Combined Effect of Shear and Fibrous Fillers on Orientation-Induced Crystallization in Discontinuous Aramid Fiber-Isotactic Polypropylene Composites

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Polymer

DOI:https://doi.org/10.1016/j.polymer.2007.11.024· OSTI ID:959880

Larin, B; Avila-Orta, C; Somani, R; Hsiao, B; Marom, G

The shear-induced crystallization behavior in isotactic polypropylene (iPP) composite melt containing short aramid fibers was investigated by means of WAXD (wide-angle X-ray diffraction) and SAXS (small-angle X-ray scattering) techniques using synchrotron radiation. The study was carried out in a post-shear isothermal crystallization mode at temperatures of 140-160 C. Parameters pertaining to the crystallization morphology and kinetics were analyzed, including total crystallinity, orientated crystalline and amorphous fractions, dimensions of the formed shish-kebab structure, as well as induction time and rate of crystallization. The individual contributions of shear and fibers were evaluated and the combined effect was compared. The results clearly indicated that the effect is synergistic rather than additive.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 959880
• Report Number(s): BNL--82866-2009-JA
• Journal Information: Polymer, Journal Name: Polymer Journal Issue: 1 Vol. 49; ISSN 0032-3861; ISSN POLMAG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
ARAMIDS
CRYSTALLIZATION
DIMENSIONS
FIBERS
FILLERS
INDUCTION
KINETICS
MORPHOLOGY
POLYPROPYLENE
SCATTERING
SHEAR
SYNCHROTRON RADIATION
X-RAY DIFFRACTION
national synchrotron light source