Pressure Sensitive Adhesives Based on Vector^RSIS Polymers I. Rheological Model and Adhesive Design Pathways

Micromechanisms of Tack of Soft Adhesives Based on Styrenic Block Copolymers

“…[22] The role of this resin is well documented and is to dilute the isoprene entanglement network, reducing thus the elastic modulus, and to increase the dissipative properties of the adhesive through an increase in tand. [21,23] As demonstrated by our DSC results showing two T g 's but also by Xray scattering experiments obtained on a similar system by others, [27] the compounded adhesive retains a phase separated structure with styrene hard domains in an isoprene + resin matrix.…”

“…The mechanical properties of such a material resemble that of a crosslinked rubber, with the added advantage of a sharp change in properties when the styrene block melts and then when the structure becomes disordered. [21,27] This type of triblock copolymer can then be considered as a so-called thermoplastic elastomer, i.e., a rubber which can be processed at high temperature with standard thermoplastic processing techniques. However, the elastic modulus of this copolymer in its pure form is too high to be used directly in adhesive applications.…”

The relationship between mechanical properties and ballistic penetration depth in a viscoelastic gel

“…Synthetic polymer gels that contain non-aqueous solvents provide a more environmentally stable alternative to waterbased hydrogels, like ballistic gelatin, while simultaneously offering the enhanced ability to systematically vary the mechanical response. The polymer network backbone of synthetic polymer gels can consist of a wide range of chemistries including polybutadiene (Lenhart et al, 2007), poly(propylene glycol) (Mrozek et al, 2012), polydimethylsiloxane (Lenhart and Cole, 2006), and various block copolymers (Chantawansri et al, 2011;Nakajima et al, 1992;Seitz et al, 2007;Tse and Jacob, 1996). These synthetic gels all offer enhanced environmental stability, including expanded operational temperature ranges and increased performance lifetimes, when compared to traditional ballistic gelatin.…”

Cohesive failure of thin layers of soft model adhesives under tension

“…A yield stress fluid has these properties due to its yield stress and is therefore a reasonable model system for certain types of pressure-sensitive adhesives such as those based on organized block copolymer microstructures. 14,15 It has the advantage that its rheological properties are relatively simple compared to those of commercial adhesives. We will, in addition, characterize them completely.…”