Miscibility and adhesive properties of ethylene vinyl acetate copolymer (EVA)-based hot-melt adhesives. I. Adhesive tensile strength

Takemoto, Mototsugu; Kajiyama, Mikio; Mizumachi, Hiroshi; Takemura, Akimichi; Ono, Hirokuni

doi:10.1002/app.2266.abs

Cited by 17 publications

(21 citation statements)

References 3 publications

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“…The lack of effect of the molecular weight on the isomerization rate remained unclear, but the authors suggest that it may be related to the relatively high molecular weights employed in this study. In single‐lap shear experiments using glass substrates, maximum adhesive strength around 3.5 MPa was obtained, which is comparable to the adhesive strength of typical hot‐melt adhesives . The bond strength rapidly decreased to <0.2 MPa upon UV irradiation (λ = 365 nm, 50 mW cm −2 , 15 s), which demonstrates that the above polymers can be used as reversible on‐demand debondable adhesives.…”

Section: On‐demand Debonding Based On Reversible Bondssupporting

confidence: 54%

(De)bonding on Demand with Optically Switchable Adhesives

Hohl

Weder

2019

Advanced Optical Materials

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nature of polymer-based adhesives prevent their easy removal and stifle or complicate debonding, rebonding, (end-of-life) recycling, and repair. In this context, the development of debonding-on-demand (DoD) adhesive technologies is attracting rapidly growing interest. Indeed, DoD techniques have already entered commercial exploitation in applications such as easily removable wound dressings, [2,3] temporal fixation in semiconductor manufacturing, [4][5][6] and the repair, replacement, or recycling of components. [7][8][9] While many debonding technologies employ heat to reduce the adhesive strength by imparting physical property changes of the adhesive, [10][11][12][13][14] light-induced debonding technologies represent an emerging field and have been much less explored. Photoirradiation is an attractive alternative to thermal debonding as it allows an efficient, contactless, remote stimulation that can be temporally and spatially controlled. [15][16][17][18] Moreover, factors such as the irradiation wavelength, intensity, and time can easily be tuned and it is often possible to focus the energy entry to the adhesive and minimize or avoid exposure of (sensitive) substrates. Of course, the approach requires that at least one of the substrates to be bonded is sufficiently transparent.The design of a light-debondable adhesive system is strongly related to the adhesive type and the requirements imparted by the application(s) for which the adhesive is designed. For instance, pressure-sensitive adhesives (PSAs), such as used in adhesive tapes, need to efficiently adhere under ambient conditions with only a brief application of pressure, they should withstand the (comparably small) loads experienced while bonded, and they must also be easily removable, ideally without leaving any residues on the substrate. [19,20] PSAs are therefore normally based on lightly physically or chemically cross-linked rubbery polymers such as natural rubber, styrene butadiene block copolymers, and acrylics. These materials provide a balance between adhesive and cohesive performance, i.e., adequate stiffness and strength to resist deformation and cohesive failure, and appropriate elasticity in order to establish adequate contact with the substrate. [1] On the other hand, structural adhesives must be able to effectively transmit large loads across the bonded joint and the high strength and high rigidity required for this function are usually achieved by the formation of glassy networks. Examples of such materials include cross-linked epoxy resins, which may possess shear strengths of >35 MPa, cyanoacrylates (superglues), acrylics, and polyurethanes. [19] Adhesives that enable bonding and especially debonding on demand (DoD) have attracted rapidly growing interest in the last decade, as these capabilities greatly improve the functionality of adhesives, particularly in connection with temporal fixation, repair, and recycling. Indeed, DoD techniques have already entered commercial exploitation in applications such as easily removable wound dressin...

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Section: On‐demand Debonding Based On Reversible Bondssupporting

confidence: 54%

(De)bonding on Demand with Optically Switchable Adhesives

Hohl

Weder

2019

Advanced Optical Materials

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“…After a TPA bond has been formed, its bonding strength can be dramatically influenced by the temperature of the bond [47], [51], [52]. As the temperature increases from room temperature, bonding strength first exponentially decreases, and separation results from interfacial adhesive failure between TPAs and adherends.…”

Section: B Temperature Dependence Of Bonding Strengthmentioning

confidence: 99%

“…Moreover, it has been reported that bonding strength could still be maintained under the presence of alien material, e.g., water [49] or clay minerals [50], showing that HMAs are robust toward external disturbance. Upon cooling to room temperature, HMAs will be hardened and the bonding strength can be as high as 1-10 MPa [47], [51], [52].…”

Section: A Adhesion Through Thermal Bondingmentioning

confidence: 99%

Large-Payload Climbing in Complex Vertical Environments Using Thermoplastic Adhesive Bonds

2013

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Despite many approaches proposed in the past, robotic climbing in a complex vertical environment is still a big challenge. We present here an alternative climbing technology that is based on thermoplastic adhesive (TPA) bonds. The approach has a great advantage because of its large payload capacity and viability to a wide range of flat surfaces and complex vertical terrains. The large payload capacity comes from a physical process of thermal bonding, while the wide applicability benefits from rheological properties of TPAs at higher temperatures and intermolecular forces between TPAs and adherends when being cooled down. A particular type of TPA has been used in combination with two robotic platforms, featuring different foot designs, including heating/cooling methods and construction of footpads. Various experiments have been conducted to quantitatively assess different aspects of the approach. Results show that an exceptionally high ratio of 500% between dynamic payloads and body mass can be achieved for stable and repeatable vertical climbing on flat surfaces at a low speed. Assessments on four types of typical complex vertical terrains with a measure, i.e., terrain shape index ranging from −0.114 to 0.167, return a universal success rate of 80%-100%.

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“…The tackifier improves the mobility of the base polymer during the taping process by acting as a diluent and also improves the peel strength during the peeling process. Many researchers1–8 have investigated the mechanism of tack improvement through the addition of tackifiers.…”

Section: Introductionmentioning

confidence: 99%

Influence of diblock addition on tack in a polyacrylic triblock copolymer/tackifier system measured using a probe tack test

Yamamura

Fujii

Nakamura

et al. 2012

J of Applied Polymer Sci

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The influence of diblock copolymer addition on the tack properties of a polyacrylic triblock copolymer/tackifier system was investigated. For this purpose, poly(methyl methacrylate)‐block‐poly(n‐butyl acrylate)‐block‐poly(methyl methacrylate) triblock copolymer (MAM) and a 1/1 blend with a diblock copolymer consisting of the same components (MA) were used as base polymers, and a tackifier was added in amounts ranging from 10 to 30 wt %. The temperature dependence of tack was measured by a probe tack test. The tack of MAM/MA at room temperature was significantly higher than that of MAM, and the improvement of MAM/MA upon the addition of the tackifier was higher than that of MAM. The peeling process at the probe/adhesive interface during the probe tack test was observed using a high‐speed microscope. It was found that for MAM/MA, cavitation was caused in the entire adhesive layer, and peeling initiation was delayed by the absorption of strain energy due to deformation of the adhesive layer. In contrast, for MAM, peeling progressed linearly from the edge to the center of the probe. The greater flexibility of the soft block chain in the diblock copolymer resulted in improved interfacial adhesion. 1H pulse nuclear magnetic resonance analysis showed that the addition of the tackifier improved the cohesive strength of the adhesive. Adhesion strength is affected by two factors: the development of interfacial adhesion and cohesive strength. In the MAM/MA/tackifier system, the presence of MA and the tackifier improved the interfacial adhesion and cohesive strength, respectively. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Miscibility and adhesive properties of ethylene vinyl acetate copolymer (EVA)-based hot-melt adhesives. I. Adhesive tensile strength

Cited by 17 publications

References 3 publications

(De)bonding on Demand with Optically Switchable Adhesives

(De)bonding on Demand with Optically Switchable Adhesives

Large-Payload Climbing in Complex Vertical Environments Using Thermoplastic Adhesive Bonds

Influence of diblock addition on tack in a polyacrylic triblock copolymer/tackifier system measured using a probe tack test

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