Title of article :
In situ synchrotron SAXS\WAXD studies during melt spinning of modified carbon nanofiber tand isotactic polypropylene nanocomposite
Author/Authors :
Sics، Igors نويسنده , , Hsiao، Benjamin S. نويسنده , , Chu، Benjamin نويسنده , , Ran، Shaofeng نويسنده , , Burger، Christian نويسنده , , Yoon، Kyunghwan نويسنده , , Fang، Dufei نويسنده , , Kim، Kwangsok نويسنده , , Avila-Orta، Carlos نويسنده , , Keum، Jongkahk نويسنده , , Cookson، David نويسنده , , Shultz، Dave نويسنده , , Lee، Myungae نويسنده , , Viccaro، Jim نويسنده , , Ohta، Yasuo نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
-801
From page :
802
To page :
0
Abstract :
The structural development of a nanocomposite, containing 95 wt% isotactic polypropylene (iPP) and 5 wt% modified carbon nanofiber (MCNF), during fiber spinning was investigated by in situ synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) techniques. The modification of carbon nanofibers (CNFs) was accomplished by a chemical surface treatment using in situ polymerization of olefin segments to enhance its compatibility with iPP, where the iPP\MCNF nanocomposite was prepared by twostep blending to ensure the dispersion of MCNF. X-ray results showed that at low spin-draw ratios, the iPP\MCNF nanocomposite fiber exhibited much higher iPP crystalline orientation than the control iPP fiber. At higher spin-draw ratios, the crystalline orientation of the nanocomposite fiber and that of the pure iPP fiber was about the same. The crystallinity of the composite fiber was higher than that of the control iPP fiber, indicating the nucleating effect of the modified carbon nanofibers. The nanocomposite fiber also showed larger long periods at low spin-draw ratios. Measurements of mechanical properties indicated that the nanocomposite fiber with 5 wt% MCNF had much higher tensile strength, modulus and longer elongation to break. The mechanical enhancement can be attributed to the dispersion of MCNF in the matrix, which was confirmed by SEM results.
Journal title :
COLLOID & POLYMER SCIENCE
Serial Year :
2004
Journal title :
COLLOID & POLYMER SCIENCE
Record number :
116073
Link To Document :
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