Citation: Jing-jing Liu, Zhi-xin Xue, Miao Yan, Quan-yi Zhang, Yan-zhi Xia. Effect of Post-treatment on the Properties of Agar Fibers[J]. Acta Polymerica Sinica, ;2018, 0(10): 1345-1350. doi: 10.11777/j.issn1000-3304.2018.18029 shu

Effect of Post-treatment on the Properties of Agar Fibers

College of Chemistry and Chemical Engineering, Institute of Marine Biobased Materials, State Key Laboratory of Biopolysaccharide Fibers and Ecological Textiles, Qingdao University, Qingdao 266071

Corresponding author: Zhi-xin Xue, xuezhixin@qdu.edu.cn Yan-zhi Xia, xyz@qdu.edu.cn
Received Date: 24 January 2018
Revised Date: 28 April 2018
Available Online: 6 September 2018

In recent years, both academia and industry have focused their efforts on better utilization of natural fibers and synthetic bio-based fibers. Agar, extracted from red algae, has good biocompatibility, excellent moisturizing ability and biodegradability. Agar fibers were usually fabricated via wet spinning by extruding agar solution into a barium chloride coagulation bath due to the unique gel properties of agar. However, the phenomenon of " fibers bundle adhesion” and the mechanical properties of agar fibers need to be improved. In this study, we use different post-processing solutions (amino silicones and sodium tetraborate) to get excellent agar fibers. The structures, mechanical properties and thermal properties of the agar fibers ontained were evaluated by scanning electron microscopy (SEM), single fiber tensile strength tester, contact angle tester, thermogravimetric tester, and Fourier transform infrared spectroscopy (FTIR). The results show that the phenomenon of " fibers bundle adhesion” disappeared whether agar fibers were immersed in amino silicones or sodium tetraborate. Agar fibers immersed in amino silicones form a hydrophobic film on the surface, therefore, the contact angle increased to 106.4°. The linear intensity increased to 0.69 cN/dtex and the elongation at break increased to 104.89% when the agar fibers were immersed in amino silicones. The contact angle decreased to 68.3° while the agar fibers were immersed in sodium tetraborate because their surface became rough and the mechanical strength decreased. However, the agar fibers immersed in sodium tetraborate showed a certain degree of flame retardancy. The results of limit oxygen index (LOI) indicate that the agar fibers immersed in sodium tetraborate were combustible while the agar fibers were flammable by thermogravimetric test. The change of chemical structure of the agar fibers by different post-processing was analyzed by FTIR. Owing to excellent biological properties and outstanding moisturizing capacity, it still requires further study to accelerate the development of these agar products.
- Agar fibers,
- Surface modification,
- Amino silicones,
- Sodium tetraborate
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