Polymers that contain mechanical bonds have unique and useful properties. It is difficult to prepare linear polyrotaxanes that contain well-defined mechanical bonds, which has made it challenging to establish the influence of mechanical bonding on linear polyrotaxane properties. We disclose the synthesis of 1,9-decadiene-pseudorotaxane linear copolymers with variable densities of threaded macrocycles using acyclic diene metathesis (ADMET) polymerization. This enabled our investigation into how macrocyclic threading impacts the thermomechanical properties of linear polypseudorotaxanes. Specifically, we observe that the melting enthalpy decreased from 67 to 5 J g⁻¹ as we increased the molar incorporation of a pseudorotaxane unit. Going forward, we expect ADMET to be a useful strategy to prepare linear mechanically interlocked macromolecules at scales relevant for characterizing their thermomechanical properties.

中文翻译：

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越来越多的螺纹聚伪轮化烷，熔化焓降低


包含机械键的聚合物具有独特而有用的特性。制备包含明确机械键的线性聚轮烷很困难，这使得确定机械键对线性聚轮烷性能的影响变得具有挑战性。我们公开了使用无环二烯复分解 （ADMET） 聚合合成具有可变密度的螺纹大环的 1,9-癸二烯-伪轮烷线性共聚物。这使我们能够研究大环螺纹如何影响线性聚伪轮烷的热机械性能。具体来说，我们观察到，随着我们增加伪轮烷单元的摩尔掺入，熔融焓从 67 J g-1 降低到 5 J ^g-1。展望未来，我们预计 ADMET 将成为一种有用的策略，可以在与表征其热机械性能相关的尺度上制备线性机械互锁大分子。