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首页> 外文期刊>Holzforschung >Functionalisation of poly(ethylene terephthalate) (PET) surfaces with two cationised xylans by means of two anchoring polymers
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Functionalisation of poly(ethylene terephthalate) (PET) surfaces with two cationised xylans by means of two anchoring polymers

机译：通过两个锚固聚合物，用两个阳离子化的木聚糖对聚对苯二甲酸乙二醇酯（PET）表面进行功能化

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The main aim of this investigation was to study the interaction of cationised xylans as antimicrobial substances with poly(ethylene terephthalate) (PET) model films, prepared by spin coating. A quartz crystal microbalance (QCM-D) with dissipation monitoring was applied as a nanogram sensitive balance to detect the amount of adsorbed cationised xylans. The xylan adsorption onto PET model films was studied as a function of pH and ionic strength. To improve the adsorption, positively charged polyethylenimid (PEI) and negatively charged polyvinylsulfonic acid (PVSA), as sodium salt, were applied as anchoring polymers. Surface free energies and hydrophilic/hydrophobic properties of surfaces were monitored by goniometry. Cationised xylans favourably deposited at pH 5, where beside electrostatic, physical interactions are possible, and adsorption may be driven by entropy gain. Higher ionic strengths of solutions also improved adsorption, due to the lower water solubilities of xylans. When intermediate layers of chosen anchoring polymers were applied on the PET surfaces, the binding of xylans as well as their coating durability were improved. Surface modifications presented in this work, provided important information regarding the adsorption/desorption phenomena between antimicrobial cationised xylans and synthetic PET surfaces. The latter is of great interest, when composing hydrophilic and antimicrobial PET surfaces for medical applications.
机译：这项研究的主要目的是研究通过旋涂制备的阳离子化木聚糖作为抗菌物质与聚对苯二甲酸乙二醇酯（PET）模型薄膜的相互作用。具有耗散监测功能的石英微天平（QCM-D）被用作纳克灵敏天平，以检测吸附的阳离子化木聚糖的量。研究了木聚糖在PET模型薄膜上的吸附随pH和离子强度的变化。为了改善吸附效果，将带正电荷的聚乙烯亚胺（PEI）和带负电荷的聚乙烯磺酸（PVSA）（作为钠盐）用作锚固聚合物。通过测角法监测表面的表面自由能和亲水/疏水性能。阳离子化的木聚糖有利地沉积在pH 5处，在pH 5处，除了静电以外，还可能发生物理相互作用，并且吸附可能由熵增加驱动。由于木聚糖的水溶性较低，溶液的较高离子强度也改善了吸附。当将选定的锚定聚合物的中间层应用到PET表面时，木聚糖的结合力和涂层耐久性得以改善。这项工作中提出的表面改性，提供了有关抗菌阳离子木聚糖与合成PET表面之间吸附/解吸现象的重要信息。当组成用于医疗应用的亲水性和抗菌性PET表面时，后者引起了极大的兴趣。

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