Multi-scale thermal stability of a hard thermoplastic protein-based material.
Multi-scale thermal stability of a hard thermoplastic protein-based material.
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DOI：
10.1038/ncomms9313
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发表时间：
2015-09-21
影响因子：
16.6
通讯作者：
Masic A
中科院分区：
文献类型：
--
作者：
Latza V;Guerette PA;Ding D;Amini S;Kumar A;Schmidt I;Keating S;Oxman N;Weaver JC;Fratzl P;Miserez A;Masic A
虽然热塑性材料主要来自石油化学品，但从可持续发展的角度来看，用可再生的生物聚合物来生产热塑性材料是非常可取的。不幸的是，表现出热塑性行为并在加工后保持其机械性能的生物聚合物基本上是不存在的。鱿鱼和墨鱼坚固的吸盘环齿(SRT)是热塑性生物聚合物的一个显著例外。在这里，我们描述了通过纤维的热挤压热塑性加工鱿鱼SRT，展示了这些材料的潜在的适合大规模热成形。利用高分辨率的原位X射线衍射和振动光谱，我们阐明了导致这一行为的分子和纳米尺度的特征，并表明SRT由半结晶聚合物组成，由此嵌入在非晶基质中的耐热纳米晶β片层被组织成六方堆积的纳米纤维晶格。这项研究为基于仿生蛋白质和多肽的热塑性结构生物聚合物的分子设计提供了关键的见解，这些生物聚合物具有潜在的生物医学和3D打印应用。鱿鱼和墨鱼的吸盘环齿是热塑性生物聚合物的罕见例子。在这里，作者演示了如何处理这些材料，以便在生物医学和3D打印应用中实现。
Although thermoplastic materials are mostly derived from petro-chemicals, it would be highly desirable, from a sustainability perspective, to produce them instead from renewable biopolymers. Unfortunately, biopolymers exhibiting thermoplastic behaviour and which preserve their mechanical properties post processing are essentially non-existent. The robust sucker ring teeth (SRT) from squid and cuttlefish are one notable exception of thermoplastic biopolymers. Here we describe thermoplastic processing of squid SRT via hot extrusion of fibres, demonstrating the potential suitability of these materials for large-scale thermal forming. Using high-resolution in situ X-ray diffraction and vibrational spectroscopy, we elucidate the molecular and nanoscale features responsible for this behaviour and show that SRT consist of semi-crystalline polymers, whereby heat-resistant, nanocrystalline β-sheets embedded within an amorphous matrix are organized into a hexagonally packed nanofibrillar lattice. This study provides key insights for the molecular design of biomimetic protein- and peptide-based thermoplastic structural biopolymers with potential biomedical and 3D printing applications. Sucker ring teeth from squid and cuttlefish represent rare examples of thermoplastic biopolymers. Here, the authors demonstrate how these materials may be processed for implementation in biomedical and 3D printing applications.