e-journal

Structural evolution and mechanical properties of iPP melt spun fibers subjected to thermal treatment

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Abstract:
An investigation of the structure and mechanical behavior of melt-spun isotactic polypropylene (iPP) fibers subjected to thermal treatment in an inert atmosphere is described. Two iPP formulations, Basell Pro-fax PH835 and ExxonMobil Achieve 3854, synthesized by the Ziegler-Natta and metallocene catalysts respectively, and spun at take-up velocities of 1000 to 3000 m/min are considered. The evolution of the structure is monitored withWAXS, SAXS, Raman spectroscopy and birefringence measurements. The fibers spun at 1000 m/min are predominantly mesomorphic, while those spun at 3000 m/min are semi-crystalline in the as-spun state. Thermal treatment for 20 min at 145 °C erases the processing history and increases the crystallinity of all samples. It is shown that thermal treatment leads to the formation of a secondary set of kebab lamellae which are thinner than the original ones, separated by thicker lamellae. The spatial variability of the lamellar thickness and of interlamellar spacings is estimated from the SAXS data and it is concluded that the variability is rather pronounced in all samples. Both annealed and non-annealed fibers are subjected to monotonic and cyclic mechanical testing. Large differences are seen in the behavior of non-annealed fibers processed in different conditions. The
monotonic mechanical behavior of the annealed fibers is not very much different from that of the corresponding nonannealed fibers. The central difference between annealed and non-annealed samples is observed in the cyclic behavior; annealed samples containing lamellae with bimodal distribution of thickness exhibit bimodal hysteresis curves while this feature is not observed in non-annealed

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Ketersediaan

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Informasi Detail

Judul Seri

Polymmer Research

No. Panggil

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Penerbit

: Springer Science., 2016

Deskripsi Fisik

J Polym Res (2016) 23:59

Bahasa

English

ISBN/ISSN

DOI 10.1007/s10965-0

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

Volume 23, Issue 3, March 2016

Subjek

Polymer Research

Info Detail Spesifik

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Pernyataan Tanggungjawab

deliza

Versi lain/terkait

Lampiran Berkas

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