微/纳米二氧化钛增强聚己内酯生物复合材料的非等温降解机制

Processes Pub Date : 2024-06-13 DOI:10.3390/pr12061214
V. Bulatović, M. Jakić, Dajana Kučić Grgić, Jelena Jakić
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引用次数: 0

摘要

了解聚合物复合材料的降解行为对其实际应用至关重要,尤其是在生物医学和环境工程等领域。在这项研究中,我们研究了二氧化钛(TiO2)粒径和含量(含 0.5、1、2、5 和 10 wt% m/nTiO2)对可生物降解聚己内(PCL)生物复合材料降解机制的影响。在 Netzsch Thermokinetics 软件的帮助下,采用弗里德曼法结合多元非线性回归法对制备的生物复合材料的降解动力学进行了评估。结果表明,与含有二氧化钛纳米颗粒的生物复合材料相比,含有二氧化钛微粒的 PCL 生物复合材料的降解机制不同。然而,含有 TiO2 微颗粒的 PCL 生物复合材料显示出三步降解过程,而含有 TiO2 纳米颗粒的 PCL 生物复合材料则显示出四步降解过程。这种差异可归因于观察到的 TiO2 纳米粒子在 PCL 基质中的聚集,这导致降解过程中增加了一个扩散步骤。有趣的是,TiO2 颗粒的加入并没有改变 PCL 的基本降解机制,而是将降解过程延长到了更高的转化率范围。这些发现揭示了填料颗粒的特性与聚合物基质行为之间复杂的相互作用,为设计和优化可生物降解的生物复合材料提供了宝贵的线索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Non-Isothermal Degradation Mechanism of Micro/Nano Titanium Dioxide-Enhanced Polycaprolactone Biocomposite
Understanding the degradation behavior of polymer composites is crucial for their practical application, especially in areas such as biomedicine and environmental engineering. In this study, we investigated the influence of titanium dioxide (TiO2) particle size and content, containing 0.5, 1, 2, 5, and 10 wt% m/nTiO2, on the degradation mechanism of biodegradable polycaprolactone (PCL) biocomposites. The degradation kinetics of the prepared biocomposites were evaluated using the Friedman method in conjunction with multivariate nonlinear regression facilitated by the Netzsch Thermokinetics software. The results indicate different degradation mechanisms for PCL biocomposites containing TiO2 microparticles compared to biocomposites containing TiO2 nanoparticles. However, the PCL biocomposites with TiO2 microparticles showed a three-step degradation process, and the PCL biocomposites with TiO2 nanoparticles exhibited a four-step degradation process. This difference can be attributed to the observed agglomeration of TiO2 nanoparticles within the PCL matrix, which leads to an additional diffusion step in the degradation process. Interestingly, the addition of TiO2 particles did not change the basic degradation mechanism of PCL but prolonged the degradation process to a higher conversion range. These findings shed light on the complicated interplay between the properties of the filler particles and the behavior of the polymer matrix and provide valuable clues for the design and optimization of biodegradable biocomposites.
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