A Facile Activation Method for Improving the Wettability of Polyurethane Surfaces

Abstract

This work reports the activation of polyurethane film surfaces in order to enrich them with polar groups such as -NH2, -OH, -COOH or radicals, which further allows immobilization of several bioactive compounds. UV-activation was used to introduce new groups on the polymer surface without affecting the bulk properties. The current arising species improve the wettability of the PU surfaces as it was observed from the static contact angle measurements. The structure and composition of the new PU surfaces were analyzed by using ATR-FTIR spectroscopy. The results suggested the possibility of modifying the PU surfaces in a shorter time periods, in order to provide many sites to attach other biomacromolecules by polar interaction or hydrogen bonding.

The Motor Impact of the Static Balance in the Up Plank Position on Three Different Balls in Physical Activities of Physical Education Students

“…Butadiene rubber is an elastic polymer resulting from the polymerization of butadiene, which is the most important monomer and which is characterized by the following properties: good insulator, low elasticity, good water resistance and a remarkable abrasion resistance [ 25 , 26 ]. Polyurethane (PU) balls, a composite material, versatile, stronger and more resistant than PVC, are the closest in terms of technical characteristics to natural leather, with the following properties: high wear resistance, water-repellent effect, softness at low temperatures, and good elasticity allowing for the maintenance of sphericity and good controllability of the ball [ 27 , 28 ]. Polyvinyl chloride (PVC) is a versatile polymer with varied applicability, being a very durable material, with high strength, resistance to climate change and good geometric stability [ 29 ].…”