Abstract
Mechanical and thermal properties of a hot-melt adhesive made from the styrenic triblock copolymer of polystyrene-block-poly(ethylene-co-propylene)-block-polystyrene, tackifier, and plasticizer oil were examined in terms of the effect of addition of a homopolymer, poly(2,6-dimethyl-1,4-phenylene ether) (PPE). PPE is miscible with the styrene component of the triblock copolymer and has glass transition temperature, Tg, higher than that of the styrene component. The properties were examined by shear adhesion failure temperature test, 180° peel test, dynamic mechanical analysis, and temperature-modulated differential scanning calorimetry. It has been shown that the adhesive properties depend on Tg of the styrene domains, which linearly increases with the content of added PPE. The broader glass transition that resulted from the addition of PPE indicated inhomogeneous distribution of PPE in the styrene domains. Thermal resistance of the adhesive is sustained by physical crosslinks comprising the glassy styrene domains, which are finally broken above Tg of the PPE-rich part of the styrene domains.
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Kondo, H., Toda, A. Mechanical and Thermal Properties of a Hot-melt Adhesive of Tribrock Copolymer Added with a Miscible Homopolymer. Polym J 41, 74–82 (2009). https://doi.org/10.1295/polymj.PJ2008162
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DOI: https://doi.org/10.1295/polymj.PJ2008162