Mid infrared spectroscopic study on amorphous phase structure of polytetrafluoroethylene
The structural study of the amorphous phase of polytetrafluoroethylene was carried out using three types of mid infrared(MIR)spectral attachments(attenuated total reflection MIR spectral attachment,transmission MIR spectral attachment and diffuse reflection MIR spectral attachment)and four types of spectral processing techniques(one-dimensional MIR spectroscopy,second-order derivative MIR spectroscopy,fourth-order derivative MIR spectroscopy and deconvolution MIR spectroscopy),respectively.It was found by the experiments that the attenuated total reflection MIR spectral attachment and transmission MIR spectral attachment could be better used to carry out the structural study of the amorphous phase of polytetrafluoroethylene among the three types of MIR spectral attachments,and the deconvolution MIR spectroscopy technique had better spectral resolution than the other three among the four types of spectral processing techniques.Further semi-quantitative research of the amorphous phase structure of polytetrafluoroethylene molecule was carried out,and it was speculated that the mass fraction of the amorphous phase in polytetrafluoroethylene molecule was approximated to be 5％.This study expanded the scope of MIR spectroscopy in the research of the amorphous phase structure of an important polymer material(polytetrafluoroethylene),which was of great value for applied research.
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