AN APPARATUS FOR INSTANTANEOUSLY MEASURING U.V., VISIBLE OR INFRARED DICHROISM FROM THIN POLYMER FILMS DURING HIGH SPEED STRETCHING.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1969
- Accession Number
- AD0696559
Entities
People
- Daniel A. Keedy
- Garth L. Wilkes
- Richard S. Stein
Organizations
- University of Massachusetts Amherst