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首页> 外文期刊>Polymer international >Morphology, nanomechanical and thermodynamic surface characteristics of nylon 6/feather keratin blend films: an atomic force microscopy investigation
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Morphology, nanomechanical and thermodynamic surface characteristics of nylon 6/feather keratin blend films: an atomic force microscopy investigation

机译：尼龙6 /羽毛角蛋白共混膜的形态，纳米力学和热力学表面特征：原子力显微镜研究

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摘要

The surface structure and nanomechanical properties of solution-cast nylon 6 (NY6)/feather keratin (FK) blend films were investigated using a combination of tapping-mode atomic force microscopy (AFM) phase imaging and nanoscale indentation. A tendency for a nanoscale phase separation between NY6 and FK in their various blends was judged based on the blend phase images. The surface topography and roughness analysis of the AFM height images revealed that FK-rich blends had coarser surfaces than NY6-rich ones, possibly due to the heterogeneous nature of the FKchemical structure. Amplitude-phase-distance measurements involving the assignment of the darker and brighter regions of the phase images to NY6-rich and FK-rich, respectively, or vice versa led to the recognition of a phase inversion in the blend containing 40 wt% FK. The occurrence of the phase inversion phenomenon was related to the significant difference between the molecular weights of the blend constituents. Analysis of nanoindentation data showed that blending FK and NY6 at various ratios resulted in mixtures with modified mechanical and adhesion features. On the one hand, the NY6 component was responsible for an enhanced elastic modulus and stiffness of the blends, and on the other hand, the FK component provided higher pull-off force and work of adhesion for the samples. A new approach is also proposed to directly determine the surface energy (γ) values of samples from the nanoindentation data. The excellent consistency between the calculated y values and the results obtained from contact angle measurements lends credence to the proposed approach.
机译：溶液浇铸的尼龙6（NY6）/羽毛角蛋白（FK）共混膜的表面结构和纳米机械性能使用攻丝模式原子力显微镜（AFM）相成像和纳米级压痕技术进行了研究。基于共混物相图像，可以判断NY6和FK在其各种共混物中存在纳米级相分离的趋势。 AFM高度图像的表面形貌和粗糙度分析表明，富含FK的混合物的表面比富含NY6的表面更粗糙，这可能是由于FK化学结构的异质性所致。幅相距离测量涉及将相位图像的较暗和较亮区域分别分配给富含NY6和富FK的相，反之亦然，这导致了对包含40 wt％FK的共混物中相变的认识。相转变现象的发生与共混物成分的分子量之间的显着差异有关。纳米压痕数据的分析表明，以不同比例混合FK和NY6会导致混合物具有改善的机械和粘合特性。一方面，NY6组分可提高共混物的弹性模量和刚度，另一方面，FK组分可为样品提供更高的拉拔力和附着力。还提出了一种新方法，可以从纳米压痕数据直接确定样品的表面能（γ）值。计算得出的y值与从接触角测量获得的结果之间的出色一致性为该方法提供了依据。

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