Polipropilen/huntit kompozitlerinin mekanik, fiziksel ve morfolojik özellikleri

Abstract

Huntit hidromagnezit (HH) polimere eklenmeden önce, silan bağlayıcı kullanılarak polipropilen (PP) matris ile uyumlu hale getirilmiştir. Buna ek olarak, HH ile uyumlu olması amacıyla maleik anhidrit aşılanmış PP (Ma-g-PP) matrisi ile de kompozitler oluşturulmuştur. Kompozit malzemeler, sanayide en sık tercih edilen yöntem olan eriyik karıştırma metodu ile laboratuvar ölçekli çift vidalı ekstruder kullanılarak, % 10 HH içerecek şekilde hazırlanmıştır. Granül haline getirilen kompozitler enjeksiyonlu kalıplama yöntemi ile şekillendirilmiştir. Hazırlanan kompozitlere sırasıyla çekme testi, dinamik mekanik analiz (DMA) ve erime akış indisi testleri uygulanmıştır. Numunelerin mekanik dayanımlarına ek olarak, dış hava şartlarında kullanımını belirlemek amacıyla su emme testleri gerçekleştirilmiştir. Ayrıca toz parçacıkların polipropilen matris içinde dağılımını gözlemlemek amacıyla tarayıcı elektron mikroskobu (SEM) kullanılmıştır. Sonuçlar incelendiğinde, silanlanmış HH ve Ma-g-PP kullanımı ile elde edilen kompozitlerin mekanik özelliklerinde iyileşme gözlemlenmiştir. SEM görüntüleri incelendiğinde, silanlama işlemine tabi tutulmuş huntit ve Ma-g-PP kompozitlerinde huntit parçacıklarının PP matris içerisinde iyi dağılım gösterdigi ve parçacık ile polimer yüzeylerinin uyumlu olduğunu görülmektedir. Bu sonuç mekanik özelliklerdeki iyileşmeyi desteklemektedir. Kompozitlerin erime akış değerlerinde belirgin bir değişme olmamıştır. Bu sonuç, PP matrisine huntit dolgu maddesi eklenmesiyle polimerin işlenmesinde önemli bir sorunla karşılaşılmayacağını göstermektedir.

Keywords

• Polipropilen,Huntit,Yüzey Modifikasyonu,Kompozit Malzemeler

Mechanical, physical and morphological properties of polypropylene/huntite composites

Abstract

Huntite hydromagnesite (HH) is compatibilised with the polypropylene (PP) matrix by using silane coupling agents before addition to polymer.  In addition, composites with maleic anhydride grafted polypropylene (Ma-g-PP) matrix were prepared in order to compatible with HH. Composite materials which contain 10% HH content were prepared by using twin screw extruder which is the most common method in industry. Granulased composites were shaped with injection molding. Tensile test, dynamic mechanical analysis (DMA) and melt flow index tests were applied to composites, respectively. In addition to the mechanical properties of prepared composites, water absorption test of the composites were performed to consider their outdoor usage conditions.  Scanning electron microscopy (SEM) was used to observe the dispersion of huntite particles inside the polypropylene matrix. Mechanical properties of composites obtained by using silanized huntite and Ma-g-PP were improved. SEM images show that composites which contain silanized huntite and Ma-g-PP have good dispersion of particles inside the PP matrix and particle surfaces were compatible with polymer surface. This results also support the mechanical test results. Distinct changes did not observed for the melt flow index results of the composites.  This results indicate that addition of the huntite to the PP matrix causes no obvious problem to the processibility of the polymer.

Keywords

• Polypropylene,Huntite,Surface Modification,Composite Materials

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