We studied the reinforcing effects of treated and untreated nanohydroxyapatite (NHA) on poly-lactic acid (PLA). The NHA surface was treated with three different types of chemicals; 3-aminopropyl triethoxysilane (APTES), sodium n-dodecyl sulfate (SDS) and polyethylenimine (PEI). The nanocomposite samples were prepared using melt mixing techniques by blending 5 wt% untreated NHA and 5 wt% surface-treated NHA (mNHA). Based on the FESEM images, the interfacial adhesion between the mNHA filler and PLA matrix was improved upon surface treatment in the order of mNHA (APTES) > mNHA (SDS) > mNHA (PEI). As a result, the PLA-5wt%mNHA (APTES) nanocomposite showed increased viscoelastic properties such as storage modulus, damping parameter, and creep permanent deformation compared to pure PLA. Similarly, PLA-5wt%mNHA (APTES) thermal properties improved, attaining higher Tc and Tm than pure PLA, reflecting the enhanced nucleating effect of the mNHA (APTES) filler.

中文翻译：

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用于承重应用的纳米羟基磷灰石增强聚乳酸的粘弹性和热稳定性

W¯¯ Ë研究处理和未处理的纳米羟基磷灰石（NHA）在聚乳酸（PLA）的增强作用。NHA 表面用三种不同类型的化学品处理；3-氨基丙基三乙氧基硅烷 (APTES)，n钠-十二烷基硫酸盐 (SDS) 和聚乙烯亚胺 (PEI)。纳米复合材料样品是使用熔融混合技术通过混合 5wt% 未处理 NHA 和 5wt% 表面处理 NHA (mNHA) 制备的。根据 FESEM 图像，mNHA 填料和 PLA 基体之间的界面粘附在表面处理后按 mNHA (APTES) > mNHA (SDS) > mNHA (PEI) 的顺序得到改善。因此，与纯 PLA 相比，PLA-5wt%mNHA (APTES) 纳米复合材料显示出更高的粘弹性，例如储能模量、阻尼参数和蠕变永久变形。类似地，PLA-5wt%mNHA (APTES) 的热性能得到改善，比纯 PLA 获得更高的 Tc 和 Tm，反映了 mNHA (APTES) 填料增强的成核效果。