Structure and Macroscopic Tackiness of Ultrathin Pressure Sensitive Adhesive Films

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• 作者：Alexander Diethert ; Volker K枚rstgens ; David Magerl ; Katharina Ecker ; Jan Perlich ; Stephan V. Roth ; Peter M眉ller-Buschbaum
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：August 22, 2012
• 年：2012
• 卷：4
• 期：8
• 页码：3951-3958
• 全文大小：335K
• 年卷期：v.4,no.8(August 22, 2012)
• ISSN：1944-8252

文摘

Ultrathin layers of the statistical copolymer P(nBA-stat-MA) with a majority of n-butyl acrylate (nBA) and a minority of methyl acrylate (MA) are characterized with respect to the film morphology and the mechanical response in a probe tack test. The probed copolymer can be regarded as a model system of a pressure sensitive adhesive (PSA). The films are prepared by spin-coating which enables an easy thickness control via the polymer concentration of the solution. The film thickness is determined with x-ray reflectivity (XRR) and white light interferometry (WLI). Grazing incidence small angle x-ray scattering (GISAXS) provides detailed and statistically significant information about the film morphology. Two types of lateral structures are identified and no strong correlation of these structures with the PSA film thickness is observed. In contrast, prominent parameters of the probe tack test, such as the stress maximum and the tack energy, exhibit an exponential dependence on the film thickness.

Keywords:

pressure sensitive adhesive; GISAXS; thin film; tack; structure; statistical copolymer