Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (02): 8-13.doi: 10.13475/j.fzxb.20180907006

• Fiber Materials • Previous Articles     Next Articles

Preparation of chemically cross-linked modified sodium alginate/krill protein composite fiber

YAO Qiang, GUO Jing(), WU Jing   

  1. School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, Liaoning 116034, China
  • Received:2018-09-27 Revised:2018-11-09 Online:2019-02-15 Published:2019-02-01
  • Contact: GUO Jing E-mail:guojing8161@163.com

Abstract:

In order to enhance the comprehensive performance of sodium alginate/krill protein (SA/AKP) composite fiber, boric acid (H3BO3) was used as a crosslinking agent to crosslink and modify the fiber so as to prepare high-performance SA/AKP composite fiber. The interaction between optimal crosslinking temperature and molecules of the composite system was investigated. The thermal stability, mechanical properties and dynamic mechanical properties of the modified fiber were characterized. The results show that boric acid has an obvious effect on the intermolecular hydrogen bonds in the sodium alginate/krill protein composite system. Boric acid molecules and hydroxyl groups on the sodium alginate molecular chain are subjected to a dehydration condensation reaction to realize cross-linking, and the cross-linking temperature is 80 ℃, With the increase of boric acid content, the change in the thermal stability of the composite fiber is small, and the mechanical properties and storage modulus gradually increase. When the content of H3BO3 in the system is 1.5 g/L, the breaking strength of the fiber increases up to 2.58 cN/dtex, which is improved by 11.3% compared with the SA/AKP composite fiber before modification.

Key words: composite fiber, boric acid, sodium alginate, krill protein, crosslinking modification

CLC Number: 

  • TQ340.41

Fig.1

Enhancement mechanism of SA/AKP composite fiber"

Fig.2

Relationship between viscosity and temperature of SA/AKP (a) and H3BO3/SA/AKP (b) composite solution"

Fig.3

Infrared spectra of SA and AKP"

Fig.4

Infrared spectra of different boric acid composite"

Tab.1

Fitting results of various hydrogen bond types"

氢键类型 0 g/L 0.5 g/L 1 g/L 1.5 g/L
波数/
cm-1
峰面
氢键
比例/
%
波数/
cm-1
峰面
氢键
比例/
%
波数/
cm-1
峰面
氢键
比例/
%
波数/
cm-1
峰面
氢键
比例/
%
自由羟基 —OH 3 603 2.05 1.3 3 607 2.03 1.6 3 611 3.10 1.9 3 594 2.28 1.7
分子间氢键 OH…π 3 530 51.80 65.6 3 530 45.95 57.3 3 531 56.51 67.7 3 525 50.90 58.6
OH…醚氧 3 329 37.15 3 298 16.97 3 299 26.66 3 296 20.08
分子内氢键 OH…N 3 145 11.50 33.1 3 146 11.56 41.1 3 145 25.21 30.4 3 125 9.64 39.7
OH…OH 3 412 25.86 3 409 40.34 3 407 42.55 3 408 43.21
OH 环状
多聚体
3 221 24.75 3 227 13.01 3 225 6.15 3 220 11.55

Tab.2

Mechanical properties of SA/AKP composite fibers"

样品 硼酸质
量浓度/
(g·L-1)
断裂
强度/
(cN·dtex-1)
断裂
伸长
率/%
断裂
强力/
cN
初始
模量/
(cN·dtex-1)
SA/AKP 0.0 2.35 4.70 118.50 60.74
H3BO3/SA/AKP 0.5 2.43 5.24 121.52 43.00
1.0 2.54 7.40 127.91 57.54
1.5 2.58 9.20 246.60 49.13

Fig.5

DSC curve of SA/AKP composite fibers with different H3BO3 contents"

Fig.6

DMA curve of SA(a) and SA/AKP(b) composite fiber"

Fig.7

Storage modulus curve of SA/AKP composite fiber with different H3BO3 content"

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