Orientated Crystallization in Discontinuous Aramid Fiber/isotactic Polypropylene Composites under Shear Flow Conditions
Melt blends of short aramid fibers (AF) and isotactic polypropylene (iPP) are subjected to shear at 145 C and the structural evolution and final morphology are examined by in situ synchrotron X-ray scattering/diffraction and high-resolution scanning electron microscopy, respectively. The results indicate that the presence of short AFs significantly enhances the crystallization of iPP. It is argued that shear flow in this system exerts a twofold orientating action, namely, on the bulk iPP molecules and on the short AFs. The resultant crystalline morphology reflects the combined effects of crystallization on orientated iPP molecules to facilitate a shish kebab morphology and at the interface of the aligned fibers, to form transcrystallinity.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 913901
- Report Number(s):
- BNL--78469-2007-JA
- Journal Information:
- J. Appl. Polym. Sci., Journal Name: J. Appl. Polym. Sci. Vol. 98; ISSN 0021-8995; ISSN JAPNAB
- Country of Publication:
- United States
- Language:
- English
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