Thermo-oxidative degradation of Nylon 1010 films: Colorimetric evaluation and its correlation with material properties

Cai, Li-Hai; Zhou, Qi; Xu, Jun; Guo, Baohua; Huang, Zhong-Yao

doi:10.1016/j.cclet.2016.11.017

Cited by 13 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A color change usually accompanies intensive thermo-oxidative degradation of thermoplastic polymers [ 62 ]. The most characteristic changes are yellowing of the material, indicated by the increase of the parameter b* in the CIELab [ 63 ], which, according to Cai [ 62 ], is the most accurate colorimetric coordinate for assessment of potential degradation of polymers. Additionally, the yellowness index (YI) was calculated according to Equation (5) for all extruded polymer series and is presented in Figure 5 .…”

Section: Resultsmentioning

confidence: 99%

“…Samples in the form of semi-translucent thick foil were tested on a white sheet of defined color with parameters L* 91.56, and a* 1.83, b* −9.93. A color change usually accompanies intensive thermo-oxidative degradation of thermoplastic polymers [62]. The most characteristic changes are yellowing of the material, indicated by the increase of the parameter b* in the CIELab [63], which, according to Cai [62], is the most accurate colorimetric coordinate for assessment of potential degradation of polymers.…”

Section: Calorimetric Investigation Of Pla Morphology Changementioning

confidence: 99%

See 1 more Smart Citation

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

et al. 2020

View full text Add to dashboard Cite

This article presents the effect of twin-screw extrusion processing parameters, including temperature and rotational speed of screws, on the structure and properties of four grades of polylactide (PLA). To evaluate the critical processing parameters for PLA and the possibilities for oxidative and thermomechanical degradation, Fourier-transform infrared spectroscopy (FT-IR), oscillatory rheological analysis, and differential scanning calorimetry (DSC) measurements were used. The influence of degradation induced by processing temperature and high shearing conditions on the quality of the biodegradable polyesters with different melt flow indexes (MFIs)was investigated by color analysis within the CIELab scale. The presented results indicate that considering the high-temperature processing of PLA, the high mass flow index and low viscosity of the polymer reduce its time of residence in the plastifying unit and therefore limit discoloration and reduction of molecular weight due to the degradation process during melt mixing, whereas the initial molecular weight of the polymer is not an essential factor.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Calorimetric Investigation Of Pla Morphology Changementioning

confidence: 99%

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

et al. 2020

View full text Add to dashboard Cite

show abstract

“…e wavenumber range was from 400 to 4000 cm −1 by signal averaging 32 scans at a resolution of 4 cm −1 . e carbonyl index (A C�O /A C-H ) was defined as the area ratio of carbonyl absorbance to the reference peak [21][22][23], and the changes in the carbonyl absorbance are represented in detail in the region of 1600-1800 cm −1 . e 2856 cm −1 peak was attributed to the C-H stretching according to the previous literature [24].…”

Section: Carbonyl Index Determinationmentioning

confidence: 99%

Study on the Photodegradation Stability of Poly(butylene Succinate-co-butylene Adipate)/TiO₂ Nanocomposites

Cai

Zhou

et al. 2019

Journal of Chemistry

Self Cite

View full text Add to dashboard Cite

A poly(butylene succinate-co-butylene adipate)/TiO2 (PBSA/TiO2) nanocomposite was prepared by a melt-blending process. The effect of TiO2 nanoparticles on the photodegradation behaviors of the nanocomposite was investigated by transmission electron microscopy (TEM), differential scanning calorimetry (DSC), Fourier-transform infrared spectroscopy (FT-IR), field-emission scanning electron microscopy (FE-SEM), rheological measurements, and mechanical tests. TEM images of the PBSA/TiO2 revealed that the TiO2 nanoparticles were well dispersed in the matrix without obvious aggregation. The FT-IR results indicated that the TiO2 nanoparticles can block high-energy ultraviolet (UV) light and reduce the degradation of the PBSA matrix. The viscosity analysis results indicated that the TiO2 nanoparticles inhibited the chain scission of PBSA matrix under irradiation. In addition, the surface of the PBSA/TiO2 films and their mechanical properties change less than that of untreated PBSA films during the photoaging process. The obtained results imply that the TiO2 nanoparticles can be considered as an efficient photodegradation-resistant additive to PBSA for reducing photodegradation.

show abstract

“…A threshold value of ∆E = 1 was assumed to be a perceptible color change by human eye [ 39 ]. A color change of thermoplastic polymers typically entails intensive thermo-oxidative or photo-oxidative degradation [ 40 , 41 , 42 ]. Table 1 and Table 2 report the average values of color parameters L*, a*, b* (measured in triplicate), and the total color variation (∆E) measured according to the CIELAB system of samples of the EVOH and PVA composites, respectively, to visually evaluate the overall processes taking place.…”

Section: Resultsmentioning

confidence: 99%

“…The most significant color variation on the polymer composites as the temperature rises was the yellowing of the material. It was indicated by the increase of parameter b* (blue–yellow axis) on the CIELAB scale, which, according to Cai [ 41 ] is the most accurate colorimetric coordinate to evaluate the potential degradation of polymers. Moreover, the yellowing of the material became more noticeable when increasing the NP concentration.…”

Section: Resultsmentioning

confidence: 99%

Aging Studies on Food Packaging Films Containing β-Cyclodextrin-Grafted TiO2 Nanoparticles

Goñi-Ciaurriz

Senosiain-Nicolay

Vélaz

2021

IJMS

View full text Add to dashboard Cite

Polymeric materials, such as polyvinyl alcohol (PVA) and ethylene–PVA copolymers (EVOH) are widely used in the food sector as packaging materials because of their excellent properties. TiO2 nanoparticles (NPs) show photocatalytic activity; when added to the aforementioned polymers, on the one hand, they are expected to provide bactericidal capacity, whereas on the other hand, they could favor nanocomposite degradation. These types of nanoparticles can be derivatized with cyclodextrin macromolecules (CDs), which can act as food preservative carriers, increasing the packaging food protective properties. In this work, films containing β-Cyclodextrin (βCD)-grafted TiO2 nanoparticles and PVA or EVOH were prepared. Regarding the photocatalytic activity of the nanoparticles and the possible environmental protection, accelerated aging tests for PVA, EVOH, and their composites with cyclodextrin-grafted TiO2 nanoparticle (NP) films were performed by two methods, namely, stability chamber experiments at different conditions of temperature and relative humidity and UV light irradiation at different intensities. After analyzing the systems color changes (CIELAB) and Fourier transform infrared spectroscopy (FTIR) spectra, it was observed that the film degradation became more evident when increasing the temperature (25-80 °C) and relative humidity percentage (28–80%). There was no significant influence of the presence of CDs during the degradation process. When irradiating the films with UV light, the largest color variation was observed in the nanocomposite films, as expected. Moreover, the color change was more relevant with increasing NP percentages (1-5%) due to the high photocatalytic activity of TiO2. In addition, films were characterized by FTIR spectroscopy and variation in the signal intensities was observed, suggesting the increase of the material degradation in the presence of TiO2 NPs.

show abstract

Thermo-oxidative degradation of Nylon 1010 films: Colorimetric evaluation and its correlation with material properties

Cited by 13 publications

References 24 publications

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

Study on the Photodegradation Stability of Poly(butylene Succinate-co-butylene Adipate)/TiO₂ Nanocomposites

Aging Studies on Food Packaging Films Containing β-Cyclodextrin-Grafted TiO2 Nanoparticles

Contact Info

Product

Resources

About

Thermo-oxidative degradation of Nylon 1010 films: Colorimetric evaluation and its correlation with material properties

Cited by 13 publications

References 24 publications

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

Correlation between Processing Parameters and Degradation of Different Polylactide Grades during Twin-Screw Extrusion

Study on the Photodegradation Stability of Poly(butylene Succinate-co-butylene Adipate)/TiO2 Nanocomposites

Aging Studies on Food Packaging Films Containing β-Cyclodextrin-Grafted TiO2 Nanoparticles

Contact Info

Product

Resources

About

Study on the Photodegradation Stability of Poly(butylene Succinate-co-butylene Adipate)/TiO₂ Nanocomposites