TY  - EJOU
AU  - Jia, Liting 
AU  - Han, Xiao 
AU  - Qiao, Cuixia 
AU  - Zhao, Gang 
AU  - Xia, Yanzhi 
AU  - Xue, Zhixin 

TI  - Carrageenan Fiber Prepared by a New Process Route of Ba<sup>2+</sup> Ion Pre-Crosslinking in the Spinning Solution
T2  - Journal of Renewable Materials

PY  - 2024
VL  - 12
IS  - 3
SN  - 2164-6341

AB  - Ba<sup>2+</sup> pre-crosslinked carrageenan fiber (Ba/CAF) was prepared by adding a small amount of Ba<sup>2+</sup> 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 BaCl<sub>2</sub> solution (combine B) and low concentration BaCl<sub>2</sub> solution (combine C), as coagulation bath and stretch bath, respectively. The combination of coagulation bath and stretch bath suitable for Ba<sup>2+</sup> pre-crosslinking wet spinning was screened. The results showed that Ba<sup>2+</sup> can induce the birefringence of the CA molecular chain, and the Ba<sup>2+</sup> 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% BaCl<sub>2</sub> solution and stretch bath of 1.7 wt% BaCl<sub>2</sub> solution, that is, combination C with low concentration BaCl<sub>2</sub> 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.
KW  - Carrageenan fiber; Ba<sup>2+</sup> ion; pre-crosslinking; wet spinning; flame retardancy

DO  - 10.32604/jrm.2023.044310