Radiation effects on poly(1-chloro-1-alkynes)

✍ Scribed by Ben-Zhong Tang; Toshio Masuda; Toshinobu Higashimura; Hitoshi Yamaoka

• Book ID: 105338194
• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 584 KB
• Volume: 28
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/polb.1990.090280303

✦ Synopsis

Abstract

The γ‐radiolysis behavior of poly(l‐chloro‐1‐alkynes)
[
[\rlap{‐‐} ({\rm CCI} = {\rm CR}\rlap{‐‐} )_n ;{\rm R} = n ‐ {\rm alkyl}]
]
greatly changed with the length of alkyl group and with the presence or absence of oxygen. When γ‐irradiated in air, poly(l‐chloro‐1‐hexyne) (R = n‐C~4~H~9~) decomposed to oligomers; its G~s~ value was as large as 5.4. When irradiated in vacuum, this polymer partly gelled. In contrast, poly(l‐chloro‐1‐decyne) (R = n‐C~8~H~17~) partly gelled even by irradiation in air. A high‐dose irradiation of this polymer in vacuum resulted in the quantitative formation of a gel. The polymers irradiated in air contained carbonyl and hydroxyl groups, indicating the participation of oxidation reaction. Comparison with their thermolysis leads to a conclusion that these Cl‐containing polyacetylenes are radiation‐sensitive irrespective of their high thermal stability.