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

Yıl 2020, , 162 - 170, 20.03.2020

Ali Sinan Dike

https://doi.org/10.18185/erzifbed.638547

Cited By: 2

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.

---

 [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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