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Time-resolved orientation detection system with quantum cascade lasers.

Ke Ye1, Xiaowei Chen1, Wenwen Zhang1

  • 1National Synchrotron Radiation Lab, CAS Key Laboratory of Soft Matter Chemistry, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, University of Science and Technology of China, Hefei 230026, China.

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|August 3, 2018
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Summary
This summary is machine-generated.

A new system using quantum cascade lasers (QCLs) and a photoelastic modulator (PEM) enables rapid polymer orientation detection in 20 µs. This breakthrough allows real-time monitoring of polymer chain alignment during stretching processes.

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Area of Science:

  • Spectroscopy
  • Polymer Science
  • Materials Science

Background:

  • Real-time monitoring of polymer chain orientation is crucial for understanding material properties.
  • Existing methods often lack the necessary speed for dynamic processes like film stretching.

Purpose of the Study:

  • To develop and validate a novel system for rapid detection of polymer chain orientation.
  • To achieve high time resolution for in-situ analysis of polymer deformation.

Main Methods:

  • Integration of quantum cascade lasers (QCLs) with a photoelastic modulator (PEM) for infrared dichroism measurements.
  • Development of a high-speed data acquisition system with precise trigger signal synchronization (5 ns resolution).
  • Application of the system to monitor the biaxial stretching of β-polypropylene (PP) films.

Main Results:

  • The developed system achieved a time resolution of approximately 20 µs.
  • Observed orientation factor changes in β-PP films from 0.04 to 0.36 during machine stretching and to 0 during transverse stretching.
  • Results correlated well with Fourier-transform infrared spectroscopy (FTIR) estimations.

Conclusions:

  • The QCL-PEM system demonstrates high feasibility for rapid polymer orientation detection.
  • The system provides a significant advancement in real-time monitoring of polymer dynamics.
  • This technology opens new avenues for in-situ characterization of materials under stress.