Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites
In the present research work, calcium pimelate (CaPim) was synthesized and investigated as an additive for high-density polyethylene (HDPE). HDPE/CaPim nanocomposites were prepared by melt-mixing, with CaPim content ranging from 0.1% to 1%, affording white homogeneous materials. The chemical structu...
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MDPI AG
2024-02-01
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| Online Access: | https://www.mdpi.com/2673-6209/4/1/3 |
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| author | Christina Samiotaki Evangelia Tarani Dimitra Karavasili Alexandra Zamboulis Konstantinos Chrissafis Dimitrios N. Bikiaris |
| author_facet | Christina Samiotaki Evangelia Tarani Dimitra Karavasili Alexandra Zamboulis Konstantinos Chrissafis Dimitrios N. Bikiaris |
| author_sort | Christina Samiotaki |
| collection | DOAJ |
| description | In the present research work, calcium pimelate (CaPim) was synthesized and investigated as an additive for high-density polyethylene (HDPE). HDPE/CaPim nanocomposites were prepared by melt-mixing, with CaPim content ranging from 0.1% to 1%, affording white homogeneous materials. The chemical structure of the nanocomposites and the incorporation of CaPim was confirmed by infrared spectroscopy. The surficial morphology and the additive distribution were examined by scanning electron microscopy. Differential scanning calorimetry and X-ray diffraction measurements showed that the thermal transitions and crystal structure of HDPE are not affected by the incorporation of CaPim, while the mechanical properties are retained overall. This study focuses on the thermal degradation of HDPE nanocomposites, investigating the degradation mechanism and kinetic parameters through various analytical methods. Isoconversional techniques, including the Friedman method, Vyazovkin analysis, and Ozawa Flynn Wall analysis, were employed to calculate activation energies (E<sub>α</sub>). The degradation mechanism and kinetic triplet were determined based on a multivariate non-linear regression method (model-fitting). Finally, the presence of a CaPim additive was shown to increase the E<sub>α</sub> of thermal degradation, consistent with the calculated dependence of E<sub>α</sub> on the degree of conversion and the improved thermal stability of the HDPE matrix. |
| first_indexed | 2024-04-24T18:04:07Z |
| format | Article |
| id | doaj.art-b93bd67992514583a6b12b20500f445b |
| institution | Directory Open Access Journal |
| issn | 2673-6209 |
| language | English |
| last_indexed | 2024-04-24T18:04:07Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Macromol |
| spelling | doaj.art-b93bd67992514583a6b12b20500f445b2024-03-27T13:51:57ZengMDPI AGMacromol2673-62092024-02-0141425710.3390/macromol4010003Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate NanocompositesChristina Samiotaki0Evangelia Tarani1Dimitra Karavasili2Alexandra Zamboulis3Konstantinos Chrissafis4Dimitrios N. Bikiaris5Laboratory of Chemistry and Technology of Polymers and Dyes, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceLaboratory of Advanced Materials and Devices, Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceLaboratory of Chemistry and Technology of Polymers and Dyes, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceLaboratory of Chemistry and Technology of Polymers and Dyes, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceLaboratory of Advanced Materials and Devices, Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceLaboratory of Chemistry and Technology of Polymers and Dyes, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceIn the present research work, calcium pimelate (CaPim) was synthesized and investigated as an additive for high-density polyethylene (HDPE). HDPE/CaPim nanocomposites were prepared by melt-mixing, with CaPim content ranging from 0.1% to 1%, affording white homogeneous materials. The chemical structure of the nanocomposites and the incorporation of CaPim was confirmed by infrared spectroscopy. The surficial morphology and the additive distribution were examined by scanning electron microscopy. Differential scanning calorimetry and X-ray diffraction measurements showed that the thermal transitions and crystal structure of HDPE are not affected by the incorporation of CaPim, while the mechanical properties are retained overall. This study focuses on the thermal degradation of HDPE nanocomposites, investigating the degradation mechanism and kinetic parameters through various analytical methods. Isoconversional techniques, including the Friedman method, Vyazovkin analysis, and Ozawa Flynn Wall analysis, were employed to calculate activation energies (E<sub>α</sub>). The degradation mechanism and kinetic triplet were determined based on a multivariate non-linear regression method (model-fitting). Finally, the presence of a CaPim additive was shown to increase the E<sub>α</sub> of thermal degradation, consistent with the calculated dependence of E<sub>α</sub> on the degree of conversion and the improved thermal stability of the HDPE matrix.https://www.mdpi.com/2673-6209/4/1/3HDPEcalcium pimelatenanocompositesthermal stabilityisoconversional methodsthermal degradation kinetics |
| spellingShingle | Christina Samiotaki Evangelia Tarani Dimitra Karavasili Alexandra Zamboulis Konstantinos Chrissafis Dimitrios N. Bikiaris Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites Macromol HDPE calcium pimelate nanocomposites thermal stability isoconversional methods thermal degradation kinetics |
| title | Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites |
| title_full | Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites |
| title_fullStr | Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites |
| title_full_unstemmed | Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites |
| title_short | Structural Characteristics and Improved Thermal Stability of HDPE/Calcium Pimelate Nanocomposites |
| title_sort | structural characteristics and improved thermal stability of hdpe calcium pimelate nanocomposites |
| topic | HDPE calcium pimelate nanocomposites thermal stability isoconversional methods thermal degradation kinetics |
| url | https://www.mdpi.com/2673-6209/4/1/3 |
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