湿法纺丝制备的海藻纤维的结构及性能研究
首发时间:2013-11-12
摘要:本文以海藻酸钠(SA)为纺丝液,氯化钙溶液为凝固浴,分别考察了凝固浴温度,凝固浴浓度和牵伸比对海藻纤维形貌和力学性能的影响,同时表征了纤维的结构和热稳定性。结果表明,当凝固浴浓度为2.5%,凝固浴温度为30℃,牵伸比为1.5时,海藻纤维的拉伸强度和断裂伸长率均达到最大值,分别为18.90±0.90cN/tex和8.83±0.35%。红外谱图和热失重曲线均证实在海藻纤维内存在Ca2+,且与海藻酸结合形成蛋壳结构。此外,随着牵伸比的增加,海藻纤维的结晶性逐步提高,当牵伸比r=2时,结晶指数最大,为45.95%。与此同时,海藻纤维的拉伸强度逐步提高,而断裂伸长率则呈现先增加后逐步减小的趋势。
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Structure and properties of alginate fibers prepared by wet spinning
Abstract:With sodium alginate (SA) as spinning dope, calcium chloride solution as coagulation bath, to investigate the influence of calcium chloride solution temperature, calcium chloride solution concentration and draft ratios on the morphologies and mechanical properties of alginate fibers in this paper. Besides, the structure and thermal stabilities of alginate fibers were characterized at the same time. The results showed that, when the coagulation bath concentration was 2.5%, the coagulation bath temperature was 30℃ and the draft ratio was 1.5, alginate fibers showed optimal mechanical properties (tensile strength of 18.90±0.90cN/tex, elongation at break of 8.83±0.35%, respectively). The FTIR and TG results irrsulted that Ca2+ linked in the fiber, and formed egg-box with alginate monomeric unit. With the increasing of draft ratios, the crystalline was improved gradually, and when the draft ratio was 2, the maximum crystal index was obtained (45.95%). Meanwhile, the tensile strength increased gradually, while the elongation at break increased at first and then reduced.
Keywords: Alginate Fibers Technology Optimization Mechanical Properties Molecular Structure
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