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. 2022 Feb 24;14(5):909.
doi: 10.3390/polym14050909.

Influence of Acrylonitrile Content on the Adhesive Properties of Water-Based Acrylic Pressure-Sensitive Adhesives

Irene Márquez  1   2 , Núria Paredes  1 , Felipe Alarcia  2 , José Ignacio Velasco  2
Affiliations

Influence of Acrylonitrile Content on the Adhesive Properties of Water-Based Acrylic Pressure-Sensitive Adhesives

Irene Márquez et al. Polymers (Basel). .

Abstract

A series of pressure-sensitive adhesives (PSA) were prepared by emulsion polymerization in order to obtain a PSA that meet with the current label market requirements. For it, the effect of the incorporation of acrylonitrile (ACN) as hard monomer was investigated in a n-butyl acrylate (n-BA) and acrylic acid (AA) system. Great differences were found in the adhesive performance according to the ACN weight ratio. Its increased resulted in a considerable rise in the average sol molecular weight and in the glass transition temperature. This was reflected in a decrease of adhesion forces (peel resistance and tack) and an increase of the cohesion forces (shear resistance). Moreover, the incorporation of the minimum amount of ACN studied showed a great change in the elastic modulus determined by dynamic shear resistance with respect to the based formulation that did not contain ACN. Finally, the ice bucket test was carried out to check the adhesive performance in cold and wet environments.

Keywords: acrylic pressure-sensitive adhesives; acrylonitrile; emulsion polymerization.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Acrylonitrile monomer structure.
Figure 2
Figure 2
Mechanism proposed by transfer to polymer reactions: (a) Intermolecular chain transfer to polymer. (b) Intramolecular chain transfer to polymer (backbiting).
Figure 3
Figure 3
Influence of average sol molecular weight in the Tg values.
Figure 4
Figure 4
FTIR spectra of E0, N6 and N10 samples over a range of wavenumber of 4000−2000 cm−1.
Figure 5
Figure 5
FTIR spectra of E0, N6 and N10 samples over a range of wavenumber of 2000−500 cm−1.
Figure 6
Figure 6
Representative force-displacement curves obtained by dynamic shear test.
Figure 7
Figure 7
Effect of acrylonitrile content on the elastic modulus.
Figure 8
Figure 8
Effect of acrylonitrile content on the maximum shear stress.
Figure 9
Figure 9
Effect of acrylonitrile content on the deformation energy until failure of the adhesive.
Figure 10
Figure 10
Optical pictures of the different states of a label of a same bottle using the adhesive N6 in the ice bucket test: (a) label just after remove the bottle from the ice bucket, (b) dried label after 24 h to remove the bottle from the ice bucket and (c) structural failure upon peel off the label manually.
See this image and copyright information in PMC

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