Die Angewandte Makromolekulare Chemie · 1996 · 16 citations · 2 references
Natural SciencesChemistryCatalysisOrganic ChemistryPolymer ChemistryPhotocatalysisPhotochemical SynthesisPhotochemistryPolymer AnalysisPolymer SynthesisPolymerization ChemistryAldehydesCyclic PolymersPhotocatalytic SynthesisVapor Pressure Osmometry
Abstract The proton‐catalyzed polycondensation of aromatic aldehydes with aliphatic and aromatic α,ω‐dithiols leads to polymercaptals. The reaction may be carried out in bulk or solution. The bulk polycondensation was catalyzed by hexafluorophosphorous acid (HPF 6 ), formed photochemically by irradiation of the samples containing diaryliodonium salt. The polymers were obtained in high yields but with low molecular weights of M n 2300–5700 determined by vapour pressure osmometry (VPO). High‐molecular‐weight products of M n 9100–24000 (VPO) were obtained by solution polycondensation in dichloromethane catalyzed by p‐toluenesulfonic acid. The polymers have been characterized by NMR, VPO, GPC and TGA. Cyclic side products have been isolated and identified. Polyrotaxane structures were found under special conditions.
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