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首页> 外文会议>2002 Hot Melt Symposium Jun 23-26, 2002 Charlotte, North Carolina >CONTACT MECHANICS AND THE SCIENCE OF PRESSURE SENSITIVE ADHESION
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CONTACT MECHANICS AND THE SCIENCE OF PRESSURE SENSITIVE ADHESION

机译：接触力学与压敏胶粘力科学

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摘要

A goal of adhesion science is the ability to predict the performance of an adhesive bond from first principles. In the past, many attempts have been made to correlate interfacial parameters, mechanical properties and the strength of adhesive bonds. Recently, some success has been obtained with the advent of the contact mechanics approach to measuring adhesion. In particular, the work of Maugis[2] and also that of Shull, et. al.,[3] has provided significant insight. Acrylic pressure sensitive adhesives (PSAs) have been used to produce pressure sensitive adhesive tapes (PSATs) for nearly five decades. Despite the significant economic impact of these materials, there have been relatively few published studies on their surface chemistry and fundamental adhesion parameters. Part of the reason for the paucity of such information is the proprietary nature of the compositions used to make PSATs. In addition, conventional methods such as contact angle methods are not useful to study PSATs because of their viscoelastic character. Also, many pressure sensitive adhesive tape (PSAT) products depend upon release coatings for their ability to function in certain applications. A PSAT would not be able to function if it was not possible to unroll the tape from its backing. Indeed, certain pressure sensitive adhesive based labels must be removed from a release liner for them to function. Thus, it is important to understand the mechanism of adhesion and release of pressure sensitive tape from release coatings. Kinning has studied the release behavior of acrylic PSATs from release coatings based upon long alkyl side-chain poly-carbamates. We generate cylindrical samples of "pressure-sensitive adhesive-like networks" (PSA-LNs) using chemistry akin to acrylic PSAs. One of the materials (PSA-LN with no AA) was used as a foundation to which long alkyl side-chain polycarbamate release coatings were applied. The adhesion characteristics of these PSA-LNs with and without release coatings are examined using the contact mechanics methodology of Johnson, Kendall and Roberts[7] as well as that of Maugis. The surface energy was measured during loading and adhesion energy was measured as a function of the rate of crack propagation during unloading. In addition, PSATs were generated using very similar chemistry to that of the PSA-LNs. The peel properties of the PSATs to each other as well as to the release coatings were measured using standard methods. It was found that the peel properties could be correlated with the contact mechanical measurements. Hence, a connection was made between the low rate contact mechanics measurements and the standard measurement of peel strength.
机译：粘合科学的目标是能够根据第一原理预测粘合性能的能力。过去，已经进行了许多尝试来关联界面参数，机械性能和胶粘剂的强度。近来，接触力学方法用于测量粘附力已经获得了一些成功。特别是，Maugis [2]和Shull等人的工作。 [3]等人提供了重要的见解。丙烯酸压敏胶粘剂（PSA）已用于生产压敏胶粘带（PSAT）已有近五十年的历史了。尽管这些材料对经济产生了重大影响，但有关其表面化学和基本粘合参数的研究却相对较少。缺乏此类信息的部分原因是用于制造PSAT的组合物的专有性质。另外，常规方法如接触角方法由于其粘弹性特性而对研究PSAT毫无用处。同样，许多压敏胶带（PSAT）产品依赖于防粘涂层才能在某些应用中发挥作用。如果无法从磁带背面展开磁带，则PSAT将无法运行。实际上，必须将某些基于压敏粘合剂的标签从离型纸上移除，以使其起作用。因此，重要的是要理解压敏胶带从剥离涂层的粘附和剥离机理。 Kinning研究了丙烯酸PSATs从基于长烷基侧链聚氨基甲酸酯的防粘涂料中的释放行为。我们使用类似于丙烯酸类PSA的化学方法生成“压敏胶状网络”（PSA-LNs）的圆柱形样品。一种材料（不含AA的PSA-LN）被用作基础，上面涂有长烷基侧链聚氨基甲酸酯防粘涂料。使用Johnson，Kendall和Roberts [7]以及Maugis的接触力学方法，研究了具有和不具有防粘涂层的这些PSA-LNs的粘附特性。在加载过程中测量表面能，并在卸载过程中测量粘附能与裂纹扩展速率的关系。此外，使用与PSA-LN非常相似的化学方法生成PSAT。使用标准方法测量了PSAT之间以及剥离涂层之间的剥离性能。发现剥离性质可以与接触机械测量相关。因此，在低速接触力学测量和剥离强度的标准测量之间建立了联系。

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