Adhesion between Semihard Polymer Materials Containing Cyclodextrin and Adamantane Based on Host鈥揋uest Interactions

详细信息    查看全文

• 作者：Takahiro Kakuta ; Yoshinori Takashima ; Takaaki Sano ; Takashi Nakamura ; Yuichiro Kobayashi ; Hiroyasu Yamaguchi ; Akira Harada
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：February 10, 2015
• 年：2015
• 卷：48
• 期：3
• 页码：732-738
• 全文大小：527K
• ISSN：1520-5835

文摘

The adhesion between hard materials without any glue is difficult but challenging topic because hard materials inhibit molecular mobility and have a large gap on the adhesive interface. Here we show that host鈥揼uest interactions realize a strong adhesive strength between semihard materials based on polyacrylamide xerogel by using a minimal amount of water. The adhesive strength between 尾CD xerogel(x) and Ad xerogel(y), where 尾CD and Ad denote 尾-cyclodextrin and adamantane, respectively, increases as the molar ratio (mol %) of host (x) or guest (y) molecules increases, which indicates that adhesion between 尾CD xerogel(x) and Ad xerogel(y) is due to complexation between the 尾CD and the Ad units. Adhesion between 尾CD xerogel(10) and Ad xerogel(5) displays a robust adhesive strength (5.1 MPa). Competitive experiments using small molecules confirmed the importance of host鈥揼uest interactions in adhesion. Optical microscopic observations of the adhesion interfaces reveal that both sides of 尾CD xerogel(x) and Ad xerogel(y) pull together, reflecting the specific adhesive nature between the two materials. Furthermore, a self-healable semihard material, 尾CD-Ad xerogel(0.3, 0.4) modified with both 0.3 mol % of 尾CD and 0.4 mol % of Ad, shows an 88% stress recovery ratio. These results indicate that 尾CD and Ad moieties function as glue on the molecular level in the solid state.