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Determination of orientational states in impact‐polystyrene specimens by near‐infrared polarization spectroscopy
Author(s) -
Schade C.,
Heckmann W.,
Borchert S.,
Siesler H.W.
Publication year - 2006
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20473
Subject(s) - dichroic glass , materials science , opacity , polystyrene , polarization (electrochemistry) , anisotropy , spectroscopy , optics , infrared , infrared spectroscopy , spectral line , optoelectronics , composite material , polymer , chemistry , physics , organic chemistry , quantum mechanics , astronomy
To measure the orientational state of opaque high‐impact polystyrene (HIPS) samples, the dichroic ratios of different absorption bands have been determined in the near‐infrared (NIR) transmission spectra measured with polarized radiation. For injection molded plates, dichroic ratios close to one were observed, indicating very low orientation effects in these specimens. However, a larger anisotropy was detected in the thermoformed cups and additionally different processing conditions could be discriminated by the dichroic effects in the NIR polarization spectra. Thus, NIR transmission spectroscopy with polarized radiation proved to be a convenient and rapid tool to determine orientation phenomena in HIPS samples and may also be implemented as a light‐fiber‐coupled on‐line process control technique. POLYM. ENG. SCI. 46:381–383, 2006. © 2006 Society of Plastics Engineers