𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Co-photolysis of poly(styrene) and poly(vinylacetophenone)—I. Vacuum photolysis

✍ Scribed by N.A. Weir; M. Rujimethabhas; P.Q. Clothier

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
521 KB
Volume
17
Category
Article
ISSN
0014-3057

No coin nor oath required. For personal study only.

✦ Synopsis

Films made from blends of poly(st)rene) (PSI and pob(vinylacetophcnone) (PVAP) {up to 12% mol PVAP) were exposed undcr high vacuum to long wave u.v. radiation 12 > 300nm). Spectral changes {phosphorescence, NMR and i.r. indicated that PVAP was photolysed: the nature of gaseous products (in order of abundance, methane, carbon monoxide, ethane and acetaldehyde) confirmed that PVAP was undergoing a Norrish Type I decomposition. There was also evidence of photoreduction, OH absorptions appearing in the i.r. The blended films undergo cross-linking but the insoluble material formed after about 10hr contains little carbon)l. The effects of PVPA concentration and molecular weight on the rate of product formation were also investigated. Experiments with poly(~-D-styrcne) confirmed that methyl radicals were abstracting H atoms at the >position in PS. The implications of such reactions in the initiation of photo-oxidation by polymeric ketonic species are discussed.

📜 SIMILAR VOLUMES

Co-photolysis of polystyrene hydroperoxi
Co-photolysis of polystyrene hydroperoxide with poly(vinylacetophenone)
✍ Neil A. Weir; J. Arct; J.K. Lee 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 469 KB

Films made from poly(styrene) hydroperoxide (PSOOH) and poly(vinylacetophenone) (PVAP) were exposed to long-wave (2/> 300 nm) u.v. radiation under high vacuum at 25 + I °. The presence of PVAP considerably enhanced the rate of decomposition of PSOOH, the quantum yield increasing by a factor of 2.5.

Reactions of methyl radicals with poly(v
Reactions of methyl radicals with poly(vinylacetophenone) during photolysis
✍ N.A. Weir; J. Arct 📂 Article 📅 1987 🏛 Elsevier Science 🌐 English ⚖ 286 KB

The photochemistry of isotopically labelled poly(vinylacetophenone) (PVAP) has been investigated, with a view to determining the point of H-atom abstraction from the polymer. Poly(ct-Dvinylacetophenone) (DPVAP) and poly [3.[3 dideuterovinyl(acetophenone) (D2PVAP) were irradiated under high vacuum wi

Photolysis of poly(p-isopropyl styrene)
Photolysis of poly(p-isopropyl styrene)
✍ N.A. Weir; T.H. Milkie 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 412 KB

The photodegradation of films of poly(pisopropyl styrene) with 254nm radiation at 10 -~ mbar and 25 + I ° has been studied. The principal product is hydrogen but smaller quantities of methane and ethane and a trace of propane are also formed, indicating that the p-substituent also undergoes decompos