Thermal Transition and Mechanical Properties of Magnetite and Wollastonite Filled Rigid Polyurethane Foams

Year 2020, Ejosat Special Issue 2020 (ISMSIT), 138 - 145, 30.11.2020

Doğan Berkay Altınel , Meral Akkoyun

https://doi.org/10.31590/ejosat.819855

Abstract

Polyurethane (PU) foams, despite their low mechanical and thermal conductivity properties, are preferred materials in applications such as automotive, insulation and adhesives because of their ease of processing and their possibility to be produced as rigid/flexible materials. Rigid polyurethane foams are materials used in the automotive, ship and construction industries due to their low density and closed cell structure. In recent years, various properties of polyurethane foams reinforced with different additives, such as morphological, mechanical and conductive properties, have been extensively investigated. However, the effect of magnetite/wollastonite hybrid systems on thermal transition and mechanical properties of rigid PU foam composites was not studied yet. The aim of this work is to explore thermal transition temperatures and mechanical properties of wollastonite (W) and magnetite (M) filled rigid polyurethane foams. The relationships between mechanical and thermal transition properties of the foams and in particular, the effect of the weight ratio of magnetite/wollastonite (1:3, 1:1 and 3:1) hybrid systems on the PU foam properties were studied. The foams produced were characterized by a Fourier transform infrared spectrometer, differential scanning calorimeter and tensile test device. As a result of the studies, it has been determined that the chemical structure of polyurethane foams is not affected by additives (magnetite and wollastonite). Thermal transition results revealed the presence of two main behaviors. In the first case an overall increase of the glass transition temperature of hard segments is observed and this behavior can be explained by the diminution of the mobility of polyurethane chains with the inclusion of magnetite and wollastonite particles between polymer chains. In the second case a general decrease tendency of the glass transition temperature of soft segments is obtained probably due to the presence of magnetite or wollastonite into the polymer matrix which hinders the formation of entanglements of polymer chains. A more important negative impact of wollastonite is observed in tensile properties of rigid PU foams compared to magnetite.

Keywords

Rigid Polyurethane Foam, Wollastonite, Magnetite, Thermal Transition, Mechanical Properties

Thanks

Kimpur Polyurethane (Turkey) is acknowledged for the supply of isocyanate and polyol.

Vollastonit ve Manyetit Katkılı Rijit Poliüretan Köpüklerin Isıl Geçiş ve Mekanik Özellikleri

Abstract

Poliüretan (PU) köpüklerin sahip olduğu düşük mekanik ve termal iletkenlik özelliklerine karşın işleme kolaylığı ve sert/esnek olarak üretilebildiklerinden dolayı otomotiv, yalıtım ve yapıştırıcı gibi uygulamalarda tercih edilen malzemelerdir. Sert poliüretan köpükler ise sahip oldukları düşük yoğunluk ve kapalı hücre yapısı özelliklerinden dolayı otomotiv, gemi ve inşaat sektörlerinde kullanılan malzemelerdir. Son yıllarda, farklı katkılarla takviye edilmiş olan poliüretan köpüklerin morfolojik, mekanik ve iletkenlik özellikleri gibi çeşitli özellikleri yoğun bir şekilde araştırılmaktadır. Ancak manyetit/vollastonit hibrit sistemlerin sert PU köpük kompozitlerin termal geçiş ve mekanik özellikleri üzerindeki etkisi henüz araştırılmamıştır. Bu çalışmanın amacı vollastonit (W) ve manyetit (M) takviyeli sert poliüretan köpüklerin termal geçiş sıcaklıkları ve mekanik özelliklerinin incelenmesidir. Köpüklerin mekanik ve termal geçiş özellikleri arasındaki ilişkiler ve özellikle manyetit/vollastonit (1:3, 1:1 ve 3:1) hibrit sistemlerin ağırlık oranlarının PU köpük özelliklerine etkisi incelenmiştir. Üretilen köpükler Fourier dönüşümlü kızılötesi spektrometre, diferansiyel taramalı kalorimetre ve çekme testi cihazı ile karakterize edilmiştir. Yapılan çalışmalar sonucunda, poliüretan köpüklerin kimyasal yapısının katkılardan (manyetit ve vollastonit) etkilenmediği tespit edilmiştir. Termal geçiş sonuçları iki ana davranışın varlığını ortaya çıkarmıştır. İlk durumda, sert segmentlerin camsı geçiş sıcaklığında genel bir artış gözlemlenmiştir ve bu davranış, polimer zincirleri arasında manyetit ve vollastonit partiküllerinin eklenmesinden dolayı poliüretan zincirlerinin hareketliliğinin azalması ile açıklanabilir. İkinci durumda, yumuşak segmentlerin camsı geçiş sıcaklığında gözlemlenen genel bir düşüş eğilimi, muhtemelen polimer matrisinde manyetit veya vollastonitin varlığından dolayı, polimer zincirleri arasında düğüm oluşumunun engellenmesinden kaynaklanmaktadır. Sert PU köpüklerde, vollastonitin manyetite göre çekme dayanımı özelliklerine daha belirgin bir olumsuz etkisinin olduğu görülmektedir.

Keywords

Rijit Poliüretan Köpük, Vollastonit, Manyetit, Termal Geçiş, Mekanik Özellikler

References

• Akkoyun , M., & Akkoyun, S. (2019). Blast furnace slag or fly ash filled rigid polyurethane composite foams: A comprehensive investigation. Journal of Applied Polymer Science, 136, 47433.
• Akkoyun, M., & Suvaci, E. (2016). Effects of TiO2, ZnO, and Fe3O4 nanofillers on rheological behavior, microstructure, and reaction kinetics of rigid polyurethane foams. Journal of Applied Polymer Science, 133, 43658.
• Alavi Nikje, M. M., Akbar, R., Ghavidel, R., & Vakili, M. (2015). Preparation and Characterization of Magnetic Rigid Polyurethane Foam Reinforced with Dipodal Silane Iron Oxide Nanoparticles Fe3O4@APTS/GPTS. Cellular Polymers, 34(3), 137-156.
• Alavi Nikje, M. M., Farahmand Nejad, M. A., Shabani, K., & Haghshenas, M. (2013). Preparation of magnetic polyurethane rigid foam nanocomposites. Colloid Polym Sci, 291, 903–909.
• Alavi Nikje, M. M., Noruzian, M., & Moghaddam, T. S. (2015). Novel Polyurethane Rigid Foam/Organically Modified Iron oxide Nanocomposites. Polymer Composites, 38(5), 877-883.
• Azarov, G. M., Maiorova, E. V., Oborina, M. A., & Belyakov, A. V. (1995). Wollastonite raw materials and their applications (a review). Glass and Ceramics, 52, 237-240.
• Ghosh, S., Ganguly, S., Remanan, S., Mondal, S., Jana, S., Maji, P. K., Das, N. C. (2018). Ultra-light weight, water durable and flexible highly electrical conductive polyurethane foam for superior electromagnetic interference shielding materials. Journal of Materials Science: Materials in Electronics, 29, 10177.
• Gu, S.-Y., Liu, L.-L., & Yan, B.-b. (2014). Effects of ionic solvent-free carbon nanotube nanofluid on the properties of polyurethane thermoplastic elastomer. J Polym Res, 21, 356.
• Król, P., Król, B., Pielichowska, K., & Špírková, M. (2015). Composites prepared from the waterborne polyurethane cationomers—modified graphene. Part I. Synthesis, structure, and physicochemical properties. Colloid Polym Sci, 293, 421–431.
• Liang, K., & Shi, S. Q. (2001). Nanoclay Filled Soy-Based Polyurethane Foam. Journal ofAppliedPolymer Science, 119, 857–1863.
• Moghaddam, S. T., & Naimi-Jamal, R. M. (2018). Reinforced magnetic polyurethane rigid (PUR) foam nanocomposites and investigation of thermal, mechanical, and sound absorption properties. Journal of Thermoplastic Composite Materials, 32(9), 1224-1241.
• Norshahli, M. S., Jun, L. H., & Zubir, S. A. (2018). Mechanical Properties of Palm Oil Polyol based Polyurethane Foam Reinforced Wollastonite Clay. Journal of Physics: Conference Series (p. 012041). Penang, Malaysia: IOP Publishing.
• Paciorek-Sadowska, J., Borowicz, M., Isbrandt, M., Czuprynski, B., & Apiecionek, L. (2019). The Use of Waste from the Production of Rapeseed Oil for Obtaining of New Polyurethane Composites. Polymers, 11, 1431.
• Paciorek-Sadowska, J., Czuprynski, B., Liszkowska, J., & Piszczek, K. (2012). Preparation of rigid polyurethane foams with powder filler. J Polym Eng, 32, 71-80.
• Patcharapon, S., Kalman, M., Timea, L.-K., & Csaba, K. (2018). Polyurethane elastomers with improved thermal conductivity part I: elaborating matrix material for thermal conductive composites. International Journal of Mechanical and Production Engineering, 6, 2320-2092.
• Pillai, P. K., Li, S., Bouzidi, L., & Narine, S. S. (2015). Metathesized palm oil polyol for the preparation of improvedbio-based rigid and flexible polyurethane foams. Industrial Crops and Products, 83, 568-576.
• Sarier, N., & Onder, E. (2007). Thermal characteristics of polyurethane foams incorporated with phase change materials. Thermochimica Acta, 454, 90–98.
• Sattar, R., Kausar, A., & Siddiq, M. (2015). Advances in thermoplastic polyurethane composites reinforced with carbon nanotubes and carbon nanofibers: A review. Journal of Plastic Film & Sheeting, 31(2), 86–224.
• Silva, A. M., Pereira, I. M., Silva, T. I., da Silva, M. R., Rocha, R. A., & Silva, M. C. (2020). Magnetic foams from polyurethane and magnetite applied as attenuators of electromagnetic radiation in X band. Journal of Applied Polymer Science, 49629.
• Sri-ngo, W. (2008). Effects of Calcium Carbonate Fillers on Mechanical Properties of Flexible Polyurethane Foam. Bangkok, Tayland: Chulalongkorn University.
• Usman, A., Zia, K. M., Zuber, M., Tabasum, S., Rehman, S., & Zia, F. (2016). Chitin and chitosan based polyurethanes: A review of recent advances and prospective biomedical applications. International Journal of Biological Macromolecules, 86, 630–645.
• Yang, Z.-G., Zhao, B., Qin, S.-L., Hu, Z.-F., Jin, Z.-K., & Wang, J.-H. (2004). Study on the Mechanical Properties of Hybrid Reinforced Rigid Polyurethane Composite Foam. Journal of Applied Polymer Science, 92, 1493–1500.
• Zhou, L., Li, G., An, T., & Li, Y. (2010). Synthesis and characterization of novel magnetic Fe3O4/polyurethane foam composite applied to the carrier of immobilized microorganisms for wastewater treatment. Research on Chemical Intermediates , 36, pages277–288.