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Quantum yield of solid state polymerization of diacetylenes

Authors
Journal
Journal of Photochemistry
0047-2670
Publisher
Elsevier
Publication Date
Volume
16
Issue
2
Identifiers
DOI: 10.1016/0047-2670(81)80022-6
Disciplines
  • Physics

Abstract

Abstract Chemical actinometry was used to make the first reliable determination of the quantum yield of the solid state polymerization of two diacetylenes RCCCCR, the first compound being 5,7-dodecadiyn-1,12-bis( n-butoxycarbonylmethylene urethane) (4BCMU) where R  (CH 2) 4-OCONHCH 2COO(CH 2) 3CH 3 and the second being 2,4-hexadiyn-1,6-bis( p-toluenesulfonate) (1 pTS) where . The number of monomer molecules polymerized on irradiation at 254 nm was determined by absorption spectroscopy. A quantum yield of above 50 was observed for 4BCMU while 1 pTS gave the much lower value of 0.06 ± 0.03. The lower quantum yield for 1 pTS is explained by the low molecular weight chains provided by polymerization.

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