Topic
Polyvinyl fluoride
About: Polyvinyl fluoride is a research topic. Over the lifetime, 331 publications have been published within this topic receiving 2477 citations. The topic is also known as: poly(vinyl fluoride).
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TL;DR: In this article, the authors describe and evaluate the aging mechanisms in multi-layer films that are used for encapsulation of photovoltaic (PV) cells, including polyethylene terephthalate (PET), polyvinyl fluoride (pVF), and polyvinylonidene fluoride (polyvinylidene fluoride).
136 citations
TL;DR: In this paper, Teflon and tetrafluoroethylene photopolymers, on pyrolysis in a vacuum at 423.5° to 513.0° C, yield almost 100 percent of monomer.
Abstract: Teflon and tetrafluoroethylene photopolymers, on pyrolysis in a vacuum at 423.5° to 513.0° C, yield almost 100 percent of monomer. The rate of formation of monomer at any given temperature follows a first-order reaction and is independent of the method of preparation of polymer or its initial average molecular weight. The activation energy was determined by a pressure method and a weight method, and a value of 80.5 kcal was found by both methods. A preliminary heating of Teflon in air at 400° to 470° C did not change appreciably its rate of degradation into monomer when it was subsequently heated in a vacuum. Polyvinyl fluoride, 1, 1-polyvinylidene fluoride, and polytrifluoroethylene were pyrolized in the range 372° to 500° C. The volatiles consisted in all cases of HF and a wax-like material consisting of chain fragments of low volatility. Polyvinyl fluoride and polytrifluoroethylene degrade to complete volatilization, whereas 1,1-polyvinylidene fluoride becomes stabilized at about 70-percent loss of weight. The rate-of-volatilization curves indicate a first-order reaction for polyvinyl fluoride, a zero-order reaction for trifluoroethylene, and an undetermined order for 1, 1-polyvinylidene fluoride. The order of thermal stability for these polymers, as compared with polymethylene, is as follows: Polyvinyl fluorideE46polymethyleneE46polytrifluoroethyleneE461,1-poly vinylidene fluorideE46polytetrafluoroethylene.
79 citations
TL;DR: In this article, the polycrystalline silicon type photovoltaic modules were treated with a physical and a chemical process, where the physical process was aimed at the recovery of glass, metals, and the polyvinyl fluoride film.
79 citations
TL;DR: All the surfaces became more hydrophilic after plasma treatment, owing to the grafting of polar nitrogen or oxygen functions and the kinetics of defluorination and grafting seems to be favoured for PVDF and PVF surfaces.
Abstract: Poly tetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF) polymer surfaces were exposed to a remote N2 or O2 r.f. plasma. The effect of the plasma power and treatment time on the surface energy and the surface composition were studied by static water contact angle (WCA) and X-ray photoelectron spectroscopy (XPS). In every case, a strong defluorination of the surface was observed. Except for PTFE treated by oxygen, all the surfaces became more hydrophilic after plasma treatment, owing to the grafting of polar nitrogen or oxygen functions. The kinetics of defluorination and grafting seems to be favoured for PVDF and PVF surfaces. Copyright © 2006 John Wiley & Sons, Ltd.
73 citations
TL;DR: In this article, the authors focused on the description and evaluation of the delamination behavior of multi-layer films, which are used for encapsulation of photovoltaic (PV) cells.
67 citations