摘要
为了提高海藻酸钠(SA)纤维的断裂强度和断裂伸长率,以丙烯酸(AA)为化学交联组分,SA为离子交联组分,聚乙烯醇(PVA)为微晶交联组分,采用湿法纺丝和冻融循环方法制备含有PVA微晶交联点和海藻酸钠/聚丙烯酸(SA/PAA)双网络结构的海藻酸钠/聚丙烯酸/聚乙烯醇(SA/PAA/PVA)复合纤维。通过流变性能、力学性能、红外光谱、X射线衍射仪(XRD)和扫描电子显微镜(SEM)测试研究了交联剂N,N-亚甲基双丙烯酰胺(MBA)含量和PVA微晶交联对SA/PAA/PVA纺丝原液和复合纤维的结构与性能的影响。结果表明,当MBA质量分数为0. 5%时,纺丝原液的损耗模量(G″)最小,可纺性最好,复合纤维的断裂强度达到2. 83 cN/dtex,断裂伸长率达到9. 38%,比再生SA纤维分别提高了15. 98%和38. 96%;PVA冷冻之后形成微晶交联点并且PAA和PVA已经复合到体系中;PAA和PVA的加入提高了复合纤维的结晶度;复合纤维的表面形貌趋于光滑和规整,纤维断面更加致密。
In order to improve the breaking strength and elongation at break of sodium alginate( SA) fiber,acrylic acid( AA) was used as chemical crosslinking component,SA was used as ion crosslinking component,and polyvinyl alcohol( PVA) was used as microcrystalline crosslinking group. The sodium alginate/polyacrylic acid/polyvinyl alcohol( SA/PAA/PVA) composite fiber containing PVA microcrystalline cross-linking point and SA/PAA double network structure was prepared by wet spinning and freeze-thaw cycle method. The effects of cross-linking agent N,N-methylenebisacrylamide( MBA) content and PVA microcrystalline cross-linking on the structure and properties of SA/PAA/PVA spinning dope and composite fiber were studied by rheological properties,mechanical properties,infrared spectroscopy,X-ray diffractometer( XRD) and sweeping electron microscope( SEM) tests. The results showed that when the MBA content is 0. 5%,the loss modulus( G″) of the spinning dope is the smallest and the spinnability is the best. The breaking strength of the composite fiber reached 2. 83 cN/dtex,and the elongation at break reached 9. 38%,which was 15. 98% and 38. 96% higher than that of the regenerated SA fiber. PVA formed a microcrystalline cross-linking point after freezing and PAA and PVA had been compounded into the system. The crystallinity of composite fibers increased after joining PAA and PVA. The surface morphology of the composite fiber tends to be smooth and regular,and the fiber cross section is more dense.
作者
闫铭
周炜东
张鸿
石军峰
赵云鹤
叶泳铭
郭静
于跃
YAN Ming;ZHOU Weidong;ZHANG Hong;SHI Junfeng;ZHAO Yunhe;YE Yongming;GUO Jing;YU Yue(School of Textile and Materials Engineering,Dalian Polytechnic University,Dalian 116024,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第2期349-357,共9页
Chemical Journal of Chinese Universities
基金
辽宁省教育厅基础研究项目(批准号:J2019018)
辽宁省高等学校产业技术研究院重大项目(批准号:2018LY010)
大连市科技创新基金项目(批准号:2019J12GX047)资助~~
关键词
海藻酸钠
SA/PAA双网络
微晶交联
聚乙烯醇
Sodium alginate
SA/PAA double network
Microcrystalline cross-linking
Polyvinyl alcohol
作者简介
联系人:张鸿,女,博士,教授,主要从事纤维成型与改性及功能与智能高分子材料研究.E-mail:zhang_hong1234@sina.com。
