Miscibility and adhesive properties of EVA‐based hot‐melt adhesives. II. Peel strength

Abstract

A series of ethylene vinyl acetate copolymers (EVA) were blended with some tackifier resins that were made from wood extracts, and possible relations between their miscibility and properties as hot-melt adhesives (HMA) were investigated. From our previous report on miscibility of various EVA-based HMAs, we chose some blends that represent some of the typical miscibility types and investigated their peel strengths. When the blends were miscible at testing temperatures, the temperature at which the maximum value of peel strength was recorded tended to move toward higher temperature as tackifier content of blends increased. This result corresponds to the storage modulus of the blends whose curves tended to move toward higher temperature as tackifier content of blends increased when blend components were miscible as well as their maximum values of tan ␦, or glass transition temperatures. It was characteristic for peel strength that there existed second peaks on peel strengths curves at ϳ 100°C, which adhesive tensile strengths for the blends did not have. In terms of relationship between miscibility and HMA performances, we suggest that there are several factors other than miscibility that affect absolute values of peel strength more directly than miscibility; this idea has to be investigated further in the a future study.

Factors influencing thermal, mechanical, optical, and adhesive properties of segmented poly(imide siloxane) copolymers films

“…Bonding press of poly(siloxane imide) films on copper foil. 35 [Color figure can be viewed at wileyonlinelibrary.com] siloxane) hot melt adhesive film were studied. The introduction of siloxane chain increased the intermolecular chain length and free volume of the polymer.…”

“…Excellent adhesive properties, high impact resistance, low dielectric constants, and favorable overall thermal and mechanical properties have led to poly(imide-siloxane) (PIS) copolymers being noticeable and potential branch of novel polyimides and widely studied in the applications of high-performance adhesives and coatings, but their films adhesions to metal are rarely reported. [33][34][35] Excellent adhesive properties, good gas permeability, low dielectric constants, and favorable overall thermal and mechanical properties have led to poly(imide siloxane) (PIS) copolymers being an noticeable and potential branch of novel polyimides and widely studied in the applications of adhesives to metal. If the difference in solubility between polysiloxane and polyimide was larger, polysiloxane tended to segregate at the surface.…”

“…Over recent decades, hot melt adhesive (HMA) has attracted more and more attention both theoretical and experimental because of their environment advantage and their ability to enable high-speed manufacturing processes. [33][34][35] Excellent adhesive properties, good gas permeability, low dielectric constants, and favorable overall thermal and mechanical properties have led to poly(imide siloxane) (PIS) copolymers being an noticeable and potential branch of novel polyimides and widely studied in the applications of adhesives to metal. However, to the best of our knowledge, the detailed discussion of poly(imide siloxane) hot melt adhesive has not been reported.…”

Polybutylene terephthalate modified with dimer acid methyl ester derived from fatty acid methyl esters and its use as a hot‐melt adhesive

“…DSC analysis revealed that the flexible and bulky DAME monomer decreases the glass transition temperature (T g ) and hinders the formation of [36]. g Data taken from reference [37]. h Data taken from reference [38].…”

Improving interface adhesion of magnetic particle modified EVA hot melt adhesive through introduction of a thermodynamically compatible component

“…Effective ways of reinforcing the adhesion property and improving the uidity of HMAs include using additives such as tackiers and plasticizers, or blending the adhesives with different polymers. Takemoto 13,14 studied the effect of tackiers on the adhesion properties of EVA copolymers and found that when the blends were miscible at testing temperature, the temperature at which the maximum of peel strength was found tended to increase with increasing content of tackier. Park 15,16 studied the adhesion and viscoelastic properties of three EVA composite HMAs with different vinyl acetate contents (15-28 wt%) blended with three aromatic hydrocarbon resins of different soening points.…”