Photoinduced depolymerization in poly(olefin sulfone) films comprised of volatile monomers doped with a photobase generator

Abstract

Photoinduced depolymerization of poly(olefin sulfone)s mixed with a photobase generating compound was investigated. Irradiation of 254 nm UV light to films comprising of a mixture of a photobase generating compound and poly(olefin sulfone)s with volatile monomers caused photoinduced depolymerization and the irradiated part of the film vaporized. The effect of the poly(olefin sulfone) structure on the photoinduced depolymerization process was investigated. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012

Tunable thermal degradation and refractive index of poly(norbornene sulfone)s via two different polymerization methods

“…The bicycle (2,2,1) heptane and cis ‐bicyclo (3,3,0) octane indicates absorptions in the 921 cm −1 region. The 1 H and C NMR chemical shift values of norbornene monomers were previously reported and their reactivity during polymerization was discussed in the literature . The electron‐donating characteristic of norbornene monomers is required for the process of the radical copolymerization with SO 2 , and is independent of the comonomer composition in the feed, because the comonomers have no reactivity for homopolymerization.…”

“…In addition, no 1 H NMR resonances are observed for cycloolefine hydrogens between 5 and 6.7 ppm. The C NMR spectra of poly(norbornene sulfone)s synthesized with radical initiator system present three groups of resonance. The peaks in the region of 24–28 ppm are nonbridging groups for C 5 and C 6 , the resonance present between 39 and 43 ppm represent a bridge group and bridgehead groups for C 1 , C 4 , and C 7 , and the resonance peaks between 64 and 67 ppm are backbone connecting groups for C 2 and C 3 .…”

“… (a) 1 H and (b) C NMR spectra of poly(norbornene sulfone). [Color figure can be viewed at http://wileyonlinelibrary.com]…”

“…In these reported studies, the copolymerization exhibited some obstacles, which hinder the industrial application of the copolymers. For example, the copolymerization is usually performed at −20 °C, and the obtained copolymers often are low‐molecular‐weight polysulfones …”

Photoinduced depolymerization of poly(olefin sulfone)s possessing photobase generator side‐chains: Effect of spacer‐chain length

“…The photoinduced depolymerization reaction of poly(olefin sulfone)s possessing a photobase generator (PBG) has been investigated . The poly(olefin sulfone) is a 1:1 alternating copolymer of an olefin monomer and sulfur dioxide .…”