Adhesion failure of antiscratch coatings on polycarbonate under UV irradiation
Adhesion failure of antiscratch coatings on polycarbonate under UV irradiation
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DOI：
10.1002/app.40507
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发表时间：
2014-08
影响因子：
3
通讯作者：
Xuan Zhang;Yanli Zhong;Lei Li;Yue Yan
中科院分区：
文献类型：
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作者：
Xuan Zhang;Yanli Zhong;Lei Li;Yue Yan
采用化学和物理方法研究了在紫外光照射下，未改性和等离子体改性的聚碳酸酯（PC）基体上抗划伤（AS）涂层与PC表面和界面的结合失效。通过接触角和傅里叶变换红外（FTIR）测量，PC表面（PC）和AS涂层紫外老化后的润湿性和表面元素组成的差异进行了评价。采用纳米压痕技术对紫外光照射下PC和AS涂层的纳米力学性能的变化进行了定量评估。等离子体改性PC涂层的附着力明显优于未改性PC基体。由于PC的光降解，AS涂层覆盖的PC的亲水性和极性显著增加，而硅涂层保持不变。纳米压痕测试显示，老化后涂层和暴露的PC的刚度明显增强。基于这些实验，我们提出，在紫外线照射下的粘附失败可能是由两个原因引起的：第一，光降解发生在PC覆盖的AS涂层;第二，应力引起的AS和PC的刚度变化在紫外线老化。© 2014 Wiley Periodicals，Inc. J.应用聚合物Sci. 2014，131，40507。
The adhesion failure of antiscratch (AS) coatings on unmodified and plasma-modified polycarbonate (PC) substrate was studied using both chemical and physical methods while considering the surface and interface changes between coatings and PC under ultraviolet (UV) irradiation. The differences in the wettability and surface elemental compositions of the PC surface (PCs) and AS coatings after UV ageing were evaluated by contact angle and Fourier transform infrared (FTIR) measurements. The nanoindentation technique was employed for the quantitative assessment of the changes in the nanomechanical properties of both PCs and AS coatings under UV irradiation. The adhesion of coating on plasma-modified PC was found to be significantly better than that of unmodified substrates. The hydrophilicity and polarity of PCs covered by AS coatings were significantly increased because of the photodegradation of PCs, whereas silicon coatings remained invariant. Nanoindentation tests revealed an obvious enhancement in stiffness of the coating and exposed PC after ageing. Based on these experiments, we proposed that adhesion failure under UV irradiation may be caused by two reasons: first, the photodegradation that occurred at the PCs covered by AS coatings; and second, the stress induced by the changes in stiffness of both AS and PCs under UV ageing. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40507.