聚偏二氟乙烯δ_(CH2)三级中红外光谱研究  

Three-level MIR Spectroscopy of Polyvinylidene Difluoride(δ_(CH2))

作　　者：冯汇 戎媛 王晓萱 孔昊 鹿永鑫 吴子腾 韩明达 于宏伟[1] FENG Hui;RONG Yuan;WANG Xiao-xuan;KONG Hao;LU Yong-xin;WUZi-teng;HAN Ming-da;YU Hong-wei(School of Chemical Engineering,Shijiazhuang University,Shijiazhuang 050035)

机构地区：[1]石家庄学院化工学院,河北石家庄050035

出　　处：《纺织科学与工程学报》2021年第2期40-47,53,共9页Journal of Textile Science & Engineering

基　　金：石家庄学院2020年度专业认证专项教学改革研究与实践项目(ZXJG-202019)。

摘　　要：采用中红外(MIR)光谱开展聚偏二氟乙烯的分子结构研究.实验发现:聚偏二氟乙烯分子红外吸收模式主要包括:ν_(asCH2)、ν_(sCH2)、δ_(CH2)、ν_(asCF2)和ν_(sCF2).进一步开展了聚偏二氟乙烯分子变温中红外(TD-MIR)光谱研究.实验发现:随着测定温度的升高,聚偏二氟乙烯分子δ_(CH2)对应的红外吸收频率及强度均有明显的改变.采用二维中红外(2D-MIR)光谱,进一步开展了聚偏二氟乙烯热老化性研究.相变前,聚偏二氟乙烯分子δ_(CH2)-二维-相变前对应的吸收频率包括:1430 cm^(-1)(δ_(CH2)-二维-1-晶体-相变前)、1420 cm^(-1)(δ_(CH2)-二维-2-相变前)、1406 cm^(-1)(δ_(CH2)-二维-3-晶体-相变前)和1380 cm^(-1)(δ_(CH2)-二维-4-相变前).热扰动下,聚偏二氟乙烯分子δ_(CH2)-二维-相变前吸收峰变化快慢信息为:1430 cm^(-1)(δ_(CH2)-二维-1-晶体-相变前)>1420 cm^(-1)(δ_(CH2)-二维-2-相变前)>1380 cm^(-1)(δ_(CH2)-二维-4-相变前)>1406 cm^(-1)(δ_(CH2)-二维-3-晶体-相变前).相变过程中,聚偏二氟乙烯分子δ_(CH2)-二维-相变过程中对应的吸收频率包括:1432 cm^(-1)(δ_(CH2)-二维-1-晶体-相变过程中)、1420 cm^(-1)(δ_(CH2)-二维-2-相变过程中)、1407 cm^(-1)(δ_(CH2)-二维-3-晶体-相变过程中)、1400 cm^(-1)(δ_(CH2)-二维-4-相变过程中)和1382 cm^(-1)(δ_(CH2)-二维-5-相变过程中).热扰动下,聚偏二氟乙烯分子δ_(CH2)-二维-相变过程中吸收峰变化快慢信息为:1400 cm^(-1)(δ_(CH2)-二维-4-相变过程中)>1382 cm^(-1)(δ_(CH2)-二维-5-相变过程中)>1407 cm^(-1)(δ_(CH2)-二维-3-晶体-相变过程中)>1432 cm^(-1)(δ_(CH2)-二维-1-晶体-相变过程中)>1420 cm^(-1)(δ_(CH2)-二维-2-相变过程中).相变后,聚偏二氟乙烯分子δ_(CH2)-二维-相变后对应的吸收频率包括:1432 cm^(-1)(δ_(CH2)-二维-1-晶体-相变后)、1420 cm^(-1)(δ_(CH2)-二维-2-相变后)、1406 cm^(-1)(δ_(CH2)-二维-3-晶体-相变后)和1380 cm^(-1)(δ_(CH2)-二维-4-相变后).热扰动�The molecular structure of polyvinylidene difluoride(PVDF)was studied by infrared(MIR)spectroscopy.The experiment discovered that the infrared absorption modes of PVDF included νa_(sCH2),ν_(sCH2),δ_(CH2),νa_(sCF2) andν_(sCF2).And the temperature-dependent infrared(TD-MIR)spectroscopy of PVDF were studied also.With the increase of the temperature,the corresponding infrared absorption frequency and intensity of PVDF(δ_(CH2))changed obviously.The thermal aging properties of PVDF were considered by two dimensional infrared(2D-MIR)spectroscopy.Before phase transition,the corresponding absorption frequency of PVDF(δ_(CH2)-2D-before phase transition)included 1430cm^(-1)(δ_(CH2)-2D-1-crystal-before phase transition),1420cm^(-1)(δ_(CH2)-2D-2-before phase transition),1406 cm^(-1)(δ_(CH2)-2D-3-crystal-before phase transition)and 1380cm^(-1)(δ_(CH2)-2D-4-before phase transition).Under thermal disturbance,the sequence of infrared absorption peak change of PVDF(δ_(CH2)-2D-before phase transition)were 1430cm^(-1)(δ_(CH2)-2D-1-crystal-before phase transition)>1420cm^(-1)(δ_(CH2)-2D-2-before phase transition)>1380cm^(-1)(δ_(CH2)-2D-4-before phase transition)>1406 cm^(-1)(δ_(CH2)-2D-3-crystal-before phase transition).During phase transition,the corresponding infrared absorption frequency of PVDF(δ_(CH2)-2D-during phase transition)included 1432 cm^(-1)(δ_(CH2)-2D-1-crystal-during phase transition),1420 cm^(-1)(δ_(CH2)-2D-2-during phase transition),1407 cm^(-1)(δ_(CH2)-2D-3-crystal-during phase transition),1400 cm^(-1)(δ_(CH2)-2D-4-during phase transition)and 1382 cm^(-1)(δ_(CH2)-2D-5-during phase transition).Under thermal disturbance,the sequence of infrared absorption peak change of PVDF(δ_(CH2)-2D-during phase transition)were 1400 cm^(-1)(δ_(CH2)-2D-4-during phase transition)>1382 cm^(-1)(δ_(CH2)-2D-5-during phase transition)>1407 cm^(-1)(δ_(CH2)-2D-3-crystal-during phase transition)>1432 cm^(-1)(δ_(CH2)-2D-1-crystal-during phase transition)>1420 cm^(-1)(δ_(CH2)-2D-2-during phase transition).After phas

关 键 词：聚偏二氟乙烯 红外光谱 变温红外光谱 二维红外光谱 结构 热老化性 

分 类 号：TS101.921.52[轻工技术与工程—纺织工程]