A Comparison of Tackified, Miniemulsion Core−Shell Acrylic Latex Films with Corresponding Particle-Blend Films: Structure−Property Relationships

Abstract

Tackifying resins (TR) are often added to pressure-sensitive adhesive films to increase the peel strength and adhesion energy. In waterborne adhesives, the TR is dispersed in water using surfactants and then blended with colloidal polymers in water (i.e. latex). In such waterborne systems, there are problems with the colloidal stability and the ease of coating (coatability) of the particle blends, and the films are often hydrophilic and subject to water uptake. Here, an alternative method of making waterborne, tackified adhesives is demonstrated. The TR is incorporated within the core of colloidal polymer particles via miniemulsion polymerisation. Atomic force microscopy combined with force spectroscopy analysis reveals there is heterogeneity in the distribution of the TR in films made from particle blends and also in films made from miniemulsion polymers. Two populations, corresponding to TR-rich and acrylic-rich components, were identified through analysis of the AFM force-

Waterborne Polyurethane−Acrylic Hybrid Nanoparticles by Miniemulsion Polymerization: Applications in Pressure-Sensitive Adhesives

“…Force spectroscopy experiments on individual latex particles 39 and adhesive films 16,[40][41][42][43][44][45] to determine their nanomechanical properties have already been reported elsewhere. between the surface and the AFM tip was calculated by subtracting the deflection of the cantilever, z, from the height values that corresponded to the measured piezoelectric displacement, z piezo :…”

“…In the corresponding phase image (Figure 7d), the outer component is more dissipative of energy, making it appear darker than the component being encapsulated 16 . Combining information from the images, we conclude that a more viscous component (i.e.…”

Delivering Solvent Based Polymers in Eco‐Friendly Water Based Systems

“…However, other commercially relevant applications have been explored including the use of the miniemulsion processing technique for making improved water-based pressure sensitive adhesives (PSAs) [10][11][12][13]. This work focuses on generating unique combinations of adhesive properties by combining water insoluble components directly into the polymer matrix.…”

“…The use of miniemulsion polymerization for the enhancement of pressure sensitive adhesive (PSA) applications is relatively new [10][11][12][13]. The use of both tackifiers and rubbers incorporated into a more traditional acrylic composition used to make PSAs provides combinations of properties that cannot be achieved with either acrylics alone or acrylics with tackifier blends due in part to the large amount of surfactant required to generate a stable blend system.…”

How do soft nanoparticles affect temperature-induced nonlinearity of a UCST copolymer blend?

“…Even though the subject is quite important and has received a high priority concern for a long time [4], its basic physical aspects are still in infancy [5]. Room-temperature nonlinearity under finger-tight stresses facilitates polymer flows over various substrates leading to activated wetting [6,7]. Destruction of nanoparticles network exploring new states with minimum free energies under finite dynamic work-heat conditions represents fluctuating nonlinearity [1,8].…”