Determination of degradation kinetics of two polyester thermosetting powder coatings using TGA and colorimetric analysis

Gheno, Giulia; Ganzerla, Renzo; Bortoluzzi, Marco; Paganica, Roberto

doi:10.1016/j.porgcoat.2014.08.015

Cited by 27 publications

(19 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Yellowing primarily occurred due to the side reactions of the synthetic process, such as the thermal and oxidative degradation of the polyester main chain, which generated vinyl and benzoquinone chromogenic groups. These structures absorbed blue‐violet wavelengths, causing the polyester product to appear yellow . Under the same conditions, the color of PEIST and PEIMT gradually became yellower with increasing modifying monomer content, and their absorbance increased for the near‐UV wavelengths from 320 to 550 nm.…”

Section: Resultsmentioning

confidence: 99%

Implementing plant‐derived isosorbide and isomannide as comonomers for polyester synthesis: Effects of crystallization properties on optical properties

Zhang

Wang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

This article describes the implementation of plant‐derived isosorbide (IS) and isomannide (IM) in the copolymerization modification of poly(ethylene terephthalate). The effects of the two comonomers on the optical, crystallization, and thermal properties of the resulting copolyesters were studied using the following analytical methods: proton nuclear magnetic resonance; differential scanning calorimetry; X‐ray diffraction; thermogravimetry; and ultraviolet‐visible spectroscopy. As comonomers, IS and IM increased the transmittance and reduced the haze of the copolyesters. Moreover, while IM improved the optical properties more than did IS, both monomers improved the optical properties of the copolyesters by lowering its crystallization ability. After the copolymerization modification, the crystallization rate of the copolyesters was reduced, decreasing the crystallinity and crystal size and thereby reducing the light transmission interference. The comonomers also altered the light absorption properties of the copolyesters and conferred a substantial increase in the transmittance of near‐infrared (NIR) wavelengths. These changes in optical properties exhibit the potential of these comonomers for applications in optical materials and NIR detectors. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45444.

show abstract

Section: Resultsmentioning

confidence: 99%

Implementing plant‐derived isosorbide and isomannide as comonomers for polyester synthesis: Effects of crystallization properties on optical properties

Zhang

Wang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…It can be observed that when the heating rate increased, the initial temperature of mass loss was gradually delayed. These were the standard phenomena of the TG test when the heating rates increased progressively 26 – 29 . From Fig.…”

Section: Resultsmentioning

confidence: 90%

Effects of UV for Cycloaliphatic Epoxy Resin via Thermokinetic Models, Novel Calorimetric Technology, and Thermogravimetric Analysis

Laiwang

Liu

Tsai

et al. 2018

Sci Rep

View full text Add to dashboard Cite

The cycloaliphatic epoxy resin selected for this study was 3,4-epoxycyclohexane methyl-3′4′-epoxycyclohexyl-carboxylate (EEC). Epoxy resin has numerous applications, such as varnishes, tires, and electronic materials. However, the extensive used of chlorofluorocarbon (CFC) compounds in the last century has resulted in the formation of a hole in the ozone layer. As a consequence, solar radiation is intensifying gradually; therefore, continuous irradiation by sunlight should be avoided. The results of solar radiation can exacerbate the deterioration and photolysis of compounds. Through thermogravimetry and differential scanning calorimetry, the apparent onset temperature of EEC and EEC was analyzed under UV radiation for different durations. Thermokinetic data were used to determine the parameters of thermal decomposition characteristics through simulation to assess the reaction of EEC and EEC under UV radiation for different durations. The goal of the study was to establish the parameters of thermal decomposition characteristics for the effects of UV on EEC, as well as the probability of severity of thermal catastrophe.

show abstract

“…Generally speaking, the yellowing of polyester is mainly due to the absorption of blue–violet light by benzoquinone groups, which are produced during thermal oxidation or degradation. 23 This shows that the color stability of the copolyesters is reduced with the increase in the amount of MPO, so the light transmittance tends to decrease although all the copolyesters do not crystallize.…”

Section: Resultsmentioning

confidence: 95%

The effect of crystallization properties influenced by 2-methyl-1,3–propanediol units on the optical properties of modified poly(ethylene terephthalate)

Wang

Zhang

et al. 2018

High Performance Polymers

View full text Add to dashboard Cite

In this study, the preparation and properties of poly(ethylene terephthalate-co-2-methyl-1,3-propanediol) copolyester (PEMT) were reported. The PEMT crystallization properties, optical properties, thermal properties, rheological properties, and other properties were characterized by nuclear magnetic resonance (1H NMR), differential scanning calorimetry, thermo gravimetric analysis, ultraviolet visible near-infrared (UV-VIS-NIR) spectroscopy, polarizing microscope crystal culture, X-ray diffraction (XRD), and rheometer. It was proved that the crystallization abilities and crystallization rate of PEMT copolyesters were significantly affected by the content of 2-methyl-1,3-propanediol (MPO) units; the copolyester becomes amorphous when the content of MPO units exceeded 20 mol%. According to the XRD data, the diffraction peaks of PEMT remained unchanged compared with those of poly(ethylene terephthalate). The transmittance of copolyesters displayed a tendency of increasing at first and then declining with the increase in MPO. In addition to the crystallization properties, the transmittance of copolyesters was also affected by the extent of yellowing. When the MPO addition was less than 20 mol%, PEMT can maintain good thermal decomposition performance and processability.

show abstract

Determination of degradation kinetics of two polyester thermosetting powder coatings using TGA and colorimetric analysis

Cited by 27 publications

References 25 publications

Implementing plant‐derived isosorbide and isomannide as comonomers for polyester synthesis: Effects of crystallization properties on optical properties

Implementing plant‐derived isosorbide and isomannide as comonomers for polyester synthesis: Effects of crystallization properties on optical properties

Effects of UV for Cycloaliphatic Epoxy Resin via Thermokinetic Models, Novel Calorimetric Technology, and Thermogravimetric Analysis

The effect of crystallization properties influenced by 2-methyl-1,3–propanediol units on the optical properties of modified poly(ethylene terephthalate)

Contact Info

Product

Resources

About