Fluoroelastomer Monomers

Moore, Albert L.

doi:10.1016/b978-081551517-3.50006-x

Cited by 8 publications

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References 26 publications

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“…Despite the technical importance of poly(vinylidene fluoride) (PVDF), reliable individual rate coefficients are not yet available for vinylidene fluoride (VDF) homopolymerizations. VDF homo- and copolymers exhibit outstanding properties, such as excellent thermal, chemical, and mechanical stability, excellent weatherability, low surface energy, low water absorptivity, and low flammability. , Thus, fluoropolymers are present in many technical applications, e.g., in architecture, petrochemical, and automotive industries, aerospace and aeronautics, optics, and textile treatment . Furthermore, due to their biocompatibility they are attractive materials for medical devices like in reconstructive surgery. , In addition, PVDF showing β phase crystallinity possesses piezoelectric and pyroelectric properties leading to applications in, e.g., transducers, sensors, and switches. ,− …”

Section: Introductionmentioning

confidence: 99%

Propagation Rate Coefficients for Vinylidene Fluoride Homopolymerizations

2013

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For the first time individual propagation rate coefficients, k p, for the homopolymerization of vinylidene fluoride (VDF) have been determined in homogeneous phase reactions with supercritical carbon dioxide. Experiments combining pulsed laser initiation and polymer analysis by size-exclusion chromatography were carried out for temperatures up to 90 °C and pressures up to 1100 bar. Absolute polymer molar masses required for the determination of k p were calculated on the basis of experimentally derived Mark–Houwink constants. A general equation k p(VDF) = f(p,T) was derived by applying multiple regression analysis of k p data. All data may be expressed by ln[k p/(L·mol–1·s–1)] = 19.96 – 3633 K/T + 0.27 p/bar × T –1/K–1. Due to the fluorine atoms in the monomer the kinetic data is significantly different from the nonfluorinated structural analogue ethene. For example, at 60 °C and 1000 bar VDF k p is 19400 L·mol–1·s–1, while k p for ethene is by a factor of 200 lower.

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