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Plasticity control of poly(vinyl alcohol)–graphene oxide nanocomposites

机译：聚（乙烯醇）型氧化物纳米复合材料的可塑性控制

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Composite films containing poly(vinyl alcohol) filled with different amounts of graphene oxide (2 and 4 wt%) were prepared by the solution casting technique, and the mechanical properties of the resulting materials were modified with different amounts of glycerol as a plasticizer. Two series of pure poly(vinyl alcohol) and graphene oxide-loaded films with fixed amounts of water were used for modification with glycerol, since water can also serve as a plasticizer for poly(vinyl alcohol). The morphology and physical properties of the plasticized and non-plasticized composites were studied; tensile tests were performed to investigate and compare their mechanical properties. Glycerol addition does not affect the excellent compatibility of the filler with the polymer matrix and uniform distribution of graphene oxide in poly(vinyl alcohol). For poly(vinyl alcohol)/graphene oxide films an increase of the Young's modulus and yield stress was found with an increase of the filler content; the Young's modulus for poly(vinyl alcohol) filled with 4 wt% of graphene oxide is almost two times higher than that of the pure polymer. Simultaneously, a sharp decrease of the elongation at break from 80% for pure PVA to about 5% for the PVA/GO composite with 4 wt% of GO is observed, and the film's brittleness dramatically increases. It was shown that the addition of glycerol to the composite films leads both to the Young's modulus decrease and tensile energy at break increase; here the Young's modulus decreases by 18 times after addition of 20 wt% of glycerol to the poly(vinyl alcohol) film filled with 4 wt% of graphene oxide. Thus, the use of plasticizer results in a significant increase of the ductile properties of graphene oxide filled poly(vinyl alcohol) composite films, and the higher the water content in the composite film, the more drastic the increase of the ductile properties observed.
机译：通过溶液铸造技术制备含有不同量的石墨烯氧化物（2和4wt％）的聚（乙烯醇）的复合薄膜，并用不同量的甘油作为增塑剂改性所得材料的机械性能。用固定量水的两种纯聚（乙烯醇）和石墨烯氧化物薄膜用甘油改性，因为水也可以用作聚（乙烯醇）的增塑剂。研究了增塑和非塑化复合材料的形态和物理性质;进行拉伸试验以研究和比较其机械性能。甘油添加不会影响填料与聚合物基质的优异相容性，并在聚（乙烯醇）中的石墨烯氧化物均匀分布。对于聚（乙烯醇）/石墨烯氧化膜，在填充物含量的增加，发现杨氏模量和产率应力的增加;填充有4wt％的石墨烯氧化物的聚（乙烯醇）的杨氏模量几乎比纯聚合物高的两倍。同时，观察到PVA /去复合材料的纯PVA的80％的伸长率从80％的伸长率降低，具有4wt％的Go的PVA /去复合，并且薄膜的脆性显着增加。结果表明，将甘油加入复合薄膜的引线既均导致杨氏模量减小和断裂增长的拉伸能量;在这里，杨氏的模量在加入20wt％的聚（乙烯醇）膜中填充有4wt％的石墨烯氧化物后减少18次。因此，增塑剂的使用导致石墨烯氧化物填充聚（乙烯醇）复合膜的延性性质的显着增加，复合膜中的水含量越高，观察到的延性性能的增加越多。

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