Uyumlaştırıcı Kullanımı Ve Kimyasal Bileşimin Polipropilen/Termoplastik Poliüretan Karışımlarının Temas Açısı Ve Serbest Yüzey Enerjisi Özelliklerine Etkisi

Abstract

In this study, polypropylene/thermoplastic polyurethane (PP/TPU) blends of different weight ratios (75/25 and 25/75) were processed by melt blending using a maleic anhydride-grafted polypropylene (PP-g-MA) copolymer at different concentrations (0-3-5-7-9-11 phr) as coupling agent. The influences of the weight ratio of the polymers and amount of the coupling agent on the contact angle and surface free energy properties of the blends were investigated. Blends of PP and TPU are developed to reduce the cost of TPU, as well as to provide various combinations of thermal and mechanical properties. However, mixing of the two polymers is difficult due to the difference in polarity and interfacial tensions. Various compatibilizers are used in order to increase the mixing efficiency and also to improve the thermal and mechanical properties, one of them is PP-g-MA. With this study, it is aimed to understand the effects of blend composition and compatibilizer usage on the surface and contact angle properties of PP/TPU blends which have numerous uses such as blood and intravenous bags, especially in environments in contact with liquids. In addition, it has been aimed whether the mixing efficiency of polymer blends can be determined by contact angle measurements. It was found that the blend with 75% PP-25% TPU composition containing 9 phr PP-g-MA was found to be optimum in terms of an effective interfacial bond.