Studies on Functional Pressure-sensitive Adhesives

本文研究了压敏胶粘带表面改性对其粘接性能的影响。选择PBA [聚（丙烯酸丁酯）]和PIB [聚（异丁烯）]粘合剂作为压敏粘合剂。采用氮气和氧气等离子体对胶粘剂进行表面改性。氮等离子体处理对PBA和PIB粘合剂的粘合行为都显示出很大的影响：氮等离子体处理导致PBA粘合剂/不锈钢接头的剥离力降低57倍，而PIB粘合剂/不锈钢接头的剥离力增加2.2倍。氮等离子体对PBA和PIB胶粘剂的改性反应有本质的区别。PBA体系发生交联反应，PIB体系发生降解反应，氧等离子体处理导致各种羰基等官能团的形成。羰基的形成仅限于表面的最顶层（50-300 nm）。剥离强度与表面羰基含量密切相关，说明等离子体对压敏胶进行表面改性可以广泛地改变压敏胶的粘接性能。1999年8月26日在新奥尔良举行的粘附力研讨会上介绍了结果的细节。另外，细节公开在Journal of Adhesion Science & Technology，第13卷，第573 -592页（1999）和Journal of Applied Polymer Science，第78卷，第1392 -1401页（2000）中。

The influence of the surface modification of pressure-sensitive adhesive tapes on their adhesion behavior has been investigated. PBA [poly (butyl acrylate)] and PIB [poly (isobutylene)] adhesives were chosen as pressure-sensitive adhesives. Nitrogen and oxygen plasmas were used for the surface modification of the adhesives. The nitrogen plasma treatment showed large effects on the adhesion behavior of both the PBA and the PIB adhesives : The nitrogen plasma treatment led to decrease in the peel force for the PBA adhesive/stainless steel joint by 57 times, and increase for the PIB adhesive/stainless steel joint by 2.2 times. There are essential differences in the modification reactions caused by the nitrogen plasma between the PBA and PIB adhesives. Cross-linking reactions occurred in the PBA system, and on the other hand, degradation reactions occurred in the PIB system.The oxygen plasma treatment led to the formation of functional groups such as various carbonyl groups. The carbonyl formation was restricted to the topmost layer (50-300 nm) form the surface. The peel strength was closely related to the amount of carbonyl groups on the surface.From these results, we can conclude that surface modification of pressure-sensitive adhesive by plasmas can widely alter the adhesion behaviors. The details of the results were presented in the Symposium on Adhesion, which was held in New Orleans, on Aug.26, 1999. Also the details were published in Journal of Adhesion Science ＆ Technology, vol.13, p.573-592 (1999) and Journal of Applied Polymer Science, vol.78, p.1392-1401 (2000).