Polipropilen Kopolimerinde (PPB) Kalsiyum Karbonat Tane Boyutunun Kısa Süreli Çekme Sürünme Özellikleri Üzerine Etkisi

Year 2018, Volume: 7 Issue: 2, 206 - 213, 30.12.2018

Bülent Aydemir , Şenol Şahin , Tülin Şahin

https://doi.org/10.17100/nevbiltek.368459

Abstract

Polipropilen
blok kopolimer (PPB) kompozit malzemeler, polipropilen ve mikro tane boyutlu
mineral dolgulu malzemelerinden, yani kalsiyum karbonattan (CC) oluşur.
Testlerde kullanılacak numuneler, üç farklı tane boyutunda kalsiyum karbonat
(CC) mineralinin eklenmesiyle oluşturulmuştur. Farklı ticari CC minerallerinin
ortalama tane boyutları 1.65 um, 2.15 um, 5 um'dir. PPB kompozit malzemeler,
hacim oranının % 17.5'i (veya ağırlıkça % 38.89) içeriğinde sabit miktarda CC
ile hazırlandı. Bu çalışmada, hacimce %17,5 olan ve farklı boyutlarda CC
katkılı PPB kompozit malzemelerin kısa süreli çekme tip sürünme özellikleri
farklı gerilme seviyeleri için incelenmiştir. Gerilme seviyeleri, akma
dayanımının altındaki gerilmelerden seçilmiştir. Gerilme seviyeleri 8 MPa ve 16
MPa'dır. Sonuç olarak, katkısız PPB malzemeye göre CC katkılı PPB malzemelerde,
sürünme uzaması veya uzama düşüşü (∆ε) değerleri azaldığı tespit edilmiştir.
Ayrıca, tane büyüklüğü arttıkça depolanan enerji seviyelerinin azaldığı da
bulunmuştur.

Keywords

Sürünme, Polipropilen blok kopolimer (PPB), Tane boyutu, Kalsiyum karbonat (CC)

Effect of Particle Size of Calcium Carbonate on the Short-Term Tensile Creep Properties of Polypropylene Block Copolymer (PPB)

Abstract

Polypropylene block copolymer (PPB) composite
materials consist of polypropylene and micro particle mineral filled materials
that is calcium carbonate (CC). The samples to be used in the tests were formed
by adding calcium carbonate (CC) mineral in three different particle sizes. The
different commercial CC minerals average particle sizes are 1.65 μm, 2.15 μm, 5
μm. The PPB composite materials are prepared at constant quantities of CC with
content of 17.5 percentage of the volume ratio (or 38.89% in weight). In this
study, the short time tensile creep behavior of 17,5 vol. % different particle
sizes CC filled PPB materials were investigated for different stress levels.
Stress levels were selected from the stress below its yield strength. The
stress levels are at 8 MPa, 16 MPa. As a result, it was found that the creep
elongation or strain drop (∆ε) values decrease in the CC filled PPB materials
according to the unfilled PPB material. In addition, it has been found that the
absorbed energy levels reduce as the particle size increases.

Keywords

Creep, PPB, Particle size, Calcium carbonate

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