Adhesive and rheological properties of lightly crosslinked model acrylic networks
Adhesive and rheological properties of lightly crosslinked model acrylic networks
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DOI：
10.1080/00218460600646594
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发表时间：
2006-03-01
影响因子：
2.2
通讯作者：
Brummer, R
中科院分区：
文献类型：
--
作者：
Lindner, A;Lestriez, B;Brummer, R
本文研究了一系列轻度交联的丙烯酸类聚合物网络模型的粘弹性能和粘接性能。模型网络是在溶液中合成的丙烯酸2-乙基己酯和丙烯酸的统计共聚物或丙烯酸2-乙基己酯、丙烯酸和丙烯酸硬脂酯的三元共聚物。在聚合完成后，所有聚合物都轻微交联，以获得压敏粘合剂的典型性能。通过动态力学谱和单轴拉伸实验研究了该网络的体相流变性能。用装有圆柱形钢探针的仪器探针测试仪测试它们的粘合性能。在共聚物中丙烯酸的存在下，引起的弹性模量和抗界面裂纹扩展的临界能量释放速率G（c）和丙烯酸硬脂酯的掺入引起的模量和G（c）的下降，其特征在于增加。然而，在这两种情况下，G（c）的修改控制了整体行为。用Mooney-Rivlin模型对粘合剂的非线性弹性性能的分析提供了关于缠结和交联点之间的比率在控制脱粘时观察到的桥接原纤维的形成和延伸中所起的作用的新见解。
The viscoelastic and adhesive properties of a series of model, lightly crosslinked acrylic polymer networks have been investigated. The model networks were statistical copolymers of 2-ethyl-hexyl acrylate and acrylic acid or terpolymers of 2-ethyl-hexyl acrylate, acrylic acid, and stearyl acrylate synthesized in solution. All were lightly crosslinked after the polymerization was completed to obtain typical properties of pressure-sensitive adhesives. The bulk rheological properties of the networks were characterized by dynamical mechanical spectroscopy and in uniaxial extension. Their adhesive properties were tested with an instrumented probe tester fitted with a cylindrical steel probe. The presence of acrylic acid in the copolymer caused an increase in both elastic modulus and resistance to interfacial crack propagation characterized by the critical energy-release rate G(c) and the incorporation of stearyl acrylate caused a decrease in both modulus and G(c). In both cases, however, the modification of G(c) controlled the overall behavior. The analysis of the nonlinear elastic properties of the adhesives with the Mooney - Rivlin model provided new insights on the role played by the ratio between entanglements and crosslink points in controlling the formation and extension of the bridging fibrils observed upon debonding.