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Fluoropolymer Films (fluoropolymer + film)

Distribution by Scientific Domains

Polymers and Materials Science	100%

Selected Abstracts

Nanoporous, Ultralow-Dielectric- Constant Fluoropolymer Films from Agglomerated and Crosslinked Hollow Nanospheres of Poly(pentafluorostyrene)- block -Poly(divinylbenzene)

ADVANCED MATERIALS, Issue 21 2005
G.-D. Fu
Nanoporous fluoropolymer films with dielectric constants below 2 are prepared via consecutive surface-initiated atom transfer radical polymerizations of pentafluorostyrene (PFS) and divinylbenzene (DVB) on silica nanospheres. After agglomeration of the nanospheres, crosslinking of the nanospheres by UV, and removal of the silica cores (see Figure), a nanoporous fluoropolymer film with a dielectric constant as low as 1.7 is formed. [source]

Radiation-grafted ion-exchange membranes: Influence of the initial matrix on the synthesis and structure

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 17 2001
Nadia Walsby
Abstract A series of commercial fluoropolymer films was irradiated with an electron beam, grafted with styrene, and sulfonated. The influence of the initial fluoropolymer on the grafting yields and the properties of the grafted and sulfonated membranes were investigated. The same synthesis procedure can be followed for most fluoropolymers and samples with a similar degree of grafting, and a homogenous polystyrene distribution can be prepared by varying the absorbed dose. The main difference among different fluoropolymer-based membranes is the water uptake from liquid water that has a roughly linear dependence on the crystallinity of the sample. The more amorphous the initial material, the greater the water uptake. Mechanical properties of the membranes at 50% relative humidity differ less than those of the starting materials and are comparable to those of Nafion® 105. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3008,3017, 2001 [source]