以海藻酸钠(SA)为原料,以羧基化多壁碳纳米管(cMWCNTs)为改性剂,再通过涂敷浸渍的方法与热塑性聚氨酯(TPU)导电无纺布复合得到改性SA阳离子交换膜。利用热失重分析仪(TG)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、绝缘电阻测试仪和万能材料试验机对SA阳离子膜的结构和性能进行表征。结果表明:与SA阳离子交换膜相比,经cMWCNTs和TPU导电无纺布改性后膜的电阻率显著降低,导电能力提高;改性SA阳离子膜的表面平整、光滑,未出现气泡等缺陷,TPU导电无纺布与SA膜间界面结合力较强;改性后,膜的热稳定性和力学性能得到显著提高。
The modified sodium alginate (SA) cation-exchange membrane was prepared,using SA as raw material and cMWCNTs as modifier,then being composited with conductive thermoplastic polyurethane (TPU) nonwoven fabric by a coating and dipping method.The structure and properties of the membranes were characterized by thermogravimetric analyzer(TG),scanning electron microscope(SEM),X-ray diffractometer(XRD),insulation resistance tester and universal material testing machine.The results shown that:compared with SA cation-exchange membrane,the electrical resistivity of SA membrane was significantly decreased after being modified by cMWCNTs and conductive TPU nonwoven fabric,resulting in improved electrical conductivity of the SA membrane.The surface of the modified SA membrane was smooth with no defects and bubbles,the interface between the TPU conductive nonwoven fabric and the SA membrane was strong.Both the thermal stability and the mechanical properties of the membrane were also improved after modification.
[1] Chen R Y,Chen Z,Zheng X,et al.Preparation and characterization of mSA/mCS bipolar membranes modified by CuTsPc and CuTAPc[J].Journal of Membrane Science,2010,355(1-2):1-6.
[2] Shi S Y,Pan Y M,Lu B,et al.Preparation and characterization of a bipolar membrane modified by copper phthalocyanine 16-carboxylic acid and acetyl ferrocene[J].Journal of Macromolecular Science,Part B:Phys,2014,53(8):1431-1441.
[3] 李爱玉,王三反,宋小三,等.离子交换膜的制备及发展趋势研究[J].环境科学与管理,2017,42(5):102-105.
[4] 石素宇.功能高分子膜的制备及在电合成中的应用[D].福州:福建师范大学,2010.
[5] 张学敏,王三反,周键.改性离子交换膜抗污染性能研究进展[J].工业水处理,2016,36(8):16-19.
[6] 李健,徐燕青,阮慧敏,等.单价选择性阳离子交换膜的研究进展[J].膜科学与技术,2015,35(3):113-120.
[7] 黄全江.等离子体表面接枝及涂覆改性阳离子交换膜[D].兰州:兰州交通大学,2017.
[8] 穆永信,王三反,吴楠.阳离子交换膜改性的研究进展[J].水处理技术,2013,39(6):5-7.
[9] 刘彦峰.离子膜选择透过机理分析及膜表面涂层、粒子镶嵌改性研究[D].兰州:兰州交通大学,2016.
[10] Hosseini M,Madaeni S S,Khodabakhshi A R,et al.Preparation andsurface modification of PVC/SBR heterogeneous cation exchangemembrane with silver nanoparticles by plasma treatment[J].Journalof Membrane Science,2010,365(1-2):438-446.
[11] 吴慧玲,张淑平.海藻酸钠纳米复合材料的研究进展[J].化工进展,2014,33(4):954-959.
[12] 王孝华.海藻酸钠的提取及应用[J].重庆工学院学报,2007,21(5):124-128.
[13] 谢平.海藻酸及其盐的食用和药用价值[J].开封医专学报,1997(4):28-31.
[14] 张学良.海藻酸钠及其衍生物电纺纳米纤维制备和性质研究[D].海口:海南大学,2012.
[15] 刘袖洞,于炜婷,王为,等.海藻酸钠和壳聚糖聚电解质微胶囊及其生物医学应用[J].化学进展,2008,20(1):126-139.
[16] 陆敏,王利强.海藻酸钠纳米微球抗菌膜的制备及抑菌作用研究[J].功能材料,2018,49(3):3076-3081.
[17] 石素宇,任家华,王利娜,等.热塑性聚氨酯导电无纺布改性壳聚糖阴离子交换膜的制备及表征[J].化工新型材料,2019,47(2):136-139.
