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首页> 外文期刊>RSC Advances >Design and development of a poly(acrylonitrile-co-methyl methacrylate) copolymer to improve the viscoelastic and surface properties critical to scratch resistance
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Design and development of a poly(acrylonitrile-co-methyl methacrylate) copolymer to improve the viscoelastic and surface properties critical to scratch resistance

机译：聚（丙烯腈 - 共聚甲基丙烯酸甲酯）共聚物的设计和开发，以改善抗划伤性抗抗耐粘性和表面性能

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Scratch resistance has become a coveted property for exterior applications as scratches not only reduce the life cycle and durability of a product but also affect its aesthetics. Poly(methyl methacrylate) [PMMA] based materials are often used for exterior applications despite their limited scratch resistance. This work focuses on the design, development and evaluation of methyl methacrylate (MMA) and acrylonitrile (AN) copolymers to improve the viscoelastic and surface properties critical to scratch resistance. In this work, a molecular modelling approach based on a quantitative structure–property relationship (QSPR) was employed to predict the desired properties such as elastic (E)-modulus and shear yield stress at different copolymer compositions. Thus, a series of poly(acrylonitrile- co -methyl methacrylate) [p(AN- co -MMA)] molecules with increasing AN content (～35, 75 and 82% in copolymer) were prepared by solution polymerization and evaluated using a nano-indentation test to investigate the surface hardness and E-modulus on compression moulded films. Tests revealed a significant increase in the modulus and surface hardness for the copolymers compared with the homopolymer (E-modulus: 5.8 GPa and 4.5 GPa; surface hardness 0.32 GPa and 0.22 GPa respectively). The values increased with increasing AN content of the copolymers. Stress relaxation studies were also performed to validate the predictions of improved shear yield stress obtained from the molecular modelling approach. It is suggested that the incorporation of AN imparts structural rigidity to the copolymers and thereby improves the scratch resistance of the p(AN- co -MMA) copolymers. Thus, p(AN- co -MMA) are good candidates for applications requiring improved scratch resistance.
机译：耐刮擦性已成为外部应用的令人垂涎的性能，因为划痕不仅可以降低产品的生命周期和耐用性，而且影响其美学。尽管其耐刮擦性有限，但聚（甲基丙烯酸甲酯）[PMMA]的材料通常用于外部应用。这项工作侧重于甲基丙烯酸甲酯（MMA）和丙烯腈（AN）共聚物的设计，开发和评价，以改善对耐刮擦性至关重要的粘弹性和表面性能。在这项工作中，采用基于定量结构性质关系（QSPR）的分子建模方法来预测不同共聚物组合物的所需性质，例如弹性（e） - 模倍和剪切屈服应力。因此，通过溶液聚合制备溶液聚合并使用纳米评估，通过溶液聚合制备一系列聚（丙烯腈 - 共聚物甲基丙烯酸甲酯）[P（An-Co-Co-Co-甲基甲基丙烯酸甲酯）[P（An-Co-MMA）]分子，并使用纳米评估 - 升压试验，研究压缩模塑膜上的表面硬度和E模量。试验显示与均聚物（E-模量：5.8GPa和4.5GPa分别为0.32GPa和0.22GPa）相比，共聚物模量和表面硬度显着增加。随着共聚物的含量增加，值增加。还进行了应力松弛研究以验证从分子建模方法获得的改进的剪切屈服应力的预测。建议掺入赋予共聚物的结构刚性，从而提高了P（An-Co-CaMMA）共聚物的耐刮擦性。因此，P（AN-Co-MMA）是需要改善耐刮擦性的应用的良好候选者。

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