The Research, Development,Demonstration, Testing, and Evaluation Program of the U.S. Department of Energy Office of Technology Development

Anderson, Thomas D.

doi:10.1007/978-94-011-2018-0_134

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“…Emulsion polymerization of low T g acrylics carried out to complete conversion produced significant amount of microgels inside the particles due to chain transfer to polymer via hydrogen abstraction of tertiary vinyl carbons 8. Discrete micro‐networks were formed after film formation, in contrast to continuous network formed in solution acrylic PSA9 when the film was crosslinked by either AlO 3 or TiO 4 .…”

Section: Introductionmentioning

confidence: 92%

Mechanistic studies in tackified acrylic emulsion pressure sensitive adhesives

Tobing

Klein

2000

J. Appl. Polym. Sci.

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Twenty-three wt % aqueous tackifier dispersion based on glycerol ester abietic acid (T g ϭ 64°C, M w ϭ 940) was added to emulsion polymer 50/32/15/3 poly(2-ethyl hexyl acrylate-co-vinyl acetate-co-dioctyl maleate-co-acrylic acid) pressure sensitive adhesive (PSA). From these latices, 25 m thick films were cast. The films were dried at 25°C for 24 h or at 121°C for 5 min. Dynamic mechanical analysis (DMA) of the films included measuring elastic modulus (GЈ) and damping factor (tan ␦). Under the above drying conditions, the films did not produce significant differences in their DMA and PSA properties as measured by loop tack, peel, and shear holding power. DMA of the tackified acrylic film showed thermodynamic miscibility between the tackifier and polymer regardless of the drying conditions. Microgels formed during emulsion polymerization of the acrylic PSA brought inherent weakness to the tackified film properties. In the neat acrylic PSA film, these discrete networks entangled with the uncrosslinked chains while in the tackified film, these networks could not form entanglements due to the increased molecular weight between entanglements for the uncrosslinked chains. This lack of network entanglements caused shear holding power of the tackified acrylic PSA film to be 4ϫ lower than that of the neat acrylic PSA film.

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Section: Introductionmentioning

confidence: 92%