Open Access

ARTICLE

Carrageenan Fiber Prepared by a New Process Route of Ba²⁺ Ion Pre-Crosslinking in the Spinning Solution

Liting Jia¹, Xiao Han¹, Cuixia Qiao², Gang Zhao², Yanzhi Xia¹, Zhixin Xue^1,*

1 School of Chemistry and Chemical Engineering, State Key Laboratory of Bio-Fibers and Eco-Textiles, Marine Fiber New Material Institute, Qingdao University, Qingdao, 266071, China
2 Department of Traditional Chinese Medicine, The Affiliated Hospital of Qingdao University, Qingdao, 266000, China

* Corresponding Author: Zhixin Xue. Email:

Journal of Renewable Materials 2024, 12(3), 427-441. https://doi.org/10.32604/jrm.2023.044310

Received 27 July 2023; Accepted 17 October 2023; Issue published 11 April 2024

Abstract

Ba²⁺ pre-crosslinked carrageenan fiber (Ba/CAF) was prepared by adding a small amount of Ba²⁺ to the carrageenan (CA) solution as the spinning solution. Ba/CAF-n/A, Ba/CAF-n/B and Ba/CAF-n/C were prepared with ethanol solution (combine A), high concentration BaCl₂ solution (combine B) and low concentration BaCl₂ solution (combine C), as coagulation bath and stretch bath, respectively. The combination of coagulation bath and stretch bath suitable for Ba²⁺ pre-crosslinking wet spinning was screened. The results showed that Ba²⁺ can induce the birefringence of the CA molecular chain, and the Ba²⁺ pre-crosslinking effect is the best when the CA mass fraction is 8.0 wt%. From the perspective of production safety, fiber performance and spinning cost, the coagulation bath of 3.5 wt% BaCl₂ solution and stretch bath of 1.7 wt% BaCl₂ solution, that is, combination C with low concentration BaCl₂ solution, is the best choice. Ba/CAF-8.0/C was obtained under the best conditions. The linear intensity, water absorption and flame retardancy study showed that the breaking strength of Ba/CAF-8.0/C is as high as 1.61 cN/dtex, the water absorption was 649.2% and 574.3%, in deionized water and normal saline, respectively, and the LOI value reached 32.

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