模板法注射成型纳米结构及其疏水特性

以不同形貌和深宽比的阳极氧化铝(AAO)模板为模芯,采用注射成型方法制备了纳米结构,分析了纳注射成型的模具温度、制件的疏水特性和模芯的使用寿命。首先,通过对比3种AAO模板的结构特征和深宽比,研究了不同模具温度下纳米结构的复制质量。然后,针对纳米阵列结构的疏水特性,分析几何结构特征与模具温度对制件静态接触角的影响,探索PC制件不同成型区域内的疏水性能。最后,对AAO模板的宏/微观质量和使用寿命进行了分析。研究结果表明:模具温度对纳米结构复制质量影响显著,且主要体现在纳米结构的成型高度上;纳注射成型制件不同区域内的疏水特性略有差异,最大静态接触角可达108.2°,比平板制件提高了31.5%;500余次的注射成型后,低深宽比的AAO模板整体质量良好,而高深宽比的模板缺陷明显,使用寿命有限。

Injection molding nanostructures by template method and their hydrophobic properties

A method to prepare nanostructures based on injection molding was proposed by taking Anodic Aluminum Oxide (AAO) templates as the mold inserts. Mold temperatures, hydrophobic properties and service life of the mold inserts were studied. Firstly, the replication quality of the nanostructures under different mold temperatures was studied by comparing the morphologies and aspect ratios of three different AAO templates. Then, according to the hydrophobic property of a nano-array structure, the influences of structural characteristics and mold temperatures on the static contact angle were analyzed to explore the hydrophobicity in different regions of PC products. Finally, the macro/micro quality and service life of AAO templates were analyzed after injection molding process. The results indicate that the mold temperatures significantly affect the replication quality of nanostructures, which focuses on the molding heights of nanostructures. There are slight hydrophobic differences at different regions of injection molded parts. Compared to the PC products without nanostructures, the maximum contact angle increases by 31.5%, reaching to 108.2°. After 500 molding cycles or more, the AAO templates with low aspect ratios show good quality, while the defects in high aspect ratio AAO templates are quite obvious.