Effects of Alkalization on Physical and Mechanical Properties of Biologically Degummed Okra Bast and Corn Husk Fibers

ABSTRACT

In this study, biologically degummed okra bast and corn husk fibers were subjected to alkalization processes. Alkalization treatments resulted in decrease of linear density of the biologically degummed fibers. Increment in alkali concentration resulted in an initial increase then a successive decrease in all tensile indicators: initial modulus, breaking tenacity and breaking elongation. 3 g/L NaOH-treated fibers showed the best tensile characteristics for both okra bast and corn husk fibers. The IR spectra analysis suggested elimination of extracellulosic materials upon alkaline treatment. The ranges for properties of the produced okra bast and corn husk fibers can be summarized in consecutive order as linear density of 9.7–12.3 and 20.0–24.3 tex; initial modulus between 1257-1897 and 156.4–354.6 cN/tex; breaking tenacity range in 28.0–46.8 and 6.37–15.2 cN/tex; and elongation in the range 2.0–2.5% and 8.7–19.9%. The properties of obtained okra bast fibers are found to be superior to corn husk fibers and comparable to that of conventional bast fibers.

摘要

在本研究中，生物脱胶的秋葵皮和玉米壳纤维进行碱化处理. 碱化处理导致生物脱胶纤维线密度降低. 碱浓度的增加导致所有拉伸指标的初始增加，然后连续降低: 初始模量、断裂韧度和断裂伸长率. 3g/L NaOH处理纤维对秋葵皮和玉米壳纤维的拉伸性能最好. 红外光谱分析表明，碱处理可消除细胞外物质. 所制备的黄秋葵皮和玉米壳纤维的性能范围可归纳为线性密度为9.7-12.3和20.0-24.3 tex初始模量在1257-1897和156.4-354.6 cN/tex之间断裂韧性范围为28.0–46.8和6.37–15.2 cN/tex伸长率范围为2.0–2.5%和8.7–19.9%. 所得黄秋葵韧皮纤维的性能优于玉米壳纤维，与常规韧皮纤维相当.

KEYWORDS:

• Agricultural residue
• alkalization
• biocomposite
• biological degumming
• corn husk fiber
• natural fiber
• okra bast fiber

关键词:

• 农残
• 碱化
• 生物复合
• 生物脱胶
• 玉米壳纤维
• 天然纤维
• 秋葵韧皮纤维

Additional information

Funding

This work was supported by the TUBITAK [BIDEB 2221]; Pamukkale Üniversitesi [2014HZL001].