Abstract

The use of agricultural waste and residues in composite materials is a potential high-value commercial application for underutilized renewable resources and provides alternative commercial markets to the agricultural industry. Cotton gin trash (CGT) and cotton gin motes (CGM) are underutilized low-value commodities that are attractive targets due to their high cellulose content; however, each contains various amounts of lignin, hemicellulose and other components that impede their utilization as commercial products. In this work, lignin-containing cellulose nanofibers (LCNFs) with gradient degrees of lignin content were prepared from CGT and CGM. Analyses showed the lignin content and other components affected the physical properties of LCNFs, modestly altering their thermal stability and crystallinity. The degree of polymerization (DP) was smaller after successive rounds of processing and was also dependent upon the source (CGT or CGM) with CGT providing nanofibers with a smaller DP than CGM. This translated into slightly different suspension viscoelastic behavior as determined by rheological measurements.

Graphic abstract

中文翻译：

---

从轧花碎屑和轧花碎屑获得的具有梯度木质素含量的含木质素纤维素纳米纤维

摘要

在复合材料中使用农业废料和残留物是利用不足的可再生资源的潜在高价值商业应用，并为农业提供了替代性商业市场。轧棉机垃圾（CGT）和轧棉机微粒（CGM）是利用率低的低价商品，由于其纤维素含量高，因此很有吸引力。但是，每种都包含各种量的木质素，半纤维素和其他成分，这阻碍了它们用作商业产品。在这项工作中，由CGT和CGM制备了具有木质素含量梯度的含木质素纤维素纳米纤维（LCNF）。分析表明，木质素含量和其他成分影响了LCNF的物理性能，适度地改变了它们的热稳定性和结晶度。经过连续几轮加工后，聚合度（DP）较小，并且还取决于来源（CGT或CGM），而CGT提供的纳米纤维的DP值要小于CGM。如通过流变学测量所确定的，这转化为稍微不同的悬浮液粘弹性行为。

图形摘要