Degradation of nano ZnO‐glass fiber‐unsaturated polyester composites

Peng, Guirong; Liu, Qingshan; Yang, Yijie; Wang, Haifeng

doi:10.1002/app.29988

Cited by 10 publications

(8 citation statements)

References 14 publications

(21 reference statements)

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“…ZnO catalyzed the decarbonylation process by cleavage of C-O bond on the surface [33]. A recent study performed in polylactide/ZnO nanocomposites [34] has demonstrated that with increasing doping percentage 1) the rate of oxidation enhanced and 2) the oxidation became more and more superficial.…”

Section: Introductionmentioning

confidence: 99%

Effects of ZnO quantum dots on the photostability of acrylate photopolymers used as recording materials

Goourey

Wong-Wah-Chung

Balan

et al. 2018

Polymer Degradation and Stability

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ZnO quantum dots, QDs (5 nm diameter) by their photogenerated charge carriers clearly influence the degradation of the acrylate host matrix, under conditions simulating solar light.As a result, QDs undergo a partial quenching of their fluorescence. To rationalize this influence, the investigation requires understanding the photochemical behavior of the acrylate photopolymer (carrier of ester and ether groups) in the absence of nanofiller. The matrix undergoes simultaneously a post-polymerization and photooxidative degradation. Infrared analysis and headspace gas chromatography coupled with mass spectrometry reveal that the main volatile organic compounds result from the oxidation of the ether groups, supposed to be the primary sites of degradation.The nanofiller increases the rate of degradation. Also, the concentration of the volatile organic compounds is all the more important as the doping percentage increases. However, the photostability of ZnO/polymer material strongly depends on the size of the nanoparticles.Whereas ZnO QDs display a photocatalytic effect, nanoparticles with a bigger size (10-30 nm) exhibit an unexpected UV-screening effect.

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Section: Introductionmentioning

confidence: 99%

Effects of ZnO quantum dots on the photostability of acrylate photopolymers used as recording materials

Goourey

Wong-Wah-Chung

Balan

et al. 2018

Polymer Degradation and Stability

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“…In addition, it is noted that the TGA and DTG curves for PA6/LGF/ZnO (64/30/6) composites move to lower temperature compared with that of PA6/LGF (70/30) composites. It means that T max drops and the thermal stability decreases when ZnO is filled in PA6 composites, as the same effect on the addition of ZnO in unsaturated polyester composites by the change of degradation mechanism in another report …”

Section: Resultsmentioning

confidence: 66%

“…It means that T max drops and the thermal stability decreases when ZnO is filled in PA6 composites, as the same effect on the addition of ZnO in unsaturated polyester composites by the change of degradation mechanism in another report. [19] The TGA and DTG curves of PA6/LGF (70/30) composites with different UV ageing time at a heating rate of 10 C/min are shown in Figure 5. The TGA curve of the composites at the range of 440 C to 465 C shifts to a low temperature with increasing the UV ageing time.…”

Section: Thermal Stabilitymentioning

confidence: 99%

Assessing effects of ultraviolet ageing on the thermal properties and thermal degradation kinetics of long glass fiber‐reinforced polyamide 6 composites filled with zinc oxide

Guo

Wang

et al. 2019

Polymer Composites

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In this work, the effects of ultraviolet (UV) ageing on the thermal stability, mechanical properties, and thermal degradation kinetics of long glass fiber‐reinforced polyamide 6 (PA6/LGF) composites filled with zinc oxide (ZnO) are analyzed. The composites with different contents of ZnO expose in the UV radiation of the wavelength of 340 nm for 0 to 800 h. An increase in tensile strength and a decrease in impact strength are observed with longer ageing time while samples filled with ZnO have a higher retention rate of tensile and impact strength after long time ageing. The morphology of the impact fractures of aged and unaged samples obtained by scanning electronic microscopy shows nearly no difference. Then the thermal stability and degradation kinetics of the samples with different filler fraction and different ageing time are investigated by thermal gravimetric analysis with the methods of Kissinger, Friedman, and Flynn‐Wall‐Ozawa in the dynamic measurements (10‐40°C/min). Calculated apparent activation energy (E) values by the three methods show that the samples filled with 6 wt% ZnO have a slightly lower value of E than PA6/LGF composites and nearly no change after longtime UV irradiation.

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“…Three‐phase composites have also been studied intensively. Peng used ZnO as a stabilizer and investigated the degradation mechanism of ZnO‐ GF‐unsaturated polyester composite under exposure to a metal halide lamp . Cui employed nano‐ZnO treated by KH‐550 coupling agent and GFs to improve the mechanical performance and melt flowability of PP .…”

Section: Introductionmentioning

confidence: 99%

“…Peng used ZnO as a stabilizer and investigated the degradation V C 2016 Wiley Periodicals, Inc. mechanism of ZnO-GF-unsaturated polyester composite under exposure to a metal halide lamp. 23 Cui employed nano-ZnO treated by KH-550 coupling agent and GFs to improve the mechanical performance and melt flowability of PP. 24 However, there is no work focusing on the effect of T-ZnOw and GF on iPP crystal forms, thus affecting the mechanical and thermal behavior of iPP.…”

Section: Introductionmentioning

confidence: 99%

Synergistic enhancement of glass fiber and tetrapod‐shaped ZnO whisker on the mechanical and thermal behavior of isotactic polypropylene

Zhao

Cheng

Leng

et al. 2016

J of Applied Polymer Sci

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Improvement of mechanical and thermal properties is always the goal of high‐performance general plastic for engineering applications. Herein, isotactic polypropylene/glass fiber/tetrapod‐shaped zinc oxide (iPP/GF/T‐ZnOw) composites are developed via melt‐extrusion on twin‐screw extruder. To improve the distribution of T‐ZnOw in iPP matrix, T‐ZnOw is first modified by various silane coupling agents and its structure is characterized by scanning electron microscopy, Fourier transform infrared spectra, and X‐ray diffraction (XRD). The optimized treatment condition is determined via comparison of activation index. The introduction of GF and T‐ZnOw could improve the mechanical properties including tensile strength, elastic modulus, flexural strength, flexural modulus, and impact strength, indicating that the surface modification and compatibilizer could enhance the interfacial interaction of iPP/GF/T‐ZnOw composites. Moreover, XRD and differential scanning calorimentryresults show that T‐ZnOw as a novel β‐nucleating agent could induce the formation of β‐crystal and the existence of GF counteracts the formation of β‐crystal induced by T‐ZnOw. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44217.

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Degradation of nano ZnO‐glass fiber‐unsaturated polyester composites

Cited by 10 publications

References 14 publications

Effects of ZnO quantum dots on the photostability of acrylate photopolymers used as recording materials

Effects of ZnO quantum dots on the photostability of acrylate photopolymers used as recording materials

Assessing effects of ultraviolet ageing on the thermal properties and thermal degradation kinetics of long glass fiber‐reinforced polyamide 6 composites filled with zinc oxide

Synergistic enhancement of glass fiber and tetrapod‐shaped ZnO whisker on the mechanical and thermal behavior of isotactic polypropylene

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