ISSN:
0032-3888
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Many plastic articles when exposed outdoors deteriorate first at points of highest stress. Consequently, weathering of polyolefins under stress speeds the deterioration and hence the evaluation of ultraviolet stabilizers used to retard it. Cracking of the stressed polyolefin specimens denotes failure and is a direct measure of the minimum useful outdoor lifetime of the materials, whereas in other methods the change in some property, such as elongation, is used to predict the useful lifetime. In this work, the results of nine years of natural and artificial weathering illustrate the usefulness of the stresscracking method for evaluating polyethylene and polypropylene compositions. The evaluation of compositions by this method was found to correlate with that made by measuring the loss of elongation during outdoor weathering.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pen.760050311
