Szczegóły publikacji
Opis bibliograficzny
The influence of polyoxymethylene molar mass on the oxidative thermal degradation of its nanocomposites with hydroxyapatite / Kinga PIELICHOWSKA // Journal of Thermal Analysis and Calorimetry ; ISSN 1388-6150. — Tytuł poprz.: Journal of Thermal Analysis ; ISSN: 0368-4466. — 2016 — vol. 124 iss. 2, s. 751–765. — Bibliogr. s. 764–765, Abstr. — Publikacja dostępna online od: 2015-12-28
Autor
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 97245 |
|---|---|
| Data dodania do BaDAP | 2016-04-22 |
| Tekst źródłowy | URL |
| DOI | 10.1007/s10973-015-5196-6 |
| Rok publikacji | 2016 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Journal of Thermal Analysis and Calorimetry |
Abstract
In this paper, the influence of mass-average molar mass (M w) of polyoxymethylene (POM) copolymer on the thermooxidative degradation behavior of its nanocomposites with hydroxyapatite (HAp) is reported. POM copolymers’ thermal stability slightly decreases with a decrease in mass-average molar mass. Thermal stability of POM/HAp nanocomposites is lower in comparison with pure POM, and it gets lower with a decrease in mass-average molar mass of POM copolymer. For POM copolymer with the highest molar mass, thermal stability of POM/HAp nanocomposite was ca. 30 °C lower than for pure POM. To get a more in-depth insight into the decomposition process, kinetic analysis of POM/HAp nanocomposite thermal degradation process was performed using Friedman, Ozawa–Flynn–Wall and multiple nonlinear regression methods. The best fit for pristine T2, T3 and T4 copolymers with different molar mass of 100768, 74727 and 68377 g mol−1, respectively, was obtained for one-stage degradation mechanism with autocatalysis, while for T2/10 % HAp and T3/10 % it was parallel reaction model with autocatalysis (Bna) and phase-boundary reaction models (R3). For T4/10 % HAp, the best approximation was found for R2–Bna–D3 reaction model. From hyphenated TG–MS and TG–FTIR thermoanalytical studies, it was found that the main degradation product for POM/HAp nanocomposites is formaldehyde and the amount of other degradation products is lower in comparison with nonmodified POM copolymers.
