期刊
ACS APPLIED MATERIALS & INTERFACES
卷 1, 期 9, 页码 2021-2029出版社
AMER CHEMICAL SOC
DOI: 10.1021/am9003792
关键词
adhesion; core-shell particles; cross-linking; nonlinear properties
资金
- European Commission Sixth Framework Program [NMP3-CT-2004-505442]
The effect of low levels of cross-linking on the adhesive and mechanical properties of waterborne pressure-sensitive adhesives was investigated, We have taken advantage of a core-shell latex particle morphology obtained by emulsion polymerization to create a heterogeneous structure of cross-links without major modification of the monomer composition. The latex particles comprise a shell containing cross-linkable diacetone acrylamido (DAAM) repeat units localized on the periphery-of a slightly softer core copolymer OF very similar composition. Adipic acid dihydrazide was added to the latex prior to film formation to react, with DAAM repeat units and affect interfacial cross-linking between particles in the adhesive films. The honeycomb-like structure obtained after drying of the latex results in a good balance between the dissipative properties required for adhesion and the resistance to creep. The characterization of the mechanical properties of the films shows that the chosen cross-linking method creates a percolating lightly cross-linked network, swollen with a nearly un-cross-linked component. With this cross-linking method, the linear viscoelastic properties of the soft films are nearly unaffected by the cross-linking while the nonlinear tensile properties are greatly modified. As a result, the long-term shear resistance of the adhesive film improves very significantly while the peel force remains nearly the same. A simple rheological model is used to interpret qualitatively the changes in the material parameters induced by cross-linking.
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