Study of impulse polymer rheo-optics by step-scan FT-IR time-resolved spectroscopy

被引:31
作者
Wang, HC
Palmer, RA
Manning, CJ
机构
[1] DUKE UNIV,DEPT CHEM,DURHAM,NC 27708
[2] MANNING APPL TECHNOL,MOSCOW,ID 83843
关键词
time-resolved infrared spectroscopy; step-scan FT-IR; polymer rheo-optics; polymer rheology; impulse polymer stretching; isotactic polypropylene (iPP);
D O I
10.1366/0003702971941827
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The applicability of step-scan impulse/response FT-IR spectroscopy to the rheo-optical study of polymer films is demonstrated by spectral measurements with isotactic polypropylene. A novel piezoelectrically driven microrheometer is employed to apply repetitive impulses to a polymer sample while time-domain spectra are recorded by step-scan FT-IR spectroscopy, The traditional advantages of Fourier transform spectroscopy are retained while providing a second multiplex advantage for the characterization of the time-dependence of the sample response, Reproducible results, consistent with the frequency-domain literature data and having good signal-to-noise ratio, are obtained. The spectral changes due to molecular reorientation are found to be essentially as fast as the mechanical stretching, also consistent with frequency-domain results. To our knowledge, this is the first reported step-scan FT-IR time-domain rheo-optical measurement. This technique appears to be applicable to a variety of polymer samples, The advantages of time-domain measurements over frequency-domain measurements are briefly discussed.
引用
收藏
页码:1245 / 1250
页数:6
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