ABSTRACT

In this paper, the capillary rise and sorption ability of hemp fibers oxidized with hydrogen peroxide and potassium permanganate were studied, with the aim to get more insight into the changes in the structure of hemp fibers caused by oxidation, and to compare the influence of applied oxidative agents on hemp fibers. Capillary rise was presented as a function of a liquid rise height vs times, with determined all three capillary coefficients, while sorption ability was determined as water retention values and moisture sorption. For structural analysis of the samples the ATR-FTIR technique was used. Also, the amount of aldehyde and carboxyl groups and the lignin content in oxidized fibers were determined. The surface fibers morphology was observed by FESEM. In all oxidized hemp fibers an increase in capillarity was obtained for both oxidizing agents (33–75 mm for H₂O₂, and 40–114 mm for KMnO₄), compared to 31 mm for unmodified fibers, but decreased sorption ability. Application of both oxidative agents, were successful for introduction of functional groups into oxidized fibers, for reduction of the amount of non-cellulosic substances, as well as moisture sorption. Simultaneously, the fibers became finer, cleaner, whiter, softer and more suitable for further processing, while, generally, higher influence on changes into oxidized hemp fibers was achieved by oxidation with KMnO₄, compared to oxidation with H₂O₂.

摘要

本文研究了过氧化氢和高锰酸钾氧化的大麻纤维的毛细上升和吸附能力，旨在更深入地了解氧化引起的大麻纤维结构变化，并比较应用的影响。大麻纤维上的氧化剂。毛细上升呈现为液体上升高度与时间的函数，确定了所有三个毛细系数，而吸附能力被确定为保水值和水分吸附。对于样品的结构分析，使用了 ATR-FTIR 技术。此外，还测定了氧化纤维中的醛基和羧基的量以及木质素的含量。通过FESEM观察表面纤维形态。₂ O _{2和 KMnO 4}为 40-114 mm ），而未改性纤维为 31 mm，但吸附能力降低。两种氧化剂的应用，成功地将官能团引入氧化纤维，减少非纤维素物质的量，以及吸湿。_{同时，纤维变得更细、更清洁、更白、更柔软，更适合进一步加工，而与用 H 2} O ₂氧化相比，用 KMnO ₄氧化通常对转变为氧化大麻纤维的影响更大。