Influence of humidity on the scratch behavior of polystyrene–acrylonitrile random copolymers
Influence of humidity on the scratch behavior of polystyrene–acrylonitrile random copolymers
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DOI：
10.1007/s10853-011-5534-4
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发表时间：
2011-04
影响因子：
4.5
通讯作者：
R. Browning;R. Minkwitz;P. Charoensirisomboon;H. Sue
中科院分区：
文献类型：
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作者：
R. Browning;R. Minkwitz;P. Charoensirisomboon;H. Sue
研究了一组模型聚苯乙烯-丙烯腈（SAN）无规共聚物在潮湿环境中暴露10天后对划痕行为的影响。根据ASTM D 7027/ISO 19252进行线性递增载荷划痕试验。关键划痕变形机制如周期性微裂纹、犁削和划痕可见性的发生的临界载荷被用作评估耐划痕性的指标。还评价了刮擦摩擦系数。据发现，一般来说，耐刮擦性在潮湿暴露的最初几天期间降低，但随后在饱和时经历一定程度的恢复。有人提出，最初吸收的水分导致塑化，使表面变弱，直到饱和，其中水分子聚集在表面上，以赋予一定程度的润滑，从而提高耐刮擦性。将讨论吸湿对聚合物划痕行为的影响。
The effect of exposure to a humid environment on the scratch behavior of a set of model polystyrene–acrylonitrile (SAN) random copolymers was investigated over a period of 10 days. Linear increasing load scratch tests were performed according to ASTM D7027/ISO 19252. The critical loads for the onset of key scratch deformation mechanisms like periodic micro-cracking, plowing, and scratch visibility were used as metrics for evaluating scratch resistance. The scratching coefficient of friction was evaluated, as well. It was found that, in general, the scratch resistance decreases during the first few days of moisture exposure, but then experiences a degree of recovery upon saturation. It is proposed that the initially absorbed moisture causes plasticization, making the surface weaker until saturation where the water molecules gather together on the surface to impart a degree of lubrication and consequently improve the scratch resistance. Implications of moisture absorption on the scratch behavior of polymers will be discussed.