Hydrogen-bond driven formation of microstructured pressure sensitive adhesives (PSAs) with enhanced shear resistance

Jiménez, Nerea; Ballard, Nicholas; Asúa, José M.

doi:10.1016/j.polymer.2021.124210

Cited by 16 publications

(9 citation statements)

References 50 publications

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“…This has been particularly successful in improving the shear strength of acrylic latexes by targeting a film structure that contains a percolating network of a hard, or crosslinked, phase. This has been achieved practically through the addition of diblock copolymers that anchor to the particle surface, 114,115 through promoting hydrogen bond interactions at the particle surface 116 or by generating a gradient in the crosslinking density throughout the particle. 117 For example, Deplace et al synthesized a latex in which diacetone acrylamide, a functional monomer containing a ketone moiety, was added in the later stages of the polymerization such that it was enriched at the surface.…”

Section: All-acrylic Structured Latexes and Filmsmentioning

confidence: 99%

Designing acrylic latexes for pressure‐sensitive adhesives: a review

Ballard

2023

Polymer International

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Pressure‐sensitive adhesives (PSAs) are essential components of a large number of commercial products. The immense range of substrates that are required to be bonded, coupled with the challenging adhesive properties that are required in many applications, requires the development of PSAs with controllable structure. In this review, the development of acrylic latexes for use in PSA applications is discussed, with a particular emphasis on how to adjust the synthetic process to control adhesive properties. Following a general introduction to PSAs, a brief overview of the fundamental rheological properties that control adhesive behavior is given. Subsequently, routes to improve PSA performance through controlling the polymerization process are described. Finally, more complex systems that involve structured latexes and multiphase hybrids are detailed. The review concludes with a summary of future challenges for the field. © 2023 Society of Industrial Chemistry.

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Section: All-acrylic Structured Latexes and Filmsmentioning

confidence: 99%

Designing acrylic latexes for pressure‐sensitive adhesives: a review

Ballard

2023

Polymer International

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“…The solid-like component resists flow under sheer stress and guarantees clean de-bonding from the surface of the adherend. The liquid-like counterpart dissipates energy during the de-bonding process. , The industry standard adhesive properties of PSAs such as peel and tack properties strongly depend on the bulk rheological properties. The peel and tack adhesion properties could be tailored by the designed PSAs architectures by particularly varying the cross-linking degree and the polar group content.…”

Section: Introductionmentioning

confidence: 99%

UV-Curable Polyurethane Acrylate Pressure-Sensitive Adhesives with High Optical Clarity for Full Lamination of TFT-LCD

Wang

Zhou

Chen

et al. 2023

ACS Appl. Polym. Mater.

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Optically clear pressure-sensitive adhesives (PSAs) face the challenges presented by a range of electronic and touch screen applications. Although many efforts have been made to manipulate the optical and adhesion properties of ultraviolet (UV)curable acrylate-based PSAs, further application and large-scale production are still limited owing to the intrinsically poor processability that stems from the large content of the high-vinylequivalent and low-viscosity acrylic monomers. Introducing a lowvinyl-equivalent and high-viscosity polyurethane acrylate (PUA) prepolymer into the formulation is a facile method to solve this issue without sacrificing the transparency. In this study, a series of PUA prepolymers are prepared to construct the model of PUA-co-2ethylhexyl acrylate (2EHA), denoted as poly(PUA-2EHA). The influence of PUA prepolymer architectures (average functionality and molecular features) on the optical and adhesion properties is elaborately discussed. The chemical cross-linking-induced enhancement of the haze values of PUA-based PSAs is investigated for the first time. Moreover, an improved and uniform bright image display without blemish, which is usually called the Mura defect-free image display in the industrial field, is obtained by using poly(PUA-2EHA) as the optically clear adhesive for full lamination of the thin-film transistor liquid crystal display (TFT-LCD) module. The laminated TFT-LCD module could be disassembled easily without leaving the residue on the screen. These results provide clear design guidelines to regulate the properties of PUA-based PSAs, which are especially valuable for the large-scale industrial production of UV-cured PSAs and facilitate the development of display technologies.

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“…Moreover, the addition of crosslinks can reduce the viscoelasticity of the polymer network, which compromises the adhesive properties of the PSA elastomer by reducing its ability to flow into substrate microfeatures. 13,14 Alternatively, filling the voids with percolating networks of water-soluble polymers can enable bridges between latex particles that do not fully coalesce and has yielded significant shear enhancement, [15][16][17] but at the cost of extensibility and peel strength due to spatial confinement of the elastomer phase. 18 Similarly, filling voids with inorganic particles has been shown to increase shear resistance at the cost of flow properties, 19,20 due to immobilization of polymer chains at the nanoparticle surface.…”

Section: Introductionmentioning

confidence: 99%

Mechanical reinforcement of waterborne latex pressure‐sensitive adhesives with polymer‐grafted nanoparticles

Desroches,

Gatenil,

Nagao

et al. 2023

Journal of Polymer Science

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Waterborne pressure sensitive adhesives (PSAs) consisting of polymer microparticle emulsions (i.e. latex) are more commonly used in commercial applications than solvent‐borne alternatives, as the use of water as a suspension medium provides better consumer safety and reduces environmental impact. However, the lower mechanical performance of waterborne PSAs prevents their use in applications requiring permanent adhesion or strong bonding between substrates. This reduction in mechanical strength is often attributed to void spaces that form during water evaporation and coalescence of the latex particles, and thus a potential strategy to improve PSA strength would be to add filler materials to occupy these voids. Fundamental studies investigating how interfacial interactions between the latex and fillers affect the collective strength of the films would enable better design of adhesive compositions to tailor PSA mechanical properties. Here we report the use of polymer brush‐grafted nanoparticles (PGNPs) as a means of mechanically reinforcing the PSAs, and determine how different aspects of the particle and polymer brush designs enable this improvement in adhesive performance. The PGNPs investigated here are intentionally designed to phase segregate into the aqueous phase of the initial latex suspension, which allows them to both fill free pore volume and also form multivalent supramolecular interactions with the latex particles to form polymer bridges that improve the interconnectivity of the final film. These studies provide insight into potential design strategies for tuning PSA properties with PGNPs, and enable up to 32% improvements to the cohesive strength of the PSAs without the typical deterioration of adhesive strength observed in PSAs using non‐brush‐coated particle fillers.

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Hydrogen-bond driven formation of microstructured pressure sensitive adhesives (PSAs) with enhanced shear resistance

Cited by 16 publications

References 50 publications

Designing acrylic latexes for pressure‐sensitive adhesives: a review

Designing acrylic latexes for pressure‐sensitive adhesives: a review

UV-Curable Polyurethane Acrylate Pressure-Sensitive Adhesives with High Optical Clarity for Full Lamination of TFT-LCD

Mechanical reinforcement of waterborne latex pressure‐sensitive adhesives with polymer‐grafted nanoparticles

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