Adhesion and Surface Glass Transition of Amorphous Polymers

Adhesion and Surface Glass Transition of Amorphous Polymers... 

The process of adhesion at the contact zone of two thick films of amorphous high-molecular-weight polymers with glassy bulk has been investigated by means of a lap-shear joint method. The kinetics and temperature dependence of strength a at both symmetric and asynunetric polymer-polymer interfaces have been found to follow the repetition mechanism of chain diffusion and an Arrhenius-like behavior, respectively. A new method to measure the surface glass transition temperature of thick... 

Melt glues are amorphous and/or partially crystalline polymers above their glass transition temperatures or melt temperatures. Their viscosities should not be too high so that they can wet surfaces well, and not too low so that they do not flow away from where they are applied. Best results are obtained for viscosities of about 10-1 000 Pa s. Poly(ethylenes), poly(ethylene-co-vinyl acetate), poly(vinyl butyrals), versamides, polyamides, aromatic copolyesters, polyurethanes, bitumens, and asphalts, for example, are used as melt glues. The adhesive effect is produced by solidification of the melt glue. 

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