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首页> 外文期刊>RSC Advances >Viscoelastic and structural properties of poly(vinyl alcohol)/poly(vinylpyrrolidone) hydrogels
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Viscoelastic and structural properties of poly(vinyl alcohol)/poly(vinylpyrrolidone) hydrogels

机译：聚（乙烯醇）/聚（乙烯基吡咯烷酮）水凝胶的粘弹性和结构性能

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Physical hydrogels were obtained by freezing/thawing of aqueous solutions of 15% poly(vinyl alcohol) (PVA)/poly(vinylpyrrolidone) (PVP) mixtures with different ratios between the polymers. The rheological behavior was investigated after different numbers of freezing/thawing cycles at 37 °C. An aging effect, which depends on PVP content into the polymer mixture, was evidenced as an increase of the viscoelastic moduli in time. Swelling measurements demonstrated that the hydrogels containing up to 10% PVP show a higher stability in water. Scanning electron microscopy images of the hydrogels reveal a three-dimensional structure with the pores size depending on the ratio between the two polymers. X-ray powder diffraction evidenced that the addition of PVP determines a decrease of the crystallinity of PVA gels obtained by repeated freezing/thawing cycles. Small-angle X-ray scattering measurements indicated that the maximum diameter of the scattering objects reaches a minimum value for 10% PVP in the polymers mixture.
机译：通过在聚合物之间的不同比率的15％聚（乙烯醇）（PVA）/聚（乙烯基吡咯烷酮）（PVP）混合物的含水溶液的水溶液冷冻/解冻物理水凝胶。在37℃下在冻结/解冻循环的不同数量之后研究了流变行为。取决于PVP含量在聚合物混合物中的衰老效应被证明是随着粘弹性模量的增加。溶胀测量表明，含有高达10％PVP的水凝胶在水中显示出更高的稳定性。扫描电子显微镜图像的水凝胶揭示了具有孔径的三维结构，这取决于两种聚合物之间的比率。 X射线粉末衍射证明，PVP的添加决定了通过重复冷冻/解冻循环获得的PVA凝胶的结晶度的降低。小角X射线散射测量表明散射物体的最大直径在聚合物混合物中达到10％PVP的最小值。

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