MWCNT, GNP, H-BN, BNNT ile takviyelendirilmiş polifenilen sülfür (PPS) matrisli kompozitin özelliklerinin incelenmesi
Küçük Resim Yok
Tarih
2025
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bursa Teknik Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Teknolojik ilerlemeler ve ağır çalışma koşulları, günümüzde kullanılan malzemelerin performans sınırları zorlanmaktadır. Bu durum, avantajlı özelliklere sahip kompozit malzemelerin geniş bir uygulama alanı bulmasını sağlar. Kompozit malzemelerin özellikleri eklenen takviye malzemesine, oranına ve uygulama yöntemine göre değişir. Malzeme boyutlarını nano ölçeğe düşürmek, güçlü bir faz-arayüzey etkileşimi sağlayarak kompozit malzemelerin özelliklerini geliştirir. Polimer nanokompozitler, benzersiz yapıları sayesinde çeşitli üstün özellikler ve birçok potansiyel uygulama alanı sunar. Polifenilen sülfür (PPS), hafifliği, yüksek mukavemeti, yüksek sıcaklıklara dayanımı, kolay erişilebilirliği ve üstün mekanik ile fiziksel özellikleri sayesinde özellikle havacılık endüstrisinde büyük ilgi görmektedir. Bir nanokompozit yapıda PPS termoplastik polimerinin, mekanik ve fiziksel özelliklerini daha da geliştirmek için nano takviyeler ile güçlendirilebilir. Nano takviyelerin matris içinde homojen dağılımı, mekanik, fiziksel, termal ve elektriksel iletkenlik özelliklerini iyileştirmek için çok önemlidir. Bu amaçla PPS polimerinin, mekanik, fiziksel ve iletkenlik özelliklerini iyileştirmek için çok duvarlı karbon nanotüp (MWCNT), grafen nanoplatelet (GNP), hekzagonal bor nitrür (h-BN) ve bor nitrür nanotüp (BNNT) ile takviye edilmiştir. Kompozit malzemeler, PPS matris malzemesinin farklı ağırlık oranlarında nano takviye malzemeler ile hem sıcak pres hem de enjeksiyon kalıplama ile üretimleri denenmiştir. Üretilen kompozit malzemelere çekme, darbe, üç nokta eğme, sertlik, DSC, TGA, DMA, SEM analizleri, termal ve elektriksel iletkenlik ölçümleri yapılmıştır. Kompozit malzemelerde, mekanik karıştırma sonrasında sıcak presli üretimlerinde aglomerasyonun oluşmasından dolayı mekanik özelliklerde düşüş gözlenmiştir. Termal iletkenlik özellikleri incelendiğinde, %10 ağırlıkça GNP eklendiğinde %490, %10 ağırlıkça MWCNT eklendiğinde ise %45 artış söz konusudur. Yarı iletken saf PPS'nin orta frekansta %10 ağırlıkça MWCNT eklendiğinde yaklaşık %222 oranında elektrik iletkenliği artarak iletken hale geldiği görülmüştür. Enjeksiyon kalıplama ile üretilen kompozitlerde öncesinde eriyik karıştırma yapıldığı için nano takviyeler PPS matrisi içerisinde SEM analizleri sonucunda homojen dağıldı gözlenmiştir. Bu da dört nano takviye malzemesi için de mekanik özekliklerin iyileşmesini sağlamıştır. Ayrıca termal iletkenlik değerinin ağırlıkça %10 MWCNT takviyelendirildiğinde %1375 oranında ciddi bir artışa sebep olduğu gözlenmiştir. Karbon ve bor bazlı nano takviyeli PPS kompozitlerinin üretimi için en uygun yöntemin eriyik karıştırma sonrası enjeksiyon kalıplama olduğu belirlenmiştir.
Technological advancements and demanding working conditions challenge the performance limits of materials used today. This situation allows composite materials with advantageous properties to find wide application areas. The properties of composite materials depend on the type of additive material, its proportion, and the applied production method. Reducing the material dimensions to the nanoscale enhances the properties of composite materials by providing a strong phase-interface interaction. Polymer nanocomposites offer various superior properties and many potential application areas due to their unique structures.Polyphenylene sulfide (PPS) has garnered significant attention, especially in the aerospace industry, due to its lightweight, high strength, resistance to high temperatures, easy accessibility, and excellent mechanical and physical properties. In a nanocomposite structure, the mechanical and physical properties of the PPS thermoplastic polymer can be further enhanced by reinforcing it with nanofillers. The homogeneous dispersion of nanofillers within the matrix is crucial for improving mechanical, physical, thermal, and electrical conductivity properties. For this purpose, the PPS polymer was reinforced with multi-walled carbon nanotubes (MWCNT), graphene nanoplatelets (GNP), hexagonal boron nitride (h-BN), and boron nitride nanotubes (BNNT) to enhance its mechanical, physical, and conductivity properties. Composite materials were produced using both hot pressing and injection molding methods, incorporating the nanofillers into the PPS matrix material at different weight ratios.The produced composite materials were subjected to tensile, impact, three-point bending, hardness, DSC, TGA, DMA, SEM analyses, as well as thermal and electrical conductivity measurements. In composite materials, a decrease in mechanical properties was observed due to agglomeration occurring during hot pressing production following mechanical mixing. Regarding thermal conductivity, a 490% increase was achieved with the addition of 10 wt.% GNP, while a 45% increase was observed with 10 wt.% MWCNT. It was found that the electrical conductivity of the semiconducting pure PPS increased by approximately 222% with the addition of 10 wt.% MWCNT at mid-frequencies, rendering it conductive.In composites produced via injection molding, the nanofillers were observed to be homogeneously distributed within the PPS matrix as confirmed by SEM analyses, which was due to prior melt mixing. This homogeneity contributed to improved mechanical properties for all four types of nanofillers. Furthermore, the thermal conductivity significantly increased by 1375% when 10 wt.% MWCNT was added. It was determined that the most suitable production method for carbon- and boron-based nanofiller-reinforced PPS composites is injection molding following melt mixing.
Technological advancements and demanding working conditions challenge the performance limits of materials used today. This situation allows composite materials with advantageous properties to find wide application areas. The properties of composite materials depend on the type of additive material, its proportion, and the applied production method. Reducing the material dimensions to the nanoscale enhances the properties of composite materials by providing a strong phase-interface interaction. Polymer nanocomposites offer various superior properties and many potential application areas due to their unique structures.Polyphenylene sulfide (PPS) has garnered significant attention, especially in the aerospace industry, due to its lightweight, high strength, resistance to high temperatures, easy accessibility, and excellent mechanical and physical properties. In a nanocomposite structure, the mechanical and physical properties of the PPS thermoplastic polymer can be further enhanced by reinforcing it with nanofillers. The homogeneous dispersion of nanofillers within the matrix is crucial for improving mechanical, physical, thermal, and electrical conductivity properties. For this purpose, the PPS polymer was reinforced with multi-walled carbon nanotubes (MWCNT), graphene nanoplatelets (GNP), hexagonal boron nitride (h-BN), and boron nitride nanotubes (BNNT) to enhance its mechanical, physical, and conductivity properties. Composite materials were produced using both hot pressing and injection molding methods, incorporating the nanofillers into the PPS matrix material at different weight ratios.The produced composite materials were subjected to tensile, impact, three-point bending, hardness, DSC, TGA, DMA, SEM analyses, as well as thermal and electrical conductivity measurements. In composite materials, a decrease in mechanical properties was observed due to agglomeration occurring during hot pressing production following mechanical mixing. Regarding thermal conductivity, a 490% increase was achieved with the addition of 10 wt.% GNP, while a 45% increase was observed with 10 wt.% MWCNT. It was found that the electrical conductivity of the semiconducting pure PPS increased by approximately 222% with the addition of 10 wt.% MWCNT at mid-frequencies, rendering it conductive.In composites produced via injection molding, the nanofillers were observed to be homogeneously distributed within the PPS matrix as confirmed by SEM analyses, which was due to prior melt mixing. This homogeneity contributed to improved mechanical properties for all four types of nanofillers. Furthermore, the thermal conductivity significantly increased by 1375% when 10 wt.% MWCNT was added. It was determined that the most suitable production method for carbon- and boron-based nanofiller-reinforced PPS composites is injection molding following melt mixing.
Açıklama
Anahtar Kelimeler
Metalurji Mühendisliği, Metallurgical Engineering
