甲基硅酸钠刻蚀聚多巴胺涂层构建超疏水木材及表征

易泽德; 廖木荣; 康帆; 赵波; 秦志永

doi:10.13801/j.cnki.fhclxb.20201210.005

甲基硅酸钠刻蚀聚多巴胺涂层构建超疏水木材及表征

doi: 10.13801/j.cnki.fhclxb.20201210.005

广西大学　资源环境与材料学院，南宁 530004

基金项目: 国家自然科学基金(31760188)；广西创新驱动发展专项(桂科 AA17204087-15)

详细信息

通讯作者:
秦志永，博士，讲师，硕士生导师，研究方向为木质材料表界面　E-mail：qinzhiyong@gxu.edu.cn

中图分类号: TB306
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出版历程
- 收稿日期: 2020-09-24
- 录用日期: 2020-12-04
- 网络出版日期: 2020-12-11
- 刊出日期: 2021-09-01

Fabrication and characterization of superhydrophobic wood by etching polydopamine coating with sodium methylsilicate

School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China

摘要

摘要: 利用聚多巴胺(PDA)涂层黏附和去质子化的特性，采用甲基硅酸钠(SMS)刻蚀PDA涂层，进一步采用十八烷基三甲氧基氯硅烷(OTS)对其进行低表面能处理制备了稳固型超疏水木材(Wood@PDA-SMS-OTS)。采用接触角(CA)测定仪、SEM、XPS分别对试样进行了表征。结果表明，水在Wood@PDA-SMS-OTS试样表面的静态CA最高为157.4°，滚动角(SA)为4.3°；SEM图像表明，SMS成功刻蚀了PDA涂层，同时水解生成疏水性的低聚或半聚的甲基硅氧烷覆盖在PDA涂层表面，形成了明显的微纳米粗糙结构；XPS分析表明，PDA在木材的表面形成均匀的涂层，SMS在刻蚀PDA涂层的同时，其水解生成的聚合物成功负载在PDA的表面，含长链结构的OTS接枝在木材的表面，使木材具有超疏水性能；超疏水木材表面经过24 h的水流冲刷、超声波震荡、酸碱腐蚀及有机溶剂等处理后，仍具有较强的超疏水稳固性。
- 超疏水木材 /
- 聚多巴胺 /
- 碱刻蚀 /
- 甲基硅酸钠 /
- 稳固性
Abstract: Superhydrophobic treatment of wood surface is of great significance for overcoming the hydrophilic problem of wood and expanding its application fields. In this paper, based on the adhesion and deprotonation characteristics of polydopamine (PDA) coating, sodium methylsilicate (SMS) was used to etch the PDA coating. Furthermore, octadecyltrichlorosilane (OTS) was used as a low surface free energy agent to prepare stable superhydrophobic wood (Wood@PDA-SMS-OTS). The samples were characterized by contact angle (CA) meter, SEM and XPS respectively. The results show that the maximum static CA of water on the surface of Wood@PDA-SMS-OTS samples is 157.4° and the sliding angle (SA) is 4.3°. SEM images show that SMS successfully etch the PDA coating and hydrolyze to generate hydrophobic oligomeric or semi-polymerized methylsiloxane on the surface of the PDA coating, forming an obvious micro-nano rough structure. XPS analysis shows that PDA forms a uniform coating on the surface of wood. While SMS etchs the PDA coating, its polymer formed by hydrolysis is successfully loaded on the surface of PDA. OTS containing long chain structure is grafted on the surface of wood, which makes the wood realize superhydrophobic. The surface of superhydrophobic wood still has stable superhydrophobicity after 24 h of water scouring, ultrasonic vibration, acid-base corrosion and organic solvent treatment.
- superhydrophobic wood /
- polydopamine /
- alkali etching /
- sodium methylsilicate /
- stability

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图 1 超疏水木材模拟下雨测试示意图

Figure 1. Schematic diagram of water resistance test for superhydrophobic wood

下载: 全尺寸图片幻灯片

图 2 不同刻蚀时间下Wood@聚多巴胺(PDA)-甲基硅酸钠(SMS)和Wood@PDA-SMS-十八烷基三甲氧基氯硅烷(OTS)的接触角(CA)与滚动角(SA)

Figure 2. Contact angle (CA) and sliding angle (SA) of Wood@polydopamine (PDA)-sodium methylsilicate (SMS) and Wood@PDA-SMS-octadecyltrichlorosilane (OTS) with different etching time

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图 3 SMS水解负载在木材表面及OTS接枝示意图

Figure 3. Diagram of SMS hydrolysis loading on wood surface and OTS grafting

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图 4 木材试样的SEM图像

Figure 4. SEM images of wood samples ((a) Wood (0.3 k); (b) Wood@PDA (0.3 k); (c) Wood@PDA-SMS (2 k, 10 k); (d) Wood@PDA-SMS-OTS (2 k, 10 k))

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图 5 木材试样的XPS扫描图像

Figure 5. XPS scanning images of wood specimens

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图 6 Wood@PDA-SMS-OTS在超疏水木材水流冲刷(a)与超声波震荡(b)下的CA

Figure 6. CA of superhydrophobic wood under water flow scouring (a) and ultrasonic vibration (b) of Wood@PDA-SMS-OTS

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图 7 木材表面PDA的质子化过程

Figure 7. Protonation process of PDA on wood surface

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图 8 超疏水木材在不同pH值溶液(a)和有机溶剂(b)中浸泡24 h后的CA

Figure 8. CA of superhydrophobic wood soaked in different pH solutions (a) and organic solvents (b) for 24 h

THF—Tetra hydro furan

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表 1 木材试样表面的C1sA、C1sB、C1sC含量与氮碳原子比(N/C)、氧碳原子比(O/C)

Table 1. Content of C1sA, C1sB and C1sC on the samples surface and the atomic ratios of carbon nitrogen (N/C) and atomic ratios of oxygen carbon (O/C)

Samples	C1sA/%	C1sB/%	C1sC/%	(N/C)/%	(O/C)/%
Wood	77.4	16.2	6.3	0.6	21.9
Wood@PDA	70.3	22.4	7.2	3.2	27.9
Wood@PDA-SMS	83.2	12.0	4.8	1.1	28.8
Wood@PDA-SMS-OTS	97.4	2.5	0.03	1.0	9.9

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