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A prerequisite for the effective transfer of the shape-memory effect to cotton fibers

机译：有效地将形状记忆效应转移到棉纤维上的前提条件

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摘要

Subtle interaction between shape-memory polymer and cellulose fibers within fabrics remains a critical issue for understanding their thermal-mechanical properties and thus the shape-memory behavior in cotton fibers. We demonstrate here the efficacy of Raman spectroscopy to probe the induced stresses in warp and weft fibers, presenting physicochemical features for cellulose fibers finished with macromolecule polyurethane and small-molecule dimethyloldihydroxyethyleneurea. Accordingly, a possible mechanism for transfer of the shape-memory effect to fabrics is proposed. Forming as a coating on the fiber surface after the finishing process, the shape-memory polymer takes a critical role in reducing the residual stress in weft fibers, establishing the prerequisite for reserving the shape-memory effect to fabric. In addition, this work has demonstrated that Raman spectroscopy is able to probe the residual stresses in cotton fabrics after being treated by chemicals in addition to that due to physical deformation. Our result provides clear evidence that in the finishing process strength reduction in fibers in general is not only caused solely by a chemical reaction, but also by a physical modification of the cotton structure.
机译：织物中的形状记忆聚合物和纤维素纤维之间的微妙相互作用仍然是理解棉织物的热机械性能并进而了解其形状记忆行为的关键问题。我们在这里证明拉曼光谱法探测经向和纬向纤维中的诱导应力的功效，为大分子聚氨酯和小分子二甲基二羟甲基羟基脲完成的纤维素纤维呈现理化特性。因此，提出了一种将形状记忆效应转移到织物上的可能机制。形状记忆聚合物在整理后形成为纤维表面的涂层，在降低纬纱纤维中的残余应力方面起着至关重要的作用，为保持织物的形状记忆效应奠定了先决条件。此外，这项工作证明了拉曼光谱能够探测经过化学处理的棉织物上的残余应力，以及由于物理变形引起的残余应力。我们的结果提供了明确的证据，即在整理过程中，纤维强度的降低通常不仅是由化学反应引起的，而且还是由棉结构的物理修饰引起的。

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