Characterization of unsaturated polyester resin cured with styrene

Delahaye, N.; Marais, Stéphane; Saiter, Jean Marc; Métayer, M. Le

doi:10.1002/(sici)1097-4628(19980124)67:4<695::aid-app12>3.0.co;2-r

Cited by 19 publications

(10 citation statements)

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“…Voids in the polyester resin are very common and difficult to eliminate since most of them are caused by the volatilization of styrene throughout the cross-linking process. 16 Thus, SBS of the polyester resin is generally lower than that of other thermoset resins like epoxy. 17 The SBS primarily depends on the matrix properties and the fiber/matrix interfacial strength rather than the fiber properties.…”

Section: Resultsmentioning

confidence: 99%

Short beam strength of curaua, sisal, glass and hybrid composites

Silva

Júnior

Angrizani

et al. 2012

Journal of Reinforced Plastics and Composites

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In this study, the short beam strength characteristics of randomly oriented composites were comprehensively investigated. The following parameters were varied: fiber used (curaua or sisal), fiber washing or surface chemical treatment with sodium hydroxide/sodium borohydride, fiber length (from 5 to 60 mm), hybridization with glass fiber and the pre-processing of the polyester resin. The overall fiber volume fraction was kept constant (30 vol.%). In all configurations, the composites containing curaua fiber obtained higher short beam strength than those with sisal. An increase in fiber length yielded higher short beam strength. The optical and electronic micrographs showed mostly horizontal cracks, typical of shear failure. In addition, it was carried out a study of the ASTM D2344 standard regarding the span-to-thickness ratio recommended for testing, the measured strength decreased for higher span-to-thickness ratio for specimens with higher length and width, and the failure mode changed to bending around span-to-thickness >12.

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Section: Resultsmentioning

confidence: 99%

Short beam strength of curaua, sisal, glass and hybrid composites

Silva

Júnior

Angrizani

et al. 2012

Journal of Reinforced Plastics and Composites

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“…The curing was performed at 25 C for 24 h, followed by a first post-curing at 80 C for 6 h and a second post-curing at 120 C for 2 h. The first post-curing ensures that no further chemical modification will occur while the second post-curing eliminates mechanical stress. 11,12…”

Section: Preparation Of Compositesmentioning

confidence: 99%

Influence of fiber hybridization on the dynamic mechanical properties of glass/ramie fiber-reinforced polyester composites

Romanzini

Ornaghi

Amico

et al. 2012

Journal of Reinforced Plastics and Composites

100

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This study aims to evaluate the influence of fiber hybridization and frequency on the dynamic mechanical properties of ramie/glass hybrid fiber-reinforced polyester composites. The storage modulus (E 0 ), loss modulus (E 00 ) and damping behavior (tan d) were evaluated as a function of different relative glass/ramie fiber volume ratios. For the storage modulus, the importance of the reinforcement effect above T g was revealed. Also, the peak height, peak width at half-height and relaxation area were investigated for the loss modulus and tan d curves, showing the influence of a shoulder below T g for each case. Finally, the tan d peak shifts to higher temperatures by increasing the frequency. Higher activation energy was observed for 75% glass fiber-containing composites.

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“…IR spectroscopy has been employed for many years to study the curing of unsaturated polyester resins [5][6][7][8][9][10][11]. The published research results in most cases relate to the mass of the material or its near-surface layers (when typical crystals made from ZnSe or KRS-5 ae used, the depth of penetration of the IR beam e.g.…”

Section: Curing Of Polyester Resinsmentioning

confidence: 99%

“…refs. [9][10][11]. Figure 3 shows the results of nanoindentation of Polimal 109 coatings subjected to photocuring.…”

Section: Infrared Spectroscopy (Ft-ir)mentioning

confidence: 99%

“…This is shown by the constant ratio (even after an irradiation time of 30 min) of the absorbance value of the carbonyl group at 1745 cm -1 or of the ester group at 1258 cm -1 originating from the polyester to the absorbance values at 1600 cm -1 and 911 cm -1 respectively which are characteristic of polystyrene. The content of free styrene in the resin which could evaporate as a result of heating is small, as is shown by the low intensity of the absorption bands at 911 and 1494 cm -1 [10,27]. We are aware, however, of a certain error involved in the comparison of absorption band intensities corresponding to a wide wave number range.…”

Section: Infrared Spectroscopy (Ft-ir)mentioning

confidence: 99%

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