title: Detection of reversible nonlinear dynamic responses of polymer films by using time-resolved soft-pulse compression attenuated total reflection step-scan Fourier transform infrared spectroscopy.
abstract: An improved time-resolved soft-pulse dynamic compression attenuated total reflection (ATR) step-scan Fourier transform rheo-optical system has been developed. This system was used to observe reversible dynamic responses of poly(ethyleneterephthalate) (PET) and poly(p-phenylene biphenyltetracarboximide) (BPDA-PDA) films. In the case of PET, reversible nonlinear dynamic responses were observed in the C=O stretching vibration. The nonlinear responses decreased with decreasing compressive strain from 0.045 to 0.018. For the C-O stretching bands associated with the backbone structure of the PET, the nonlinear responses were very small. Characteristic burst-like reversible nonlinear dynamic responses can be seen in the in-phase and out-of-phase C=O stretching vibrations of cyclic imides, and phenyl ring deformation bands in the PDA parts of the BPDA-PDA. The results suggest the presence of inter-molecular interaction between C=O of cyclic imides and the phenyl ring groups of the PDA parts. The present method shows promise for characterizing a wide variety of polymeric materials, including polymer alloys, blends, composites, and copolymers and semicrystalline polymers.
authors.affiliation: Material Analysis Division, Material Technology R&D Laboratories, Konica Minolta Technology Center Inc., No.1 Sakura-machi, Hino-shi, Tokyo,191-8511, Japan. yuji.nishikawa@konicaminolta.jp
authors.forename: Yuji
authors.initials: Y
authors.lastname: Nishikawa
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Nakano
authors.forename: Isao
authors.initials: I
authors.lastname: Noda