Biodegradable polyurethane based clay composite and their anti-biofouling properties
Biodegradable polyurethane based clay composite and their anti-biofouling properties
复制标题
可生物降解聚氨酯基粘土复合材料及其抗生物污损性能
DOI：
10.1016/j.colsurfa.2021.126946
复制
发表时间：
2021-06-07
影响因子：
5.2
通讯作者：
Zhang, Qinghua
中科院分区：
文献类型：
--
作者：
Ali, Abid;Xiao, Yue;Zhang, Qinghua
微小海洋生物在与海水直接相连的船体上的定殖是一个代价高昂的问题。生物污垢有助于增强流体动力阻力，从而导致更高的燃料消耗和温室气体排放。因此，环境友好的溶液对于抗生物污损活性是非常必要的。为此，我们合成了由ε-CL和4，4 '-亚甲基双（环己基异氰酸酯）（H12 MDI）和1，4-丁二醇（1，4-BD）组成的可生物降解聚氨酯（CL-PU）。合成的CL-PU进一步与4，5-二氯-2-辛基异噻唑酮（DCOIT）和粘土通过混合溶液进行改性，制备复合材料。结果表明，由于粘土的存在，CL-PU/DCOIT/粘土复合材料在人工海水、酶解液和海水中均发生降解。通过偏光显微镜（POM）和差示扫描量热法（DSC）测定，由于粘土的存在减小了复合材料中聚己内酯（PCL）球晶的尺寸，从而显著提高了复合材料的结晶度。该复合材料作为防污剂（DCOIT）的载体，控制其释放速率。抑菌和抑藻实验表明，含DCOIT的复合材料对大肠杆菌（Escherichia coli，E.coli）和海洋硅藻不定舟形藻（Navicula incerta，82.5%）的生长有明显的抑制作用（抑制区域为14 mm）。可降解的CL-PU/DCOIT/粘土复合材料将具有巨大的耐久性和优异的抗海洋生物污损的防污活性，由于可持续性和可调节性，而不会对水生生物群有毒。
The colonization of tiny marine organisms on ship's hull which are connected directly from seawater, is a costly issue. Biofouling contributes to enhanced hydrodynamic drag, which leads to higher consumption of fuel and greenhouse gas emissions. Therefore, the environment-friendly solution is very necessary for anti-biofouling activity. For this purpose, we have synthesized biodegradable polyurethane (CL-PU) composed of epsilon-CL and 4,4'-methylenebis(cyclohexyl isocyanate) (H12MDI) and 1,4 butanediol (1,4 BD). The synthesized CL-PU was further modified with 4, 5-dicholoro-2-octyl-isothiazolone (DCOIT) and clay by mixing of the solution to make composites. Our study showed that CL-PU/DCOIT/clay composite degraded in the artificial seawater (ASW), enzymatic solution and seawater (through laboratory test) due to the contents of clay. Because the existence of clay reduced the size of the spherulite of polycaprolactone (PCL) in the composite, therefore remarkably improved the crystallinity as determined via the polarizing optical microscope (POM) and differential scanning calorimetry (DSC). The composite acted as carrier of antifoulant (DCOIT) and controlled their release rate. The anti-bacterial and anti-diatom experiments exhibited that the composite with DCOIT contents were effective in preventing the accretion of Escherichia coli (E.coli) (region inhibition 14 mm) and marine diatom Navicula incerta (82.5% reduction). The degradable CL-PU/DCOIT/clay composite will have tremendous durability and excellent anti-fouling activity for marine biofouling owning to sustainability and tunability without being toxic to aquatic biota.