Abstract In the present study, the dissolution of softwood fibers and fabrication of all-cellulose composites was investigated using aqueous tetraethylammonium hydroxide solution (TEAOH, 35 wt%) at room temperature. The bulk of the cellulose fibers were instantly dissolved when mixed with the solvent, and suspensions up to 3 wt% were fabricated with ease. During the dissolution, a few remaining larger fiber flocks were fully dissolved within 3 h of mixing at room temperature. TEAOH was further studied in the production of all-cellulose composites by solvent welding (partial dissolution) of cellulose fiber sheets. Tensile strength of the original cellulose sheet increased from 3.3 to 55.0 MPa only after 30 s of room-temperature solvent welding, and an increase of over 23-fold (up to 76.7 MPa) was obtained by high-pressure-aided hot-pressing of the partially dissolved sheets before drying. The demonstrated fabrication of all-cellulose composites yielded many benefits in comparison to the current dissolution systems, such as short treatment time, ambient operation conditions, and readily applicable processing solutions, which makes it a potential methodology applicable even at an industrial scale.

中文翻译：

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基于水性溶剂的溶剂焊接快速制备全纤维素复合材料

摘要 在本研究中，使用四乙基氢氧化铵水溶液（TEAOH，35 wt%）在室温下研究了针叶木纤维的溶解和全纤维素复合材料的制备。当与溶剂混合时，大部分纤维素纤维立即溶解，并且可以轻松制造高达 3 wt% 的悬浮液。在溶解过程中，在室温下混合 3 小时内，剩余的一些较大的纤维团完全溶解。在通过纤维素纤维片的溶剂焊接（部分溶解）生产全纤维素复合材料中进一步研究了 TEAOH。原纤维素片材的拉伸强度仅在室温溶剂焊接 30 s 后从 3.3 MPa 增加到 55.0 MPa，增加了 23 倍以上（高达 76.0 MPa）。7 MPa) 是通过在干燥前对部分溶解的片材进行高压辅助热压而获得的。与当前的溶出系统相比，全纤维素复合材料的证明制造产生了许多好处，例如处理时间短、环境操作条件和易于应用的处理解决方案，这使其成为一种潜在的方法，即使在工业规模上也适用。