Modification of Turkish Pumice Mineral and Its Use as Additive for Poly (Lactic Acid) Based Bio-Composite Materials

Year 2020, , 111 - 117, 17.03.2020

Ali Sinan Dike

https://doi.org/10.35414/akufemubid.618993

Cited By: 3

Abstract

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.

Keywords

Pumice, Poly (lactic acid), Bio-composites, Extrusion, Polymer composites

Türk Pomza Mineralinin Modifikasyonu ve Poli (Laktik Asit) Bazlı Biyo-Kompozit Malzemelerinde Eklenti Olarak Kullanımı

Abstract

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.

Keywords

pomza, Poli (laktik asit), Biyo-kompozitler, Ekstrüzyon, Polimer kompozitler

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