✦ LIBER ✦

Photooxidative degradation of styrenic polymers: 13C-NMR and morphological changes upon irradiation

✍ Scribed by A. Vishwa Prasad; R. P. Singh

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 439 KB
Volume: 70
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19981024)70:4<637::aid-app2>3.0.co;2-r

No coin nor oath required. For personal study only.

✦ Synopsis

Thin films of high impact polystyrene (HIPS 8350) and styrene-butadienestyrene triblock copolymers (SBS) were exposed to polychromatic light for different time intervals in SEPAP 12/24 at 55°C in atmospheric air. The photooxidized samples were analyzed by 13 C-NMR spectroscopy in the liquid state. Epoxides and alcohols were photoproducts in the SBS. Epoxides were not observed in the HIPS. The morphological changes of the solution cast HIPS and SBS films caused by irradiation were studied by scanning electron microscopy. The property deterioration was explained in terms of scission reactions in the HIPS and SBS matrix. The micrographs indicate that both materials are of a two phasic system.

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