化学交联改性海藻酸钠/磷虾蛋白复合纤维的制备

doi:10.13475/j.fzxb.20180907006

摘要/Abstract

摘要：

为增强海藻酸钠/磷虾蛋白(SA/AKP)复合纤维的综合性能,以硼酸为交联剂对海藻酸钠/磷虾蛋白复合纤维进行交联改性,探究了复合体系的最佳交联温度和分子间相互作用,并对改性纤维的热稳定性、力学性能和动态力学性能等进行表征。结果表明:硼酸对海藻酸钠/磷虾蛋白复合体系中分子内氢键具有明显的影响,硼酸分子与海藻酸钠分子链上的羟基发生脱水缩合反应实现交联,交联温度为80 ℃;随着硼酸加入量的增加,复合纤维的热稳定性变化不大,力学性能和储能模量逐渐提高,当体系中硼酸的质量浓度为1.5 g/L时,纤维的断裂强度有所提高,达到2.58 cN/dtex,比改性前提高了11.3%。

关键词: 复合纤维, 硼酸, 海藻酸钠, 磷虾蛋白, 交联改性

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

中图分类号:

TQ340.41

姚强, 郭静, 吴静. 化学交联改性海藻酸钠/磷虾蛋白复合纤维的制备[J]. 纺织学报, 2019, 40(02): 8-13.

YAO Qiang, GUO Jing, WU Jing. Preparation of chemically cross-linked modified sodium alginate/krill protein composite fiber[J]. Journal of Textile Research, 2019, 40(02): 8-13.

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氢键类型		0 g/L			0.5 g/L			1 g/L			1.5 g/L
氢键类型		波数/ cm^-1	峰面积	氢键比例/ %	波数/ cm^-1	峰面积	氢键比例/ %	波数/ cm^-1	峰面积	氢键比例/ %	波数/ cm^-1		峰面积	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
分子间氢键	OH…醚氧	3 329	37.15	65.6	3 298	16.97	57.3	3 299	26.66	67.7	3 296	20.08		58.6
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

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