Methodology for determining selected characteristics of polyethylene dyeing using CIELab system

This paper aims to study the effect of a hindered amine light stabilizer (HALS 770), on the aging behavior of moisture-curable polyurethane (MCPU). MCPU is specifically developed by ourselves for the reinforcement of fragile organic cultural relics in high-humidity environments, but its aging resistance is insufficient. To improve the aging resistance of MCPU, HALS 770 was used to prepare a modified MCPU (MMCPU). A colorimeter, an infrared spectrometer and a thermal analyzer were used to characterize the color and structure changes of MCPU and MMCPU during aging and to determine their aging kinetics. The results show that the activation energy for the thermal decomposition increased from 91-109 kJ/mol to 135-151 kJ/mol. When the color change is used as the indicator for aging, the lifetime of MMCPU under UV aging is 133% longer than that of MCPU, the lifetime of MMCPU under thermal aging at 293 K is 41.3 times that of MCPU. The addition of HALS 770 to MCPU significantly inhibits the aging behavior.

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“…The chromaticity was described using the CIELab (1976) system. The color difference is expressed as ΔE [12,13]:…”

Section: Results Of Uv Agingmentioning

confidence: 99%

The effect of a hindered amine light stabilizer on the aging behavior of moisture-curable polyurethane as a cultural relics consolidant

et al. 2020

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“…Based on the obtained results, the total color difference (Δ E ) of the irradiated film samples stored for 12 months concerning the non-irradiated material (sample 0) was calculated. Color change (Δ E ) can be calculated from the following equation:

where L is the lightness (also referred to as luminance) parameter (maximum value of 100 represents a perfectly reflecting diffuser; the minimum value of zero represents the color black); a is the axis of the red–green character ( +a = redder; −a = greener); b is the axis of the yellow–blue character ( +b = yellower; −b = bluer) [ 61 ].…”

Section: Methodsmentioning

confidence: 99%

Characterization of Biodegradable Food Contact Materials under Gamma-Radiation Treatment

et al. 2023

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Radiation is an example of one of the techniques used for pasteurization and sterilization in various packaging systems. There is a high demand for the evaluation of the possible degradation of new composites, especially based on natural raw materials. The results of experimental research that evaluated the impact of radiation technology on biodegradable and compostable packaging materials up to 40 kGy have been presented. Two commercially available flexible composite films based on aliphatic–aromatic copolyesters (AA) were selected for the study, including one film with chitosan and starch (AA-CH-S) and the other with thermoplastic starch (AA-S). The materials were subjected to the influence of ionizing radiation from 10 to 40 kGy and then tests were carried out to check their usability as packaging material for the food industry. The results showed that the mechanical properties of AA-S films improved due to the radiation-induced cross-linking processes, while in the case of AA-CH-S films, a considerable decrease in the elongation at break was observed. The results also showed a decrease in the WVTR in the case of AA-S and no changes in barrier properties in the case of AA-CH-S. Both materials revealed no changes in the odor analyzed by sensory analysis. In the case of the AA-S films, the higher the radiation dose, the faster the biodegradation rate. In the case of the AA-CH-S film, the radiation did not affect biodegradation. The performed research enables the evaluation of the materials intended for direct contact with food. AA-CH-S was associated with unsatisfactory parameters (exceeding the overall migration limit and revealing color change during storage) while AA-S showed compliance at the level of tests carried out. The study showed that the AA-CH-S composite did not show a synergistic effect due to the presence of chitosan.

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“…Selection of auxiliary materials, especially the type of dyes (organic, inorganic) and the manner of dyeing and an optimal choice of indexes has a direct influence on the costs of processing [24,25]. At the same time, the requirements for dyed materials exposed to the impact of the environment for a long time are getting higher and higher.…”

Section: Wybrane Wskaźniki Użytkowe Oceny Podatności Polipropylenu Na Barwienie Pigmentami O Różnej Odporności Na Uvmentioning

confidence: 99%

“…Products that are expected to be used for a long time are analyzed by methods for prognosing of change in properties of the objects made of plastics [27]. Verification of the color correct choice is carried out with the use of a number of measurement devices for determination of characteristics of colors and is explicitly described in literature [8,24,28]. In special cases, e.g.…”

Section: Wybrane Wskaźniki Użytkowe Oceny Podatności Polipropylenu Na Barwienie Pigmentami O Różnej Odporności Na Uvmentioning

confidence: 99%

Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

Bieliński

Kościuszko

Smolińska

2021

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This study presents an assessment of the effects of usage time for polypropylene (PP) experimental samples including those dyed with pigments of different UV resistance. A standard double cavity mold was used to create the samples by injection molding. Selected indices were analyzed in terms of color change (UV resistance of pigments), and UV radiation resistance of a PP polymer medium. The experiment revealed a significant impact of the accepted usage time and the type of dye concentrates on the indices characterizing the sample color change (CIELab) and a change in the structure and state of the PP medium surface.

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Methodology for determining selected characteristics of polyethylene dyeing using CIELab system

Cited by 9 publications

References 4 publications

The effect of a hindered amine light stabilizer on the aging behavior of moisture-curable polyurethane as a cultural relics consolidant

The effect of a hindered amine light stabilizer on the aging behavior of moisture-curable polyurethane as a cultural relics consolidant

Characterization of Biodegradable Food Contact Materials under Gamma-Radiation Treatment

Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

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