Interplay between bulk viscoelasticity and surface energy in autohesive tack of rubber‐tackifier blends

Abstract

The effects of change in surface energy and bulk viscoelastic properties on the autohesive tack strength of brominated isobutylene‐co‐p‐methylstyrene (BIMS) rubber have been investigated by the addition of hydrocarbon resin (HCR) tackifier and maleated hydrocarbon resin (MA‐g‐HCR) tackifier. The addition of compatible HCR tackifier results in a reasonable increment in the tack strength of BIMS rubber by modifying only the bulk viscoelastic properties (compliance, entanglement molecular weight, relaxation time, self‐diffusion, and monomer friction coefficient values) of BIMS rubber to perform better during the course of bonding and debonding steps of the peel test. Incorporation of MA‐g‐HCR tackifier (containing 5–20 wt % of grafted maleic anhydride) steadily increases the tack strength of BIMS rubber further by precisely modifying both the surface energy and bulk viscoelastic properties to perform much better in the bonding and debonding steps. However, beyond 20 wt % of grafted maleic anhydride in the HCR tackifier, the tack strength starts decreasing due to the incompatibility between the blend components, and hence, the bulk viscoelastic properties required for bond formation are severely retarded by the interrelated reinforcing effect and the phase separation effect of the brittle MA‐g‐HCR tackifier in the BIMS rubber. Hence, the polar groups in a tackifier will contribute to significant enhancement of autohesive tack strength only if the bulk viscoelastic property of the rubber‐tackifier blend is favorable for bond formation and bond separation. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 972–982, 2010

Unique Compatibilized Thermoplastic Elastomer with High Strength and Remarkable Ductility: Effect of Multiple Point Interactions within a Rubber-Plastic Blend

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“…The dispersion (γ S D ) and polar (γ S P ) components of 100 i‑PP , 100 ECR , and the E-AE-MA-TP compatibilizer have been calculated using the contact angles of different probe liquids on the sample surfaces in accordance with the following theory. The Young equation for the contact angle θ can be written as , where γ S represents the surface free energy of the solid, γ L represents the surface free energy of the liquid, and γ SL represents the surface free energy of the solid–liquid interface.…”

Influence of hybrid nanostructures and its tailoring mechanism on permeability, rheology, conductivity, and adhesion properties of a novel rubber blend nanocomposite

“…35 The entanglement molecular weight can be related to the rubber plateau modulus using the following equation: 35 The entanglement molecular weight can be related to the rubber plateau modulus using the following equation:…”

“…The effect of the nanoclay in the plateau region is analyzed by determining the entanglement molecular weight (M e ). 35 The entanglement molecular weight can be related to the rubber plateau modulus using the following equation:…”

Investigation on the mechanical behavior of poly(2‐hydroxyethyl methacrylate) hydrogel membrane under compression in the assembly process of microfluidic system

“…Precise control of artificial microenvironments of hosting biological matter and mimicking the physical‐chemical properties of the in vivo tissue structure is achievable through suitable cell culture biocompatible substrates integration as commonly is described . The diverse packaging techniques for manufacturing and realization of cells‐based microfluidic system can be generally summarized in three categories: (i) thermal fusion bonding (e.g., through induction heating, thermo‐compression and laser welding), (ii) tackiness bonding, and (iii) surface pretreated assisted bonding for instance, based upon PDMS self‐adhesive property . Acceptable reliability has been proved when applying these packaging techniques in the microfluidic system manufacturing process.…”