Carbon foam based on epoxy/novolac precursor as porous micro-filler of epoxy composites

Szeluga, Urszula; Pusz, S.; Kumanek, Bogumiła; Myalski, J.; Hekner, Bartosz; Tsyntsarski, Boyko; Oliwa, Rafał; Trzebicka, Barbara

doi:10.1016/j.compositesa.2017.11.004

Cited by 23 publications

(14 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is also clear that irradiation times longer than 6 min can additionally induce the photodegradation of polymer networks. It is indicated the cross-linked network of the epoxy novolac resin shows characteristic Raman spectra peaks at 1242, and 1084 cm -1 attributed to -C-O, and -C-O-C groups, respectively; while the peaks at 915 and 828 cm -1 are directly related to the stretching C-O-C and C-O of oxirane groups [57]. The process of the epoxy conversion was complementary monitored by changes in the band corresponding to the oxirane group vibrations at 1086 cm -1 shown in the experimental Raman spectra ( Figure 10).…”

Section: Resultsmentioning

confidence: 98%

UV-light-induced curing of branched epoxy novolac resin for coatings

Gaidukovs¹,

Medvids²,

Onufrijevs³

et al. 2018

Express Polym. Lett.

View full text Add to dashboard Cite

Usually, the processing technology of the thermoset polymers is characterized by the use of the two component formulations, which generally consist of a polymer resin and a hardener. These two component polymer formulations need to be hardened for almost 12 hours at room temperature [1, 2]. Generally, extra heating at 60-160°C is necessary to facilitate the hardening process [3]. The conventional curing process has several relevant disadvantages. Firstly, as the prerequisite condition for acceptable final properties of the produced material, the following thermal treatment is always desirable as a post-curing process [4]. Secondly, there are difficulties with producing large monolith constructions and coating large surfaces that can be sensitive to heating and/or when heating is even impossible [5]. For example, the repair service protective coatings applications for ships in the maritime industry, and for power generators in the energy generation sector [6]. The market of ultraviolet (UV) curable polymers is growing very rapidly, especially in the last decades [7]. This market is anticipated to grow by 7.0% from 2013 to 2019 and is expected to reach USD 7.930

show abstract

Section: Resultsmentioning

confidence: 98%

UV-light-induced curing of branched epoxy novolac resin for coatings

Gaidukovs¹,

Medvids²,

Onufrijevs³

et al. 2018

Express Polym. Lett.

View full text Add to dashboard Cite

show abstract

“…As a raw polyamide material (PA6), Tarnamid T-30 (Grupa Azoty S.A., Tarnów, Poland) was used in the form of granules. In previous works [ 24 , 25 , 26 ], we discovered that glassy carbon has a beneficial influence at metal and epoxy matrix composites, however no research in thermoplastic composites has been performed. To assess usage of glassy carbon as tribology improvement filler, it was compared with much cheaper biocarbon and with nanomaterial (graphene oxide), that should have the best influence.…”

Section: Methodsmentioning

confidence: 99%

Effect of Carbon Fillers on the Wear Resistance of PA6 Thermoplastic Composites

2020

Self Cite

View full text Add to dashboard Cite

In this study, the influence of different carbon fillers on the tribological and manufacturing properties of the thermoplastic polyamide PA6 is presented. The following materials were used as carbon additives: glassy carbon (GC), carbon obtained from the pyrolysis of polymer wastes (BC), and graphene oxide (GO). Fillers were introduced into the PA6 matrix by mechanical stirring in alcohol to settle carbon particles onto the granule surface. Samples were made by injection molding from the produced granules. The microstructure, hardness, and melt flow index (MFI) of the prepared materials were determined. Also, the degree of crystallinity of the samples was examined by Differential Scanning Calorimetry (DSC) and X-ray Diffraction (XRD). The melting point (Tm) was examined using DSC, the results from which allowed the correct heat treatment of PA6 to increase the crystallinity of the obtained material to be selected. The dry sliding tribological behavior of the composites was evaluated via pin-on-block tests against cast iron counterparts. The tests were performed at room temperature, with a sliding speed 0.1 m/s, a sliding distance of 250 m, and a normal force of 40 N. The obtained results revealed that the introduction of GO into the PA6 matrix provides favorable wear behavior, such as the formation of debris that acts as rollers that give a decrease in wear and a lower coefficient of friction. The coefficient of friction in samples with graphene oxide was nearly two times lower than with other samples. However, the ease of manufacture of this material was drastically reduced compared to GC or BC fillers. Microstructural investigations of wear tracks revealed poor adhesion between the polymer matrix and micrograins of carbon fillers (GC and BC), and therefore their influence on tribological properties was less compared to graphene oxide.

show abstract

“…Для снижения горючести эпоксидно-новолачных пеноматериалов активно используется вспучивающийся графит (ВГ), структура которого представлена на рисунке 1 [13]. Он обладает устойчивостью к повышенным температурам, способностью поглощать энергию и перераспределять тепло [14].…”

Section: модификация вспучивающимся графитомunclassified

“…Термогравиметрический анализ показал термическую устойчивость полученного материала при температурах до 900°С [13].…”

Section: рис 2 молекула диглицидилового эфира бисфенола а (дгэба)unclassified