Microtubes with superior mechanical properties are highly desired in modern medical applications due to its convenience in drug delivery and micro invasive surgery. However, poor kink resistance is still a changeling issues because the high axial orientation is inevitable in conventional tube processing procedure. Herein, with combination of rotation extrusion technology and antibacterial titanium dioxide (TiO₂) fibers, a bio‐mimic helical structure consisting of molecular chains, shish kebabs, and fibrous TiO₂ was successfully manipulated. With assistance of helical structure, kink resistance was enhanced without sacrifice the flexibility. The hoop twist strength reached 15.7 MPa, 45% higher than the conventional ones, while axial compressive strength decreased from 9.4 to 7.9 MPa, exhibiting good flexibility. Moreover, further structural analysis demonstrated that the deviated molecular chains and shish kebabs played a predominating role in enhancing kink resistance of the PE tubes rather than rigid TiO₂ fibers, which could provide more theoretical and experimental fundament for design of future medical tubes.

中文翻译：

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通过仿生多尺度螺旋结构具有综合机械性能的聚乙烯/ TiO2医用管

由于其在药物输送和微创手术中的方便性，在现代医学应用中非常需要具有优异机械性能的微管。然而，由于传统的管加工过程中不可避免的高轴向取向，差的抗扭结性仍然是一个令人头疼的问题。在此，结合旋转挤压技术和抗菌二氧化钛（TiO ₂）纤维，由分子链，烤肉串和纤维状TiO ₂组成的仿生螺旋结构被成功操纵。在螺旋结构的帮助下，抗扭结性得到增强，而不会牺牲其柔韧性。环向扭转强度达到15.7 MPa，比常规环向扭转强度高45％，而轴向抗压强度从9.4 MPa降低至7.9 MPa，表现出良好的柔韧性。此外，进一步的结构分析表明，偏离的分子链和烤肉串在增强PE管的抗扭结性方面起着主导作用，而不是刚性的TiO ₂纤维，这可以为将来的医用管设计提供更多的理论和实验基础。