摘要
海藻纤维的断裂强度低、伸长率差一直是限制其广泛应用的主要原因。针对该问题,对海藻纤维进行改性,将纳米蒙脱土(MMT)与海藻酸钠共混制备纺丝原液,以CaCl_(2)为凝固浴,通过湿法纺丝法制备海藻酸纳/纳米蒙脱土纤维,借助透射电子显微镜、扫描电子显微镜、红外光谱仪、X射线衍射仪和热重分析仪等对其微观形貌及结构进行表征与分析,通过单纤维强力仪测试其断裂强度、断裂伸长率等物理力学性能及热稳定性,研究蒙脱土溶胀时间及添加量对其性能的影响。结果表明:当MMT溶胀120 h、质量分数为0.1%时,MMT在纺丝液中分布较为均匀;与纯海藻纤维的力学性能相比,改性后纤维的断裂强度由1.32 cN/dtex提高到3.01 cN/dtex,提高率高达228%;断裂伸长率由4.67%增加到10.07%,同时MMT的加入没有明显改变海藻纤维的化学结构与结晶结构,对纤维的热稳定性能有一定的提高。
Objective The poor breaking strength and elongation at break are the main reasons that limit the wide applications of alginate fibers.Many approaches such as cross-linking,grafting and blending modifications have been developed to improve the physical and mechanical properties of alginate fibers.In this research,the reinforcing mechanisms of montmorillonite(MMT)were studied,and nano MMT was blended into sodium alginate(SA)solution to prepare modified calcium alginate(CA)fibers using wet spinning technique aiming to improve the mechanical properties of the alginate fibers.Method Montmorillonite(MMT)suspension was blended with sodium SA aqueous solution to prepare the mixed spinning solution,before the SA/MMT fibers were prepared by wet spinning method using CaCl_(2) solution as the coagulation bath.The microscopic morphologies and structural characteristics of the prepared fibers were characterized by using TEM,SEM,FT-IR,XRD and the mechanical properties and thermal stabilities of different fibers were tested by using single fiber tensile tester and thermogravimetric analyzer respectively to study the influences of different swelling time and contents of MMT on the corresponding fiber properties.Results The layer distance of MMT was increased desirably after swelling for 120 h,and the swollen MMT was well dispersed in the spinning solution,which provided favorable conditions for SA to get into the macromolecular layers of MMT and eventually peel off the layers of MMT.The breaking strength of the CA/MMT fibers containing 0.1%MMT that swelled for 120 h was the best.This phenomenon is owing to the intercalation of SA into the uniformly dispersed MMT in the spinning solution,which is conducive to the combination of MMT and SA.Meanwhile,the result of the elongation at break was similar to that of the breaking strength of fibers,which could be explained that the formed hydrogen bonds among the hydroxyl groups on MMT and the ionized carboxyl groups on SA were conductive to overcoming stress concentration and increasing t
作者
胥家辉
郭肖青
王伟
王怀芳
张传杰
宫兆庆
XU Jiahui;GUO Xiaoqing;WANG Wei;WANG Huaifang;ZHANG Chuanjie;GONG Zhaoqing(College of Textile&Clothing,Qingdao University,Qingdao,Shandong 266071,China;Weihai Innovation Institute of Qingdao University,Weihai,Shandong 264200,China;Weihai Textile Functional Additives Engineering Technology Center,Weihai,Shandong 264500,China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2024年第6期16-22,共7页
Journal of Textile Research
基金
山东省自然科学基金项项目(ZR2022QE182)。
关键词
蒙脱土
海藻纤维
增强增韧
插层
海藻酸钠
湿法纺丝
montmorillonite
alginate fiber
strengthening and toughening
intercalation
sodium alginate
wet spinning
