The monomer sequence CF2CF(CF3)CH2CF2CF2CF(CF3) has been identified by 19F NMR as the selectively base-sensitive site of poly(viny1idene fluoridefiexafluoropropylene). Similar studies of other vinylidene fluoride (VF2) copolymers with either tetrafluoroethylene (TFE) or perfluoro(methy1 vinyl ether) (PMVE) show that the generalized base-sensitive site of VF2 copolymers which contain one or more perfluorinated monomers can be formulated as:A B
The article contains sections titled: 1. Introduction 2. Fluoroplastics 2.1. Introduction 2.2. Polytetrafluoroethylene 2.2.1. Production 2.2.2. Properties 2.2.3. Processing 2.2.4. Uses 2.3. Tetrafluoroethylene‐Hexafluoropropylene Copolymers 2.3.1. Production 2.3.2. Properties 2.3.3. Processing 2.3.4. Uses 2.4. Tetrafluoroethylene‐Perfluoro‐(Propyl Vinyl Ether) Copolymers 2.4.1. Production 2.4.2. Properties 2.4.3. Processing 2.4.4. Uses 2.5. Tetrafluoroethylene‐Ethylene Copolymers 2.5.1. Production 2.5.2. Properties 2.5.3. Processing 2.5.4. Uses 2.6. Polychlorotrifluoroethylene 2.6.1. Production 2.6.2. Properties 2.6.3. Processing 2.6.4. Uses 2.7. Chlorotrifluoroethylene‐Ethylene Copolymers 2.7.1. Production 2.7.2. Properties 2.7.3. Processing 2.7.4. Uses 2.8. Poly(Vinylidene Fluoride) 2.8.1. Production 2.8.2. Properties 2.8.3. Processing 2.8.4. Uses 2.9. Poly(Vinyl Fluoride) 2.9.1. Production 2.9.2. Properties 2.9.3. Processing 2.9.4. Uses 3. Fluoroelastomers 3.1. Introduction 3.2. Elastomers Based on Vinylidene Fluoride 3.2.1. Production 3.2.2. Properties 3.2.3. Processing 3.2.4. Uses 3.3. Elastomers Based on Tetrafluoroethylene‐Perfluoro(Methyl Vinyl Ether) Copolymers 3.3.1. Production 3.3.2. Properties 3.3.3. Processing and Uses 3.4. Elastomers Based on Tetrafluoroethylene‐Propylene Copolymers 3.4.1. Production 3.4.2. Properties 3.4.3. Processing 3.4.4. Uses 4. Toxicology and Occupational Health 4.1. Fluoroplastics 4.2. Fluoroelastomers 5. Economic Aspects
The photodimerization and fluorescence quantum yields of 9-anthroic acid in ethanol and benzonitrile and sodium 9-anthroate in water, deuterium oxide, and benzonitrile were measured at 365 nm as a function of concentration. These efficiencies when coupled with fluorescence lifetime measurements are used to evaluate various mechanistic schemes and to determine the rate constants for the individual steps in the simplest mechanistic scheme that is consistent with our kinetic data.
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