Durable Cellulose-Sulfur Composites Derived from Agricultural and Petrochemical Waste
Durable Cellulose-Sulfur Composites Derived from Agricultural and Petrochemical Waste
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DOI：
10.1002/adsu.201900062
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发表时间：
2019-07-31
影响因子：
7.1
通讯作者：
Smith, Rhett C.
中科院分区：
文献类型：
--
作者：
Lauer, Moira K.;Estrada-Mendoza, Tatiana A.;Smith, Rhett C.
大自然提供了一整套丰富的结构图案，这些图案由复合材料组成，其机械性能超过了它们各自的组成部分。人类奋进从未得到充分重视的可持续来源的原料中同样制作增值结构材料仍然是一个巨大的挑战。本文中，努力通过硫和纤维素的协同组合来获得耐用的复合材料。实现了复合材料，其中本体硫通过与多硫化物链交联的1- 20质量%纤维素的网络增强。本文所述的复合材料是可再熔的并且具有超过波特兰水泥的抗弯强度。通过核磁共振、红外光谱、拉曼光谱、元素分析、热重分析、差示扫描量热法和动态力学分析对这些材料进行了彻底的分析。对制备的复合材料和分级材料的这些分析明确地验证了这些复合材料的配方和本体硫与增强聚硫化物交联纤维素网络的可分离性。这些可回收复合材料的热机械性能预示着它们在许多商业应用中取代固有的不可持续的结构元件的诱人潜力。还讨论了用硫-纤维素复合材料处理提高波特兰水泥的耐环境性和抗折强度的进一步应用。
Nature provides a rich panoply of structural motifs comprised of composites whose mechanical properties exceed those of their individual components. The human endeavor to likewise craft value-added structural materials from underappreciated, sustainably sourced feedstocks remains a formidable challenge. Herein, efforts are made to achieve durable composites by synergistic combination of sulfur and cellulose. Composites are achieved in which bulk sulfur is reinforced by a network of 1-20% by mass cellulose cross-linked with polysulfide chains. Composites described herein are remeltable and have flexural strength exceeding that of Portland cement. A thorough analysis of these materials has been undertaken through nuclear magnetic resonance, infrared spectroscopy, Raman spectroscopy, elemental analysis, thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis. These analyses of both as-prepared composites and fractionated materials unequivocally validate the formulation of these composites and the separability of the bulk sulfur from the reinforcing polysulfide-cross-linked cellulose network. The thermomechanical properties of these recyclable composites portend their tantalizing potential to supplant inherently unsustainable structural elements in numerous commercial applications. Further applications to improve the environmental resistance and flexural strength of Portland cement by treatment with the sulfur-cellulose composites are also discussed.