Abstract The present investigation reports the synthesis of chitosan wrapped hydroxyapatite (CS-Hap) nanorods by co-precipitation method. 1, 3 and 5 parts of CS-Hap were introduced into TPU-PDMS (T70-P30) blend matrix and the nanocomposites were prepared by solution mixing technique. The incorporation of CS-Hap enhanced the physico-mechanical properties of the blend matrix, mainly 130% improvement in tensile strength at 5 parts of CS-Hap addition. The dispersion and distribution of the CS-Hap in TPU-PDMS matrix was confirmed using FESEM and HRTEM techniques. The storage modulus and tan δ were improved with filler addition in all the nanocomposites. The XRD of nanocomposites reveals the intensity of crystalline planes correspond to CS-Hap was increased with filler addition and at 5 parts of CS-Hap, the crystallinity was enhanced by 40% as compared to the pristine TPU-PDMS blend. The CS-Hap promotes the thermal stability of nanocomposites due to the synergistic effect of physico-chemical interaction and superior crystallization behavior.

中文翻译：

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基于壳聚糖包裹羟基磷灰石纳米棒的 TPU-PDMS 共混物纳米复合材料

摘要 本研究报道了通过共沉淀法合成壳聚糖包裹的羟基磷灰石（CS-Hap）纳米棒。将 1、3 和 5 份 CS-Hap 引入 TPU-PDMS (T70-P30) 共混基质中，并通过溶液混合技术制备纳米复合材料。CS-Hap 的加入增强了共混基质的物理机械性能，主要是在添加 5 份 CS-Hap 时拉伸强度提高了 130%。使用 FESEM 和 HRTEM 技术确认了 CS-Hap 在 TPU-PDMS 基质中的分散和分布。在所有纳米复合材料中，随着填料的加入，储能模量和 tan δ 得到改善。纳米复合材料的 XRD 显示对应于 CS-Hap 的晶面强度随着填料的加入和 5 份 CS-Hap 的增加而增加，与原始 TPU-PDMS 共混物相比，结晶度提高了 40%。由于物理化学相互作用和优异的结晶行为的协同作用，CS-Hap 促进了纳米复合材料的热稳定性。