In this study, Turkish pumice (P) mineral was treated with silane in order to increase the compatibility for poly(lactic acid) (PLA) which is a fully biodegradable polymer widely used in packaging and outdoor applications. Neat and treated P powders were compounded with PLA at the concentrations of 5, 10, 15 and 20 wt% by melt mixing process. Surface characteristics of P samples were examined using infrared spectroscopy. Mechanical, water uptake, melt-flow and morphological properties of prepared composites were investigated by tensile and impact tests, water absorption test, melt flow rate test (MFR) and scanning electron microscopy (SEM) technique, respectively. Mechanical test results revealed that the highest increase in tensile strength and modulus values was obtained for 15 wt% of silanized P containing composite. Silane treated P additions to PLA caused increase in impact energy compared to untreated P sample. Impact energies of composites increased with concentration. Silanized P filled composite gave slightly higher MFR values with respect to pristine P. Water absorption of composites were found as higher than that of unfilled PLA. Composites containing silanized P exhibited lower water uptake values compared to untreated P samples because of the hydrophobic character of silicon containing surfaces. SEM micro-images of composites displayed that more homogeneous dispersion in PLA matrix was taken place for silane treated P particles than that of neat P stem from the increase of adhesion between P and PLA surfaces after silanization process.
In this study, Turkish pumice (P) mineral was treated with silane in order to increase the compatibility for poly(lactic acid) (PLA) which is a fully biodegradable polymer widely used in packaging and outdoor applications. Neat and treated P powders were composed with PLA at the concentrations of 5, 10, 15 and 20 wt% by melt mixing process. Surface characteristics of P samples were examined using infrared spectroscopy. Mechanical, water uptake, melt-flow and morphological properties of prepared composites were investigated by tensile and impact tests, water absorption test, melt flow rate test (MFR) and scanning electron microscopy (SEM) technique, respectively. Mechanical test results revealed that the highest increase in tensile strength and modular values was obtained for 15 wt% of silanized P containing composite. Silane treated P additions to PLA caused increase in impact energy compared to untreated P sample. Impact energies of composites increased with concentration. Silanized P filled composite gave slightly higher MFR values with respect to pristine P. Water absorption of composites were found as higher than that of unfilled PLA. Composites containing silanized P exhibited lower water uptake values compared to untreated P samples because of the hydrophobic character of silicon containing surfaces. SEM micro-images of composites displayed that more homogeneous dispersion in PLA matrix was taken place for silane treated P particles than that of neat P stem from the increase of adhesion between P and PLA surfaces after silanization process.
Bu çalışmada, Türk pomza (P) minerali, ambalaj ve dış ortam uygulamalarında sıkça kullanılan tamamen biyobozunur bir polimer olan poli (laktik asit) (PLA) ile uyumunu artırmak amacıyla silan ile muamele edilmiştir. Muamele edilen ve edilmeyen P tozları PLA ile eriyik karıştırma yöntemi ile 5, 10, 15 ve 20 ağırlıkça % konsantrasyonlarında eklenmiştir. P numunelerinin yüzey özellikleri infrared spektrofotometre kullanılarak incelenmiştir. Hazırlanan kompozitlerin mekanik, su alma, erime-akış ve morfolojik özellikleri sırasıyla çekme ve darbe testleri, su emme testi, erime akış hızı testi (MFR) ve taramalı elektron mikroskopi (SEM) teknikleri ile araştırılmıştır. Mekanik test sonuçlarına göre, çekme dayanım ve modülde en yüksek artışa %15 silanlanmış P içeren kompozitte rastlanmıştır. PLA içine silane ile muamele edilmiş P eklenmesi, edilmemiş P numunesi ile kıyasla darbe dayanımında artışa neden olmuştur. Kompozitlerin darbe dayanımları konsantrasyon ile artmıştır. Silanlanmış P eklenmiş kompozit P içerene göre bir miktar yüksek MFR değeri vermiştir. Kompozitlerin su emmeleri eklentisiz PLA’dan fazla olarak bulunmuştur. Silikon içeren yüzeylerin su sevmeyen özelliğinden dolayı silanlanmış P içeren kompozitler, modifiyesiz P ile kıyaslandığında daha düşük su emme değerleri sergilemiştir. Kompozitlerin SEM mikro-resimleri göstermektedir ki; silanlama işleminden sonar P ile PLA arasında yapışma arttığı için silan ile muamele edilmiş P parçacıklarında edilmeyenlere göre daha homojen dağılım gerçekleşmiştir.
Alan : Fen Bilimleri ve Matematik; Mühendislik
Dergi Türü : Ulusal
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