Influence of crosslinking and peeling rate on tack properties of polyacrylic pressure-sensitive adhesives
Influence of crosslinking and peeling rate on tack properties of polyacrylic pressure-sensitive adhesives
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DOI：
10.1080/01694243.2013.766564
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发表时间：
2013-07
影响因子：
2.3
通讯作者：
Y. Nakamura;Keigo Imamura;K. Yamamura;S. Fujii;Y. Urahama
中科院分区：
文献类型：
--
作者：
Y. Nakamura;Keigo Imamura;K. Yamamura;S. Fujii;Y. Urahama
研究了交联聚丙烯酸酯压敏胶的粘性和剥离性能。模型胶粘剂是一种交联的聚（丙烯酸正丁酯-丙烯酸）无规共聚物，丙烯酸含量为5摩尔%，具有各种交联度。使用探针粘性测试以1和10 mm/s的探针速率和各种接触时间测量粘性。粘性随接触时间增加。在10 mm/s范围内，随着交联度的增加，随接触时间增加的粘性降低，而在1 mm/s范围内，随着交联度的增加粘性降低。在30秒的接触时间下测量粘性的温度依赖性。随着交联度和探针速率的增加，粘性峰向更高的温度移动。使用高速显微镜观察剥离行为。随着剥离速率和交联度的降低，剥离行为由A向C转变。A：在10 mm/s的最大应力下，气穴和剥离同时进行，与交联度无关。B：在低应力下，空化发生在探针的边缘，并且在最大应力下以1 mm/s和高交联度扩展到探针的中心，然后剥离。C：在B之后，在低交联度下以1 mm/s发生原纤化。剥离行为的变化是由以下原因引起的：随着交联度和探针率的降低，界面粘附力增加，内聚强度降低。
Tack properties and peeling behavior of crosslinked polyacrylic pressure-sensitive adhesives were investigated. The model adhesive was a crosslinked poly(n-butyl acrylate-acrylic acid) random copolymer with an acrylic acid content of 5 mol% with various crosslinking degrees. Tack was measured using a probe tack test with probe rates of 1 and 10 mm/s and various contact time. The tack increased with contact time. The degree of tack rising with contact time decreased with an increase in crosslinking degree for 10 mm/s, while the tendency was opposite for 1 mm/s. The temperature dependency of tack was measured with a contact time of 30 s. The tack peak shifted to higher temperatures with an increase in crosslinking degree and probe rate. Peeling behavior was observed using high-speed microscopy. The peeling behavior changed from A to C with the decrease of peeling rate and crosslinking degree. A: Cavitation and peeling progressed simultaneously at maximum stress at 10 mm/s independent on the crosslinking degree. B: Cavitation occurred at the edge of the probe at low stress and spread to the center of the probe at maximum stress at 1 mm/s and high crosslinking degree, then peeled out. C: After B, fibrillation occurred at 1 mm/s with low crosslinking degree. The change of peeling behavior was caused by the following: the interfacial adhesion increased, while the cohesive strength decreased as crosslinking degree and probe rate decreased.