Polymer adhesives are widely used in daily applications and in industry owing to their flexibility and overall non-toxicity, particularly in interfacial adhesion. The spreading of polymer adhesives on adherend is one of the essential considerations for the interfacial adhesion of polymer adhesives, which is strongly related to their wetting behaviors. While relationships between polymer microstructure and adhesion have been investigated in previous studies, it remains challenging to unveil the effect of polymer microstructure on wettability. To address this issue, here we utilize coarse-grained molecular dynamics (CGMD) simulations to systematically elucidate how the wettability of a polymer adhesive droplet on a surface depends on bending stiffness. The wetting dynamics and the contact angle are studied to show the evolution of morphology of droplets during the wetting process. The results indicate the wettability is weakened by the increase of bending stiffness of polymer chain. Detailed thermodynamic property analysis is further conducted, revealing that the adhesion between the polymer droplet and substrate deteriorates due to the decline of wettability. Interestingly, we observe such deterioration becomes more significant by both increasing the temperature and decreasing the bending stiffness. Our study sheds light on the dependence of chain bending stiffness and temperature on the wetting behavior of polymer adhesive droplets, and offers insights, which, upon experimental validation can then be used for the design of adhesives or hydrogels.

聚合物粘合剂由于其柔韧性和整体无毒，特别是在界面粘合方面，被广泛用于日常应用和工业中。聚合物粘合剂在被粘物上的铺展是聚合物粘合剂界面粘合的基本考虑因素之一，这与其润湿行为密切相关。虽然在先前的研究中已经研究了聚合物微观结构和粘附力之间的关系，但揭示聚合物微观结构对润湿性的影响仍然具有挑战性。为了解决这个问题，我们在这里利用粗粒分子动力学 (CGMD) 模拟来系统地阐明聚合物粘合剂液滴在表面上的润湿性如何取决于弯曲刚度。研究润湿动力学和接触角以显示润湿过程中液滴形态的演变。结果表明，聚合物链弯曲刚度的增加削弱了润湿性。进一步进行详细的热力学性能分析，揭示聚合物液滴与基材之间的附着力由于润湿性下降而恶化。有趣的是，我们观察到随着温度的升高和弯曲刚度的降低，这种恶化变得更加显着。我们的研究揭示了链弯曲刚度和温度对聚合物粘合剂液滴润湿行为的依赖性，并提供了见解，经过实验验证，这些见解可用于粘合剂或水凝胶的设计。结果表明，聚合物链弯曲刚度的增加削弱了润湿性。进一步进行详细的热力学性能分析，揭示聚合物液滴与基材之间的附着力由于润湿性下降而恶化。有趣的是，我们观察到随着温度的升高和弯曲刚度的降低，这种恶化变得更加显着。我们的研究揭示了链弯曲刚度和温度对聚合物粘合剂液滴润湿行为的依赖性，并提供了见解，经过实验验证，这些见解可用于粘合剂或水凝胶的设计。结果表明，聚合物链弯曲刚度的增加削弱了润湿性。进一步进行详细的热力学性能分析，揭示聚合物液滴与基材之间的附着力由于润湿性下降而恶化。有趣的是，我们观察到随着温度的升高和弯曲刚度的降低，这种恶化变得更加显着。我们的研究揭示了链弯曲刚度和温度对聚合物粘合剂液滴润湿行为的依赖性，并提供了见解，经过实验验证，这些见解可用于粘合剂或水凝胶的设计。揭示聚合物液滴与基材之间的附着力由于润湿性下降而恶化。有趣的是，我们观察到随着温度的升高和弯曲刚度的降低，这种恶化变得更加显着。我们的研究揭示了链弯曲刚度和温度对聚合物粘合剂液滴润湿行为的依赖性，并提供了见解，经过实验验证，这些见解可用于粘合剂或水凝胶的设计。揭示聚合物液滴与基材之间的附着力由于润湿性下降而恶化。有趣的是，我们观察到随着温度的升高和弯曲刚度的降低，这种恶化变得更加显着。我们的研究揭示了链弯曲刚度和温度对聚合物粘合剂液滴润湿行为的依赖性，并提供了见解，经过实验验证，这些见解可用于粘合剂或水凝胶的设计。