Dynamic rheo-optical characterization of uniaxially oriented polyamide 11

Wang, Yanxiang; Lehmann, Stephan

doi:10.1002/(sici)1099-0488(19981130)36:16<2895::aid-polb4>3.0.co;2-e

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…A study of the submolecular motional behavior of uniaxially oriented polyamide 11 observed that the dynamic spectra depended upon the thermal treatment of the sample (38). Overlapping bands were resolved, and the hydrogen-bonded regions were more sensitive to the applied perturbation.…”

Section: Two-dimensional Correlation Spectroscopymentioning

confidence: 99%

Infrared Spectroscopy

2000

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This review on infrared spectroscopy highlights three areas in which infrared spectroscopy has become increasingly important during the last two years. These areas are two-dimensional infrared (2D IR) spectroscopy, combinatorial chemistry, and human health. This trend is quite evident in the abstracts examined in preparation for this article. No review article is complete without also including some discussion of the current developments in instrumentation. The review is focused on articles published during 1998 and 1999, but occasionally will include articles from earlier work if they provided additional information we thought pertinent. There is a wealth of other very interesting work that has been published and we encourage the reader to pursue them. As the reader follows the article, they should find that each area discussed impacts another area, which shows that the science of infrared spectroscopy is very exciting indeed.

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Section: Two-dimensional Correlation Spectroscopymentioning

confidence: 99%

Infrared Spectroscopy

2000

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“…In addition to the original incorporation of the novel data processing into the step-scan FT-IR spectrometer with the use of the DSP board by Manning and Grif® ths in 1993, 16 a software-based DSP was recently developed mainly for depth pro® ling photoacoustic spectroscopy with phase m odulation. 17±19 Although the DSP m ethod has high potential to be applied for infrared rheo-optical spectroscopy, only a few measurem ents with step-scan 11,16 and rapid-scan 10 FT-IR spectrometers combined with the hardware-based DSP have been reported so far. In the present study, recently developed step-scan FT-IR spectroscopy combined with the software-based DSP was applied for infrared rheooptics of polymeric m aterials.…”

Section: Introductionmentioning

confidence: 99%

Infrared Rheo-Optics of Bombyx Mori Fibroin Film by Dynamic Step-Scan FT-IR Spectroscopy Combined with Digital Signal Processing

Sonoyama

Nakano

2000

Appl Spectrosc

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Recently developed dynamic step-scan FT-IR spectroscopy combined with software-based digital signal processing (DSP) was applied for infrared rheo-optical measurements of isotactic polypropylene and regenerated Bombyx mori silk fibroin film undergoing sinusoidal mechanical strain. Comparative measurements of dynamic infrared spectra of polypropylene film using the DSP-based method and two lock-in amplifiers (LIAs) indicated that a high signal-to-noise ratio (SNR) advantage is attained by the DSP method compared with the LIA method. With the DSP technique, dynamic spectra of Bombyx mori silk fibroin film with high SNR were successfully recorded in the whole mid-infrared region in only 30 min. The dynamic spectra revealed that stress-induced dynamic reorientation in fibroin film is mainly localized in the segment with β-sheet conformation and is almost synchronous with the applied mechanical strain. Two-dimensional (2D) correlation analyses of the dynamic spectra showed that (1) the broad amide I band is resolved into three components whose positions are dependent on secondary structures, (2) the dynamic behavior of tyrosine residues was extracted by separation of the feature due to its aromatic side chains from the broad envelope of the amide I band in the 2D asynchronous map, and (3) the dynamic behavior of the amide A and B modes is the same as that of the amide II mode, when the mechanical strain is applied to fibroin film.

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