Photo-oxidative degradation of poly(ethylene oxide)-copper chloride complexes

Add time:08/25/2019    Source:sciencedirect.com

Poly(ethylene oxide) (PEO) forms with CuCl2 a complex in acetonitrile (AN) solution as well as in solid phase (after evaporation of solvent). During u.v. or visible light irradiation it has been observed that a rapid photo-oxidative degradation of the PEO-CuCl2 complex in AN is caused by free Cl● and/or Cl●−2 radicals (formed from the photolysis of CuCl2). With increasing degradation processes, there is also a pronounced change in the morphology of PEO-CuCl2 complexes. They lose their capability to form spherulites. This results from changes in molecular weight and dispersity that affect crystallization conditions. Both wide angle X-ray spectroscopy and differential scanning calorimetry show that photodegraded PEO molecules are almost amorphous. Low-molecular fractions are formed as a result of chain scission processes. Photodegradation processes in AN solution do not cause crosslinking or formation of a gel fraction.

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