Accession Number : AD0696559

Title :   AN APPARATUS FOR INSTANTANEOUSLY MEASURING U.V., VISIBLE OR INFRARED DICHROISM FROM THIN POLYMER FILMS DURING HIGH SPEED STRETCHING.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS UNIV AMHERST POLYMER RESEARCH INST

Personal Author(s) : Wilkes,Garth L. ; Keedy,Daniel A. ; Stein,Richard S.

Report Date : JUN 1969

Pagination or Media Count : 25

Abstract : An apparatus has been constructed for following changes in the dichroism of a polymer film undergoing rapid elongation. By means of a rapidly rotating mirror with evenly spaced open sectors, a beam of radiation is passed through the sample and then alternately polarized in the horizontal and vertical direction so that the horizontal and vertical absorbancies may be rapidly compared in times short as compared with the time of sample elongation (a few milliseconds). The apparatus utilizes reflection optics and a grating monochrometer so that measurements may be made using ultraviolet, visible, or infrared radiation. The transmitted intensity is detected by a photomultiplier or semiconductor cell, the output of which is amplified and displayed on an oscilloscope. A temperature controlled sample chamber is provided. The operation of the apparatus is illustrated by following the change in dichroism of a sample of dehydrohalogenated polyvinyl chloride with visible radiation during rapid extension. (Author)

Descriptors :   (*FILMS, *PHOTOELASTICITY), (*SPECTROMETERS, PHOTOELASTICITY), SPECTROMETERS, NONDESTRUCTIVE TESTING, POLYVINYL CHLORIDE, INFRARED SPECTROSCOPY, ULTRAVIOLET SPECTROSCOPY

Subject Categories : Plastics
      Test Facilities, Equipment and Methods
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE