Degradation of crosslinked resins in water and electrolyte solutions

Abeysinghe, H.P.; Edwards, Walter M.; Pritchard, Geoffrey; Swampillai, G.J.

doi:10.1016/0032-3861(82)90123-9

Cited by 77 publications

(50 citation statements)

References 10 publications

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“…This weight loss phenomenon was also observed for other different polymeric systems and reported by several authors 2,[4][5][6][7][8][9][10][11][12] . In the work of Fraga et al 4 , weight loss was not observed in the curve of weight change, but the presence of voids detected after immersion and an analysis by FTIR pointed out the extraction of low molecular weight molecules.…”

Section: Hygrothermal Ageingsupporting

confidence: 84%

“…Exposure to water also changes glass transition temperature and may lead to extraction of short chain molecules, affecting flexural modulus 4,6 . Other phenomena such as swelling and leaching of non-bounded substances have been also observed 5,6 . Most published data on cast resins studied ageing mechanisms without correlating degradation to mechanical properties.…”

Section: Introductionmentioning

confidence: 90%

“…In the work of Fraga et al 4 , weight loss was not observed in the curve of weight change, but the presence of voids detected after immersion and an analysis by FTIR pointed out the extraction of low molecular weight molecules. According to Abeyshinghe et al 5 , the weight loss mechanism can be accounted to diffusion of residual volatile, chemical scission of the ester groups mainly for polyester resins, or hydrolysis and diffusion of residues induced by cracks and leaching. The observation of cracks and leaching in the present work will be discussed later on.…”

Section: Hygrothermal Ageingmentioning

confidence: 99%

“…For all these reasons they are suitable for using as matrix of polymeric composites 3 . The effect of water absorption on resins used as matrixes for composite applications, including the vinyl ester, has been studied by several authors 2,4,5 . All of them have observed damaging effects and the nature of damage itself, whose degree and intensity depend on the type of resin, temperature, type and amount of initiator, post-cure treatment, among others, what turns the evaluation very complex, since processing and environment plays a crucial role on how resistant the polymeric material will be.…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown that weight loss during to exposure to water is affected by type and amount of initiator, the post-curing treatment, relative humidity and temperature 2,[4][5][6] . Post-curing treatment reduces weight loss significantly while higher temperatures and relative humidity increases the weight loss rate.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The effects of water absorption on an ester vinyl resin system

Sobrinho¹,

Ferreira²,

Bastian³

2009

Mat. Res.

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Derakene is a vinyl ester resin largely employed as matrix for polymeric based composite systems. In this work, the performance of such polymeric system was evaluated considering the effect of hygrothermal aging. The mechanical and thermal properties were examined for the processed material before and after ageing in water at 60 °C for a maximum period of 64 days. Both analyses indicated the occurrence of post cure of the system after 16 days due to exposition at 60 °C in water, which was also confirmed by analyses in samples with post cure treatment. Moreover, it was observed plasticizing of resin after 36 and 64 days of ageing. Micro structural and fracture surface analyses were carried out in order to characterize the samples. The appearance of surface voids was also observed.

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Section: Hygrothermal Ageingsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 90%

Section: Hygrothermal Ageingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The effects of water absorption on an ester vinyl resin system

Sobrinho¹,

Ferreira²,

Bastian³

2009

Mat. Res.

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Study of unsaturated polyester and vinylester morphologies using excimer laser surface treatment

Mortaigne

Feltz

Laurens

1997

J. Appl. Polym. Sci.

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ABSTRACT:A technique based on the use of an ArF excimer laser (193 nm) to analyze the morphology of the unsaturated polyester and vinylester networks has been developed. This method is based on the use of the differences between the thresholds at which ablation of the various constituent phases of the materials occurs.After having determined the ablation threshold of a polystyrene, various surface treatments using excimer lasers fluence around this threshold were applied to unsaturated polyesters and vinylester. In the latter case, a two-phase structure consisting of microgels in a polystyrene phase was shown by scanning electron microscopy observations, allowing us to conclude that the mechanisms by which vinylester and unsaturated polyester networks are formed are similar. We also observed that the two-phase structure of the vinylester matrixes, unlike that of the unsaturated polyesters, is organized rather than random-structured, which could represent a major parameter contributing to the very good hydrolysis stability of these materials. In the event of degradation by osmotic mechanisms, the organized structure network would enable limiting of the development of the osmotic pressures by distributing the forces within the material, thus avoiding crazing.

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Degradation of polyester film in alkali solution

Raghavan

Egwim

2000

J. Appl. Polym. Sci.

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In recent years there has been a remarkable growth in coatings technology, yet polymer‐coated metals still corrode when they are exposed to severe environments. If the effectiveness of polymer coatings is to be increased, it is essential to understand the microstructure of polymer coating film and the changes that occur to the film upon environmental exposure, and relate the changes to the protective performance of coatings. The degradation of a polyester immersed in alkali solution has been investigated using a number of analytical techniques including atomic force microscopy (AFM), liquid chromatography/mass spectrometry (LC/MS), and Fourier transform infrared spectroscopy (FTIR). AFM was used to characterize the heterogeneous phase in the unexposed films and films exposed to alkali solution. Film roughness was found to increase with aging of the film in alkali medium. Total organic carbon analysis of the leached aqueous medium showed the presence of organic compounds, suggesting a chemical degradation of the film in alkali medium. FTIR analysis of the leached medium showed evidence for the formation of carboxylate species upon degradation of polyester film in alkali solution, while LC/MS analysis of the leached medium confirmed the presence of isophthalic acid and sodium isophthalate. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2454–2463, 2000

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Degradation of crosslinked resins in water and electrolyte solutions

Cited by 77 publications

References 10 publications

The effects of water absorption on an ester vinyl resin system

The effects of water absorption on an ester vinyl resin system

Study of unsaturated polyester and vinylester morphologies using excimer laser surface treatment

Degradation of polyester film in alkali solution

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