Kalsit Takviyeli Poli (Laktik Asit) Kompozit Malzemelerinin Hazırlanması ve Karakterizasyonu

Öz

Bu çalışmada, kalsit (KS) minerali ağırlıkça %5, 10, 15 ve 20 konsantrasyonlarında poli (laktik asit) (PLA) ile ekstrüzyon işlemi kullanılarak karıştırılmıştır. PLA ve kompozitlerin test numuneleri enjeksiyon kalıplama ile hazırlanmıştır. Kompozitlerin karakterizasyonları, çekme, sertlik ve darbe testlerini içeren mekanik testler, erime akış hızı testi (MFR) ile akış davranışı ve taramalı elektron mikroskopi (SEM) yöntemi ile morfolojik çalışmalar baz alınarak yapılmıştır. Mekanik test sonuçları, çekme dayanım ve modülde en yüksek artışa %10 KS eklenmiş kompozitte saptandığını göstermiştir. Daha fazla KS eklenmesi çekme dayanımında belirgin düşüşe neden olmuştur. PLA’nın darbe dayanımı KS eklenmesi ile azalmıştır. Kompozitler arasında en yüksek darbe enerjisi PLA-15 KS numunesinde bulunmuştur. Eklentisiz PLA’nın sertliği KS eklemelerinden sonra artmıştır. Eklentisiz PLA’ya kıyasla, KS takviyeli PLA biraz yüksek MFR değerleri vermiştir. Kompozitlerin SEM mikro-resimleri göstermiştir ki; KS parçacıkları düşük ekleme oranlarında PLA matrisi içinde homojen şekilde dağılmıştır. KS yüksek konsantrasyonlarda parçacık-parçacık etkileşimlerini tercih ettiğinden büyük aglomeratlar ve zayıf dağılım gözlenmiştir. Bu sonuçlara göre, %10 ve %15 konsantrasyonları kalsit içeren PLA kompozitleri için uygun olarak belirlenmiştir.

Anahtar Kelimeler

• kalsit,kompozit malzeme,poli (laktik asit),ekstrüzyon

Preparation and Characterization of Calcite Loaded Poly (Lactic Acid) Composite Materials

Öz

In this work, calcite (KS) mineral was compounded with poly (lactic acid) (PLA) at the concentrations of 5, 10, 15 and 20 wt% using extrusion process. Test samples of PLA and composites were prepared by injection molding. Characterization of composites were done based on mechanical tests including tensile, hardness and impact tests, flow behavior by melt flow rate test (MFR) and morphological studies by scanning electron microscopy (SEM) method.[A1]  Mechanical test results showed that the highest improvements in tensile strength and tensile modulus values were obtained for 10 wt% of KS filled composite. Further addition of KS caused remarkable decrease in tensile strength. Impact strength of PLA reduced by KS additions. The highest impact energy value was found in PLA-15 KS sample among composites. Hardness of neat PLA increased after KS inclusions. KS loaded PLA gave slightly higher MFR values compared to neat PLA. SEM micro-images of composites implied that KS particles dispersed homogeneously in PLA matrix at their lower loading ratio. Large agglomerates and poor dispersion were obtained for higher concentrations of KS since they favor particle-particle interactions. According to these results, concentrations of 10wt% and 15wt% were determined as suitable for calcite containing PLA composites.

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 [A1]Bu cümleyi yeniden yazabilir misiniz? Biraz karışık olmuş. Konuyu bilmeyen biri okuduğunda sertlik, çekme ve darbe testlerinin mekanik olduğunu bilmeyebilir. Bunu ayrı cümlelerde yazarsanız daha iyi olur.

Anahtar Kelimeler

• Poly (lactic acid),calcite,composite material,extrusion

Kaynakça

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