掺杂金属原子对聚ε-己内酯降解的稳定性影响

Macromol Pub Date : 2022-08-05 DOI:10.3390/macromol2030025
T. Zaharescu, T. Borbath, M. Mariș, I. Borbath, M. Mariș
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引用次数: 0

摘要

高分子材料的稳定性本质上是由分子结构和添加剂及杂质的存在所决定的。当聚合物衬底受到高能处理的剧烈破坏时,分子断裂产生碎片,这些碎片可以被扩散的氧氧化。微量的氧化物催化剂可能意外地掺入到聚合物材料中,引发更快的氧化,从而影响材料的耐久性。本文研究了在0.1 mol%的浓度下,负载2 wt%掺有外源原子(Cr, Nd, Mg, Mn, Ti)的PbZrO3的聚ε-己内酯(PCL)的行为。化学发光的研究过程揭示了PCL的加速降解。存在于PbTiO3粉末结构中的金属痕量的贡献通过参与氧化传播的活化能(Ea)来表征。当聚合物基材以较高的加热速率加热时,自由基参与了更快的氧化。在长时间加热和辐照下氧化水平的比较表明,在氧化物粉末填料中,特别是在超过150°C的温度下,金属痕量的持续活性。提出了材料抗氧化强度的基本考虑因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Stability Consequences Promoted by Doping Metallic Atoms on the Degradation of Poly (ε-Caprolactone)
The stability of polymer materials is essentially determined by the molecular structure and the presence of additives and impurities. When a polymer substrate is subjected to vigorous damage by an energetic treatment, the molecular scission generates fragments, which may be oxidized by the diffused oxygen. The traces of oxide catalysts that may be accidentally incorporated into the polymer materials initiate a faster oxidation that influences the material durability. This study presents the behavior of poly (ε-caprolactone) (PCL) loaded with 2 wt% PbZrO3 previously doped with foreign atoms (Cr, Nd, Mg, Mn, Ti) at the concentration of 0.1 mol%. The investigation procedure, chemiluminescence, reveals the acceleration of the degradation of PCL. The contribution of the metallic traces existing in the structure of PbTiO3 powder is characterized by the activation energies (Ea) involved in the propagation of oxidation. The free radicals are involved in a faster oxidation, when the polymer substrate is heated at superior rates. The comparison of the oxidation levels at the extended period of heating and irradiation indicates the sustained activities of metallic traces acting in oxide powder fillers, especially at temperatures exceeding 150 °C. The essential considerations on material strength against oxidation are presented.
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CiteScore
5.20
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