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Mechanical And Physical Characterization Of Bentonite And Barite Filled Low Density Polyethylene Composites

Oluşturulma Tarihi: 08-03-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): Kimya mühendisliği,

Yazar(lar): Elkawash, Hesham Mohammed S. (Yazar),

Emeği Geçen(ler): Tirkeş, Seha (Araştırma Sorumlusu),

Anahtar Kelimeler

Polyethylene, Bentonite, Barite, Surface Treatment, PolymerComposites, Extrusion.


Özet

In this thesis study, two kind of mineral fillers, bentonite (BNT) and barite (BRT),were incorporated into low density polyethylene (LDPE) by extrusion process. Silanetreatment was applied to BRT and BNT surfaces in order to increase theircompatibility with polymer matrix. Surface characteristics of fillers were examinedby fourier transformed infrared spectroscopy (FTIR) analysis. LDPE basedcomposites were prepared at one constant concentration of 10% for each fillers. Testsamples were prepared using injection molding. Mechanical, thermo-mechanical,melt-flow and morphological characterizations of unfilled LDPE and theircomposites were done by tensile and impact tests, dynamic mechanical analysis(DMA), melt flow index (MFI) test and scanning electron microscopy (SEM)technique, respectively.Test results showed that surface treatments increased the final properties ofcomposites because of better adhesion of BNT and BRT to LDPE matrix ascompared with untreated ones. Tensile and impact strengths, storage modulus andglass transition temperature of LDPE were improved by silane treated fillers. It wasconcluded from MFI test that both BRT and BNT additions resulted no remarkablechanges on melt flow rate of LDPE. According to SEM analysis of composites,silane treated BNT and BRT containing samples displayed homogeneous dispersionswhereas debondings were observed for untreated BNT and BRT filled compositesdue to their weak adhesion to polymer matrix.


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