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A study of the properties and topological trapping of cyclic poly(dimethylsiloxane) in poly(2,6-dimethyl-1,4-phenylene oxide) networks

✍ Scribed by W. Huang; H. L. Frisch; Y. Hua; J. A. Semlyen

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
464 KB
Volume
28
Category
Article
ISSN
0887-624X

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✦ Synopsis

Abstract

Polymeric catenanes have been made from poly(2,6‐dimethyl‐1,4‐phenylene oxide) crosslinked in the presence of several, paucidisperse poly(dimethylsiloxane) cyclics of varying degrees of polymerization. The fraction of cyclic threaded or captured by the polymer network increases as the degree polymerization of the cyclic increases in good agreement with the crude estimates of Frisch and Wasserman. Thermal analysis and electron micrographs reveal microphone separation in all of the polymeric catenanes; with PDMS domain size around 10–50 ΞΌ. Most of the catenanes exhibit a lower tensile strength to break than the pure crosslinked PPO.

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Poly(2,6-dimethyl-1,4 -phenylene oxide) (PPO) is a chemically resistant polymer and, therefore, an attractive material for the formation of membranes. However, membranes of unmodified PPO prepared by an immersion precipitation possess very low hydraulic permeabilities at the filtration processes. T