The optimum synergistic melt blending of 18 antioxidants and light stabilizers has been evaluated using differential scanning calorimetry (DSC) analysis and melting point phase plots obtained to evaluate any effective true eutectic mixtures. Although only three systems gave true eutectic mixtures, optimum lower temperature melt blends were possible up to 230°C. Systems with Lowilite 26 and Cyasorb 1164 showed effective eutectic mixtures especially with hindered piperidine stabilizers while those based on Anox 20 and Lowilite 62 were poor. Eutectic mixtures between aromatic phenolics and amines infer that they are not simply a mechanical mixture of the two components, but a preferential ordering of atomic planes occurs during their formation associated with intermolecular hydrogen bonding. Fourier transform infra-red spectroscopy (FTIR) and ultra-violet (UV) absorption analysis showed in some cases strong bonding interactions between some of the additives where hydroxyl, amine, and carbonyl groups can potentially interact. This was especially notable where strong eutectic behavior was observed for benzophenone absorbers, where alkoxy substitution (Lowilite 22) was replaced by hydroxyl groups (Lowilite 24). Strong interaction between hindered piperidine and phenolic antioxidants also gave effective eutectic lattice phases. The analysis is discussed in relation to potential outcomes for the use of additive melt blends in polymer stabilization.

中文翻译：

---

聚合物添加剂在无尘共混物开发中的合金效应：DSC 和光谱评估

使用差示扫描量热法 (DSC) 分析和获得的熔点相图评估了 18 种抗氧化剂和光稳定剂的最佳协同熔融共混，以评估任何有效的真正共晶混合物。虽然只有三个系统提供了真正的共晶混合物，但最佳的低温熔体共混物可能达到 230°C。具有 Lowilite 26 和 Cyasorb 1164 的系统显示出有效的低共熔混合物，尤其是具有受阻哌啶稳定剂的体系，而基于 Anox 20 和 Lowilite 62 的体系则较差。芳香酚类和胺类之间的共晶混合物推断它们不仅仅是两种组分的机械混合物，而是在它们与分子间氢键相关的形成过程中发生原子平面的优先排序。傅里叶变换红外光谱 (FTIR) 和紫外 (UV) 吸收分析显示，在某些情况下，羟基、胺和羰基可能相互作用的一些添加剂之间存在强键合相互作用。这在二苯甲酮吸收剂观察到强共晶行为时尤其值得注意，其中烷氧基取代（Lowilite 22）被羟基（Lowilite 24）取代。受阻哌啶和酚类抗氧化剂之间的强相互作用也产生了有效的共晶晶格相。该分析讨论了在聚合物稳定中使用添加剂熔体共混物的潜在结果。这在二苯甲酮吸收剂观察到强共晶行为时尤其值得注意，其中烷氧基取代（Lowilite 22）被羟基（Lowilite 24）取代。受阻哌啶和酚类抗氧化剂之间的强相互作用也产生了有效的共晶晶格相。该分析讨论了在聚合物稳定中使用添加剂熔体共混物的潜在结果。这在二苯甲酮吸收剂观察到强共晶行为时尤其值得注意，其中烷氧基取代（Lowilite 22）被羟基（Lowilite 24）取代。受阻哌啶和酚类抗氧化剂之间的强相互作用也产生了有效的共晶晶格相。该分析讨论了在聚合物稳定中使用添加剂熔体共混物的潜在结果。