氮化硼纳米片作为抗原子氧腐蚀填料的应用

对氮化硼纳米片(BNNS)作为填料提高聚合物的抗原子氧腐蚀性能进行了实验研究.利用液相剥离在聚乙烯醇(PVA)水溶液中制备了稳定分散的BNNS,采用基于离心技术的尺寸筛选方法,获得了具有3种不同横向尺寸的BNNS,其平均面积分别约为21.4,4.1,1.0μm2.采用浇注法,将PVA/BNNS分散液原位复合成复合薄膜.原子氧腐蚀实验表明:3种BNNS均能提高PVA的抗原子氧腐蚀性能,添加约1.0 wt%的BNNS(平均面积为21.4μm2)可使质量损失降低87%.BNNS对原子氧的成键和壁垒效应,是其提高抗原子氧腐蚀性能的主要原因.

Application of BN nanosheets as atom-oxygen corrosion resistant fillers

The application of boron nitride nanosheets (BNNS) as fillers to enhance the polymer's atom-oxygen corrosion resistance was investigated. Stable BNNS dispersions in polyvinylalcohol (PVA) solutions were prepared by liquid-phase exfoliation. By using a centrifugation-based size-select route, BNNS with three kinds of different lateral sizes were obtained. Their average area was about 21.4, 4.1, 1.0 μm², respectively. The PVA/BNNS composite films were prepared by casting the PVA/BNNS dispersions. Atom-oxygen corrosion experiments indicate that all these BNNSs can enhance the atom-oxygen corrosion resistance of PVA. An addition of 1.0wt% BNNS (21.4 μm²) can lead to a reduction of 87% in PVA's mass loss. It is suggested that the bonding and barrier effects between atom oxygen and BNNS are responsible for the enhanced atom-oxygen corrosion resistance.