Dilution of components in blends poly (ethylene terephthalate) / poly (butylene terephthalate)

As we know, polymer blends in general are natural compounds that possess the mutual adhesion effect of the action of the secondary links without the involvement of covalent. Mutual compatibility of such mixtures can influence the final properties of these polymeric materials. It is known that a mixture of poly(ethylene terephthalate)/poly(butylenes terephthalate) are compatible in the amorphous phase, which clearly shows their only the glass transition temperature, whereas crystalline phase of these compounds crystallize separately with two different melting points. However, the compatibility of blends of polyethylene terephthalate/polybutylene terephthalate depends on their composition. The compatibility of these blends is different for amorphous and crystalline phases even qualitatively, and characterized by different parameters. By increasing the content of one of its component dispersed phase becomes highly interconnected, forming interpenetrating frame. This facilitates the interpenetration of two polymers, which develops during the phase separation. This effect is caused by the compatibility component in amorphous phase, as well as the effect of mutual dilution of the two crystallizing polymers. Therefore, the aim of the present work is to study the effect of mutual dilution of the mixture of component a polyethylene terephthalate/polybutylene terephthalate on the level of compatibility in the amorphous phase of these compounds. The influence of mutual dilution of blends poly(ethylene terephthalate)/poly(butylenes terephthalate) components on their miscibility has been studied. It has been shown that dilution absence gives the system near phase separation and dilution of about 15-20 wt. % one from components is necessary for full miscibility. The effect of mutual dilution of blend components results in essential reduction of its glass transition temperature.