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首页> 外文期刊>RSC Advances >Nucleated nanocomposites of TPU-PDMS blends based on spherical nanohydroxyapatite
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Nucleated nanocomposites of TPU-PDMS blends based on spherical nanohydroxyapatite

机译：基于球形纳米羟基磷灰石的TPU-PDMS共混物的有核纳米复合材料

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摘要

The present investigation gives a profound insight into the preparation of nucleated nanocomposites of TPU-PDMS blends based on uniquely synthesized PPG-wrapped spherical nanohydroxyapatite (nHap). The spherical nHap at different doses of 1, 3, 5 and 7 phr in different blends of 90 : 10, 80 : 20, 70 : 30, 60 : 40, and 50 : 50 (TPU : PDMS) were prepared. Based on the mechanical properties of the nanocomposites as well as their scope in the field of biomedical applications, detailed studies were carried out for the 70 : 30 blend (T70P30) nanocomposites. The effect of nHap on the mechanical and thermal properties of the T70P30 blend has been thoroughly analysed by using a universal testing machine (UTM), dynamic mechanical analyser (DMA), differential scanning calorimetry (DSC) and a thermogravimetric analyser (TGA). The incorporation of nHap into the T70P30 blend is promoted by the enhanced nucleation effect and has shown a considerable improvement in the tensile strength, storage modulus and thermal stability over the neat blend. The enhancements in these properties are due to better dispersion, which has been confirmed by field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). DSC revealed the role of filler dosage in nucleation efficiency of nanocomposites. X-ray diffraction (XRD) studies were also carried out for the structural analysis and observed an increasing trend in crystallinity of the nanocomposite with filler dosage. The crystallinity, T-g and Delta H values of the nanocomposites with 7 phr nHap (T70P30H7) met the properties of pristine TPU.
机译：本研究为基于独特合成的PPG包裹的球形纳米羟基磷灰石（nHap）的TPU-PDMS共混物的有核纳米复合材料的制备提供了深刻的见识。在90：10、80：20、70：30、60：40和50:50（TPU：PDMS）的不同混合物中，制备了1,3、5和7 phr不同剂量的球形nHap。基于纳米复合材料的机械性能及其在生物医学应用领域的范围，对70:30共混物（T70P30）纳米复合材料进行了详细的研究。使用通用测试机（UTM），动态力学分析仪（DMA），差示扫描量热仪（DSC）和热重分析仪（TGA）已彻底分析了nHap对T70P30共混物的机械和热性能的影响。通过增强成核作用，可将nHap掺入T70P30共混物中，与纯共混物相比，其拉伸强度，储能模量和热稳定性已得到显着改善。这些性能的增强归因于更好的分散性，这已通过场发射扫描电子显微镜（FESEM）和高分辨率透射电子显微镜（HRTEM）得以证实。 DSC揭示了填料用量在纳米复合材料成核效率中的作用。还进行了X射线衍射（XRD）研究以进行结构分析，并观察到随着填料用量的增加，纳米复合材料的结晶度呈上升趋势。具有7 phr nHap（T70P30H7）的纳米复合材料的结晶度，T-g和Delta H值满足原始TPU的性能。

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