1处(v(γ晶型结构-4-二维-相变过程中))吸收峰.
Mid-infrared spectroscopic study of the γ-crystalline structure of polyvinylidene fluoride
The mid-infrared(MIR)spectroscopy(including one dimensional MIR spectroscopy,second-order derivative MIR spectroscopy,fourth-order derivative MIR spectroscopy,and deconvolution MIR spectroscopy)was used to study the γ-crystalline structure of polyvinylidene fluoride(PVDF),respectively.It was found that at 303 K,the infrared absorption frequency(v(γ-crystalline structure-deconvolution))of the γ-crystalline structure of PVDF was 1 235.75 cm-1.The effect of temperature variation on the the γ-crystalline structure of PVDF was further investigated by using the deconvolution temperature-dependent MIR spectroscopy.It was found that the absorption intensity of PVDF(γ-crystalline structure-deconvolution)increased with the increase of the determined temperature at 303～523 K.The increase of temperature could promote the transformation of some α-crystalline and β-crystalline forms of PVDF intoγ-crystalline forms.The thermal denaturation of γ-crystalline structure in PVDF was further investigated by using the two dimensional MIR spectroscopy.At 303～523 K,the sensitive degree of the absorption peak of γ-crystalline structure in PVDF to the variation of temperature and the changing speed information were somewhat different.Before the phase transition,the information on the variation speed of the absorption peak of γ-crystalline structure in PVDF was as follows:the absorption peak at 1 237 cm-1(v(γ-crystalline structure-2-two dimensional-before the phase transition))changed earlier than the absorption peak at 1 241 cm-1(v(γ-crystalline structure-1-two dimensional-before the phase transition));during the phase transition process,the variation speed of the absorption peak of y-crystalline structure in PVDF was in the following order:the absorption peak at 1 244 cm-1(v(γ-crystalline structure-1-two dimensional-during the phase transition process)),absorption peak at 1 239 cm-1(v(γ-crystalline structure-2-two dimensional-during the phase transition process)),absorption peak at 1 236 cm-1(v(γ-crystalline structure-3-two dimensional-during the phase transition process)),and absorption peak at 1 234 cm-1(v(γ-crystalline structure-4-two dimensional-during the phase transition process)).

polyvinylidene fluoridemid-infrared spectroscopytemperature-dependent mid-infrared spectroscopytwo-dimensional mid-infrared spectroscopyγ-crystalline structure

常利双、柴嘉欣、王宁、杨子佳、游子涵、于宏伟

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石家庄学院化工学院,河北石家庄 050035

河北省麻醉药技术创新中心,河北石家庄 050035

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 γ晶型结构

石家庄市麻醉药技术创新中心项目河北省生物制药国际联合中心项目

石科[2019]34号冀科外函[2022]3号

2024

10.16572/j.issn1672-2191.202409067

化学推进剂与高分子材料
黎明化工研究院有限责任公司

化学推进剂与高分子材料

影响因子：0.289
ISSN：1672-2191
年,卷(期)：2024.22(5)