SURFACE FREE ENERGY AND FLEXURAL PROPERTIES OF WOLLASTONITE FILLED POLYPROPYLENE COMPOSITES

Öz

Nowadays, appearance is an important factor in vehicles. For this reason, paint application is widely used in plastic parts. Surface energy is a key parameter for the adhesion of paint on the surface of polymers. Among thermoplastic polymers, polycarbonate and acrylonitrile butadiene styrene are commonly used materials due to their higher surface energies. For low surface energy materials, surface energies can be increased using streamer, plasma, corona, mechanical etching and chemical etching methods. The aim of this work is to eliminate the pre-treatments applied to parts produced with polypropylene (PP) polymer using wollastonite (CaSiO3) additive. For this purpose, CaSiO3 filled PP composites containing 40 wt.% wollastonite with different sizes and coatings were produced by extrusion process. Afterwards, plate samples were prepared from granules using a hot pressing device. Flexural properties and surface free energy measurements were performed on these composites produced in plate form. From the results, an increased surface free energy was observed for small particle size and aminosilane coated wollastonite added PP composite with an increase by 23% of the total surface free energy. Flexural strengths were well correlated with the surface free energy results and showed an increase by 1.2% for the same additive.

Anahtar Kelimeler

• Polymer Composites
• Surface Free Energy
• Contact Angle
• Wollastonite
• Flexural Properties

VOLLASTONİT KATKILI POLİPROPİLEN KOMPOZİTLERİN YÜZEY SERBEST ENERJİSİ VE EĞİLME ÖZELLİKLERİ

Öz

Günümüzde, araçlarda görsellik önemli bir faktördür. Bu nedenle, plastik parçalarda boya uygulaması yaygın olarak kullanılmaktadır. Boyanın polimer yüzeyine yapışması için yüzey enerjisi önemli bir etkendir. Termoplastik polimerler arasında, yüzey enerjileri daha yüksek olduğundan dolayı genellikle polikarbonat ve akrilonitril bütadien stiren polimerleri yaygın olarak kullanılmaktadırlar. Düşük yüzey enerjili malzemelerde ise flamaj, plazma, korona, mekanik dağlama ve kimyasal dağlama yöntemleri kullanılarak yüzey enerjileri arttırılmaktadır. Bu çalışmanın amacı vollastonit (CaSiO3) katkı malzemesi kullanılarak, polipropilen (PP) polimeri ile üretilen parçalara uygulanan ön işlemlerin ortadan kaldırılmasını sağlayabilmektir. Bu amaçla, ağırlıkça %40 katkı içeren ve farklı boyut ve kaplamalardan oluşan CaSiO3 katkılı PP kompozitler ekstrüzyon yöntemi ile üretilmiştir. Daha sonra, sıcak presleme cihazı kullanılarak granüllerden plakalar elde edilmiştir. Plaka halinde üretilen kompozitlerin eğilme özellikleri ve yüzey serbest enerjisi ölçümleri yapılmıştır. Sonuçlara bakıldığında, küçük partikül boyutlu ve aminosilan kaplı vollastonit katkılı PP kompozitin toplam yüzey serbest enerjisinin %23 değerinde bir artışıyla, yüzey enerjisini arttırıcı bir özelliği olduğu görülmüştür. Eğilme mukavemetleri yüzey serbest enerjisi sonuçlarıyla örtüşmektedir ve aynı katkı için %1.2 oranında bir artış elde edilmiştir.

Anahtar Kelimeler

• Polimer Kompozitler
• Yüzey Serbest Enerjisi
• Temas Açısı
• Vollastonit
• Eğilme Özellikleri

Kaynakça

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