Accelerated weathering of unsaturated polyester resins. Aspects of appearance change

Sampers, Jacques; Hutten, Edwin; Gijsman, Pieter

doi:10.1016/j.polymertesting.2015.04.012

Cited by 17 publications

(7 citation statements)

References 14 publications

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“…In this paper the polymer cobalt solution was used as an accelerator, its ions took part in the reaction and the surfaces of the samples ultimately appeared yellow. According to Sampers et al [20] the cobalt-complexes absorb UV radiation and this absorption plays a significant role in the mechanism of discoloration of samples cured in the presence of cobalt accelerator The yellow hue also appeared when dba was used because of its characteristic bright-yellow color. The mechanical and thermomechanical properties of pure unsaturated polyester resin (UPR) and green composites containing wood flour (WF) and dibenzylideneacetone (dba) were determined.…”

Section: Resultsmentioning

confidence: 99%

Green Composites Based on Unsaturated Polyester Resin from Recycled Poly(Ethylene Terephthalate) with Wood Flour as Filler—Synthesis, Characterization and Aging Effect

2020

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The paper investigates the synthesis of green composites and their properties before and after the laboratory accelerated aging tests. Materials were made of unsaturated polyester resins (UPRs) based on recycled poly(ethylene terephthalate) (PET) and wood flour (WF). The effect of dibenzylideneacetone (dba) addition on mechanical and thermomechanical properties was also determined. Green composites were obtained using environment friendly polymeric cobalt as an accelerator. Before and after exposition to the xenon lamp radiation, the UPRs physically modified by WF were characterized only by a greater flexural modulus compared with the analogous composites based on the pure resin. Addition of dba caused the increase of flexural modulus, flexural strength, strain at break and mechanical loss factor compared to the non-modified material. After aging only the last mentioned parameter took on lower values compared to the pure resin analogues.

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Section: Resultsmentioning

confidence: 99%

Green Composites Based on Unsaturated Polyester Resin from Recycled Poly(Ethylene Terephthalate) with Wood Flour as Filler—Synthesis, Characterization and Aging Effect

2020

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“…3ðPOO þPHÞ k 6ðPOO þPOO Þ $½PH 2 (7) g CO and g m being the yields for carbonyl and volatile compounds formation from hydroperoxide decomposition.…”

Section: On the Differences In Oxidative Stability In Up And Vementioning

confidence: 99%

Thermal oxidation of vinyl ester and unsaturated polyester resins

Arrieta

Richaud

Fayolle

et al. 2016

Polymer Degradation and Stability

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle IDa b s t r a c tThe thermal oxidative ageing of vinyl ester and unsaturated polyester was studied at temperatures ranging from 120 to 160 C and oxygen pressures ranging from 0.02 to 2.0 MPa. The oxidation of both materials was shown to generate anhydrides detected by FTIR spectroscopy, the origin of which being the oxidation of CH 2 group in a position of ester, and significant mass loss. According to FTIR study, vinyl ester was shown to be more oxidizable than unsaturated polyesters but this feature is counterbalanced by a lower volatile yield. The thickness of oxidized layer in diffusion limited oxidation regime was hence observed to be higher in Unsaturated Polyester (ca 600 mm) than in Vinyl Ester (ca 200 mm) at 160 C and seems not affected by the presence of high content of fillers.

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“…Such materials are widely used in the industrial, agricultural, building, and other industries. 2,3 However, typical UPR materials have poor fire retardancy and, poor aging resistance, and suffer from a high level of smoking during combustion; these disadvantages greatly limit its practical application. 4,5 Currently, it is common to incorporate flame retardants in UPR in order to expand its range of applications.…”

Section: Introductionmentioning

confidence: 99%

“…About 60% of the global use of UPR is for producing glass fiber‐reinforced plastic composites, while the remainder is mainly used for decorative castings (such as imitation marble products). Such materials are widely used in the industrial, agricultural, building, and other industries . However, typical UPR materials have poor fire retardancy and, poor aging resistance, and suffer from a high level of smoking during combustion; these disadvantages greatly limit its practical application …”

Section: Introductionmentioning

confidence: 99%

Flame retardancy of unsaturated polyester composites with modified ammonium polyphosphate, montmorillonite, and zinc borate

Jiang

Zhang

Yuan

et al. 2018

J of Applied Polymer Sci

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Ammonium polyphosphate (APP) was modified using a new method, where the resulting modified APP (MAPP) was obtained by mixing APP with unsaturated polyester resin (UPR). MAPP was more effective in improving the flame retardancy of UPR than APP which was due to the improved dispersion of MAPP in UPR composite. Then, the UPR composites were prepared based on dimethyl methylphosphonate, MAPP, montmorillonite, and zinc borate. Finally, the flame‐retardant and mechanical properties of the UPR composites were analyzed using the limited oxygen index (LOI), thermogravimetric analysis, UL‐94 vertical burning test, scanning electron microscopy, cone calorimetry, mechanical tests, and viscosity measurements. The LOI and UL‐94 tests showed that the flame‐retardant properties clearly improved with the addition of fillers in the UPR composites compared to pristine UPR. The synergistic effect of Si‐ and P‐containing flame retardants in this composite resulted in the LOI value increasing from 18.9 to 31.3% and achieved the UL‐94 V‐0 rating. Moreover, the heat release rate was lower than the pristine UPR. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47180.

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Accelerated weathering of unsaturated polyester resins. Aspects of appearance change

Cited by 17 publications

References 14 publications

Green Composites Based on Unsaturated Polyester Resin from Recycled Poly(Ethylene Terephthalate) with Wood Flour as Filler—Synthesis, Characterization and Aging Effect

Green Composites Based on Unsaturated Polyester Resin from Recycled Poly(Ethylene Terephthalate) with Wood Flour as Filler—Synthesis, Characterization and Aging Effect

Thermal oxidation of vinyl ester and unsaturated polyester resins

Flame retardancy of unsaturated polyester composites with modified ammonium polyphosphate, montmorillonite, and zinc borate

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