Analysis of Molecular Interactions in Polymer Systems by Using a Pulsed Compression ATR Dynamic Infrared Linear Dichroism Step Scan Time Resolved FT-IR/2D-IR-Generation of Ring Down Compression Pulses-

作者：Nihikawa Yuji^*; Itoh Hiroto; Noda Isao

来源：Kobunshi Ronbunshu, 2015, 72(8): 505-512.

DOI：10.1295/koron.2015-0005

• Step-Scan Time-Resolved ATR FT-IR Spectroscopy
• Inertial Voigt Model
• Ring Down Pulse Compression
• Rheo-Optics
• Two-Dimensional Infrared Spectroscopy

Our unique rheo-optical method, based on pulsed compression ATR dynamic infrared linear dichroism (DDRLD) step scan time-resolved-FT-IR, coupled with 2D-IR spectroscopy, is further improved. By inserting a tungsten-carbide block weight with high mass and hardness between the film sample and the piezo electric multilayer actuator, a ring-down response was generated due to the inertial effect. As a result, it became possible to generate the multiplexed compression stress, which has a broad frequency distribution due to the viscoelasticity characteristics of polymer films. The molecular interactions of a polyethylene terephthalate (PET) film are analyzed by using this technique. The frequency response was distributed around 3.8 kHz for the amorphous PET, while for the crystallized PET, it was distributed around the higher frequency of 5 kHz. Differences are also found for the compression response phase revealed by using Fourier frequencies based 2D-IR. The present method provides us a powerful way to visualize the differences in dynamic molecular interactions of polymer systems.

• 出版日期2015