Black-pigmented polypropylene materials for solar thermal absorbers – Effect of carbon black concentration on morphology and performance properties

Povacz, M.; Wallner, Gernot M.; Lang, Reinhold W.

doi:10.1016/j.solener.2014.09.024

Cited by 17 publications

(6 citation statements)

References 13 publications

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“…Grabmann et al [7] investigated the aging behavior of alpha- and beta-nucleated polypropylene random copolymers in hot air. This environment was chosen based on previous studies by this group, where hot air was shown to be more severe in terms of aging of PP compared to hot non-chlorinated water [49,50,51,52]. In the study, micro-sized specimens of the ethylene co-monomer based PP-R grades were exposed to hot air at five different temperatures ranging from 95 to 135 °C.…”

Section: Discussionmentioning

confidence: 99%

Chlorinated Water Induced Aging of Pipe Grade Polypropylene Random Copolymers

et al. 2019

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Polypropylene random copolymers (PP-R) are common materials for pressurized hot water pipes. In many pipe systems, potable water is disinfected by chlorine to prevent waterborne diseases. This paper deals with hot chlorinated water induced aging of two PP-R grades with varying morphology. One material had a conventional monoclinic α crystal form (PP-Rα), whereas the other was explicitly beta-nucleated resulting in a trigonal β crystal form with a fine spherulite structure (PP-Rβ). Micro-sized specimens with a thickness of 100 µm were used for aging experiments at 60 °C in chlorinated water with 5 mg/L free chlorine, and aging indicators were monitored for exposure times of up to 2000 h. On the other hand, superimposed mechanical-environmental tests were carried out by using cracked round bar specimens with a diameter of 14 mm to determine the fatigue crack growth (FCG) resistance of both PP-R grades at 60 °C in non-chlorinated and chlorinated water. PP-Rβ was found to outperform PP-Rα with an about 30% higher time-to-embrittlement value of 2000 h. Furthermore, PP-Rβ exhibited an enhanced FCG resistance in both non-chlorinated and chlorinated water. The effect of chlorine content on the deterioration of the FCG resistances was significantly more pronounced for PP-Rα.

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Section: Discussionmentioning

confidence: 99%

Chlorinated Water Induced Aging of Pipe Grade Polypropylene Random Copolymers

et al. 2019

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“…cellulose, waxes) as cotton lint (National Cotton Council, 2015b). The drip irrigation belt samples are made of thick polyethylene and black color concentrate (carbon black) which resulted in strong absorption of light (Povacz et al, 2014). In addition, the use of solid concentrates can significantly impact the diffuse reflectance of the fiber (Rodgers, 2002).…”

Section: Spectra Extraction and Normalizationmentioning

confidence: 99%

Shortwave infrared hyperspectral reflectance imaging for cotton foreign matter classification

Zhang

et al. 2016

Computers and Electronics in Agriculture

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“…CB merupakan reinforcing filler, bahan pengisi yang memperbaiki sifat mekanis vulkanisat. CB dapat menjadi penguat yang baik jika partikel CB terdispersi merata dalam matriks karet, namun pada jumlah tertentu juga dapat menurunkan beberapa sifat mekaniknya (Sangwichien et al, 2008;Dijkhuis et al, 2009;Povacz et al, 2014). Maka dalam studi ini dimungkinkan terjadi overloading filler, dimana pemberian bahan pengisi (filler) yang terlalu banyak membuat partikel CB tidak terdispersi dengan baik dalam molekul karet, sehingga dimungkinkan ikatan yang terjadi lebih banyak terdapat pada EPDM dengan 50 phr CB daripada EPDM dengan 60 dan 70 phr CB.…”

Section: Hasil Dan Pembahasanunclassified

Karakteristik termogravimetri dan kinetika dekomposisi EPDM dengan bahan pengisi carbon black

Mayasari

Yuniari

2016

MKKP

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The thermal characteristics of a material are important to learn in order to know the thermal stability of the materials. Ethylene propylene diene monomer (EPDM) is a synthetic rubber that is widely used in industry dueto its resistance to aging, ozone, and chemicals. The kinetic parameters and thermal decomposition of vulcanized EPDM were studied using thermogravimetric method with various vulcanization systems (efficient, semi-efficient, and conventional vulcanization system) and various carbon black (CB) as filler (50, 60, and 70 phr ABSTRAKKarakteristik termal suatu material penting untuk dipelajari untuk mengetahui stabilitas termal bahan tersebut. Etilen propilen diena monomer (EPDM) adalah salah satu karet sintetis yang banyak digunakan dalam industri karena ketahanan terhadap aging, ozon, dan kimia yang baik. Pada studi ini akan dipelajari parameter kinetika dan sifat dekomposisi termal vulkanisat EPDM dengan metode termogravimetri dari berbagai variasi sistem vulkanisasi (efisien, semi-efisien, dan konvensional) dan variasi carbon black (CB) (50,60, dan 70 phr) sebagai bahan pengisi. Dekomposisi terjadi dalam dua tahap; oksidasi EPDM dan hilangnya bahan mudah menguap kemudian dekomposisi EPDM. Parameter kinetika dekomposisi termal didekati dengan persamaan Coats Redfern. Energi aktivasi dan massa yang terdekomposisi meningkat dengan berkurangnya kandungan CB. Vulkanisat EPDM dengan bahan pengisi CB memiliki ketahanan cukup baik terhadap dekomposisi termal. Proses dekomposisi dapat dilihat secara detail pada paper ini.Kata kunci: EPDM, dekomposisi termal, kinetika, termogravimetri, carbon black. PENDAHULUANMaterial polimer yang telah mengalami proses pengolahan, penggunaan, dan penyimpanan akan mengalami degradasi karena pengaruh suhu dan waktu. Degradasi ini dapat disebabkan oleh bahan kimia seperti pemutusan ikatan dan oksidasi atau perubahan fisik yang menghasilkan bahan dengan sifat yang berbeda dalam struktur polimernya. Pada umumnya sifat fisika dan sifat mekanis akan menurun. Tingkat perubahan sifat termal oleh pengaruh suhu disebut sebagai ukuran stabilitas termal suatu bahan (Alneamah & Almaamori, 2015).EPDM adalah karet nonpolar dan memiliki sedikit ikatan tidak jenuh sehingga memiliki sifat ketahanan yang baik terhadap bahan kimia, cuaca, dan pengusangan. Rumus struktur EPDM dapat dilihat pada Gambar 1. EPDM adalah salah

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Black-pigmented polypropylene materials for solar thermal absorbers – Effect of carbon black concentration on morphology and performance properties

Cited by 17 publications

References 13 publications

Chlorinated Water Induced Aging of Pipe Grade Polypropylene Random Copolymers

Chlorinated Water Induced Aging of Pipe Grade Polypropylene Random Copolymers

Shortwave infrared hyperspectral reflectance imaging for cotton foreign matter classification

Karakteristik termogravimetri dan kinetika dekomposisi EPDM dengan bahan pengisi carbon black

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