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首页> 外文期刊>Applied Surface Science >Preparation, Characterization And Surface Pk_a Values Of Poly(n-vinyl-2-pyrrolidone)/chitosan Blend Films
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Preparation, Characterization And Surface Pk_a Values Of Poly(n-vinyl-2-pyrrolidone)/chitosan Blend Films

机译：聚（n-乙烯基-2-吡咯烷酮）/壳聚糖共混膜的制备，表征及表面Pk_a值

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摘要

Blend films of poly(N-vinyl-2-pyrrolidone) (PVP) and chitosan (CTS) were prepared by casting method from acetic acid solutions. All blend films obtained are optically clear to the naked eye. The structure and physical properties of the blend films were analyzed by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), mechanical testing (Instron) and contact-angle measurements. The ATR-FTIR results indicated that there is no detectable band shifts at 1650 cm~(-1). From TGA studies, it was found that the onset degradation temperature of the blends almost unchanged due to the presence of a weak interaction between PVP and CTS chains. The DSC analysis showed a single glass transition temperature for all the blends, indicating that these polymers are miscible over the entire composition range. The mechanical properties of the blends, such as breaking stress and elongation at break and Young modulus were greatly affected with increase of CTS content. In addition, we found that the blends exhibit well defined contact angle titration curves from which the surface pK_a values were determined. In conclusion, these experimental findings provide fundamental knowledge for the preparation of bioreactive surfaces of controlled reactivity on CTS based blends.
机译：聚（N-乙烯基-2-吡咯烷酮）（PVP）和壳聚糖（CTS）的共混膜是通过流延法从乙酸溶液中制备的。所获得的所有混合膜在肉眼上都是光学透明的。共混膜的结构和物理性质通过衰减全反射傅里叶变换红外光谱（ATR-FTIR），热重分析（TGA），差示扫描量热法（DSC），机械测试（Instron）和接触角测量进行分析。 ATR-FTIR结果表明在1650 cm〜（-1）处没有可检测到的带移。从TGA研究中发现，由于PVP和CTS链之间存在弱相互作用，共混物的起始降解温度几乎不变。 DSC分析显示所有共混物具有单一的玻璃化转变温度，表明这些聚合物在整个组成范围内是可混溶的。 CTS含量的增加极大地影响了共混物的力学性能，例如断裂应力，断裂伸长率和杨氏模量。另外，我们发现共混物表现出明确定义的接触角滴定曲线，从中可以确定表面pK_a值。总之，这些实验结果为基于CTS的共混物制备可控反应性的生物反应性表面提供了基础知识。

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