Polyvinylpyridine-divinylbenzene and asbestos composites

Modica, G.; Giuffré, L.; Montoneri, Enzo; Wendt, Hartmut; Hofmann, H.

doi:10.1016/0032-3861(84)90119-8

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…DVB has been controllably and quantifiably incorporated into a PDVB homopolymer and a copolymer with 4-vinylpyridine (P(4VP- co -DVB)). P(4VP- co -DVB) is a common industrial polymer, most notably used as an ion-exchange resin, and is significant for its insolublity, infusibility, and thermal and chemical stability in a variety of harsh solvents . Tuning of material properties is demonstrated by observing the effect of changes in the degree of cross-linking on the elastic modulus of the copolymer.…”

Section: Introductionmentioning

confidence: 99%

Controllable Cross-Linking of Vapor-Deposited Polymer Thin Films and Impact on Material Properties

2013

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We report the single-step preparation of controllably cross-linked poly(divinylbenzene) (PDVB) and poly(4-vinylpyridine-co-divinylbenzene) thin films using initiated chemical vapor deposition (iCVD). Fourier transform infrared spectroscopy-based methods for quantifying film composition and degree of cross-linking are elucidated; the validity of these methods is assessed using X-ray photoelectron spectroscopy and nanoindentation. The extent of reaction of divinylbenzene (DVB) pendant vinyl bonds in homo- and copolymer films is unaffected by changes in initiator concentration, suggesting that bond reactivity, rather than radical concentration, is the limiting factor. Analysis of film step coverage (S) over high aspect ratio (AR) features and sticking probability calculations lend insight into the reactivity of both monomers and explain the extreme conformality of PDVB films (S = 0.87 ± 0.02 at AR = 4.7). In addition, the incorporation and cross-linking of DVB moieties in the copolymer are extremely reproducible and can be used to tune the elastic moduli of the films from 3.4 to 5.8 GPa.

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Section: Introductionmentioning

confidence: 99%

Controllable Cross-Linking of Vapor-Deposited Polymer Thin Films and Impact on Material Properties

2013

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“…Table 1 also shows that the concentration distribution of PPS throughout a given solid phase is rather non homogeneous: the surface concentration (PPS.,f) is consistently higher than the bulk concentration (PPS,f). Scanning electron microscopy [4] indicates that the surface of the composite cardboards acquires the morphology of a non porous membrane due to the high PPS~j concentration, whereas the bulk phase with lower concentration of organic polymer reveals compact areas separated by deep void channels [8]. Under these circumstances the liquid must first penetrate the lipophilous surface barrier by means of chemical solvation into the surface PPS phase in order to reach the bulk phase and fill up the internal void volume.…”

Section: Resultsmentioning

confidence: 99%

“…Also the bulk phase appears more porous than initially and similar to that of other composites aged under the same conditions [8]. Under these circumstances there is no need of chemical solvation into the surface phase for the liquid to penetrate into the bulk phase and the amount of physically trapped liquid into the void volume of the composite far overrides that held by chemical interactions between the solid phase and the liquid permeant.…”

Section: Liquid Regain Of Aged Compositesmentioning

confidence: 94%

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Polyphenylene Sulfide-Asbestos-Brucite Composites. Part II*: Properties and Performance in Advanced Water Electrolysis

Montoneri

Ranzi

Modica

et al. 1987

Journal of Composite Materials

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Commercial crysotyle asbestos cardboard of 0.055 cm thickness and 0.44 V/w water regain volume per unit cardboard weight is a stable separator for advanced water electrolysis when coated with polyphenylene sulfide. The electrical resistance at the minimum 29% w/w coating level to guarantee separator stability has been found high (0.92 Π • cm 2 ). Composite materials over a wide range of compositions have been further investigated by means of stepwise multivariable regression analysis and the relationships between chemical composition, morphology, water wettability and electrical resistance have been sought. The results indicate that a model composite fabricated from a more porous matrix should attain acceptable electrical resistance (≤ 0.25 Π • cm 2 ) even at the minimum PPS load which is required to maintain material stability.

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“…This improvement was attributed to the formation of a thin polymeric layer around each cement grain, restricting the propagation of microcracks. In a similar study [24], an attempt was made to modify chrysotile asbestos cardboards through the in situ copolymerization of vinylpyridine and divinylbenzene.…”

Section: Introductionmentioning

confidence: 99%

The effect of fiber coating on the tensile properties of ionomer‐based composites

Papaspyrides

Poulakis

1992

Polymers for Advanced Techs

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Asbestos fibers, of the chrysotile variety, were coated with a thin polyamide film by an in situ polycondensation technique. lonomer-based composites were prepared containing the so-modified asbestos fibers in a random in-plane orientation; results of testing the tensile properties of these asbestoslpolyamidelionomer composites are presented. Parameters investigated comprise the asbestos content in the composite and the polyamide content deposited on asbestos. A significant improvement in the tensile performance was established, especially at the intermediate polyamide content of 3.4 phr. The behavior is discussed in terms of possible interactions between the phases present in the composite material.

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Polyvinylpyridine-divinylbenzene and asbestos composites

Cited by 14 publications

References 4 publications

Controllable Cross-Linking of Vapor-Deposited Polymer Thin Films and Impact on Material Properties

Controllable Cross-Linking of Vapor-Deposited Polymer Thin Films and Impact on Material Properties

Polyphenylene Sulfide-Asbestos-Brucite Composites. Part II*: Properties and Performance in Advanced Water Electrolysis

The effect of fiber coating on the tensile properties of ionomer‐based composites

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