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| Titel: |
STRUCTURE-PROPERTY RELATIONSHIPS OF MICROFIBRILLAR REINFORCED BLENDS OF LINEAR POLYCONDENSATES |
| Auteur: |
Evstatiev, M. Schultz, J. M. Oliveira, M. J. Fakirov, S. Krasteva, B. Friedrich, K. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 51 (2002) nr. 4 pagina's 351-367 |
| Jaar: |
2002-04 |
| Inhoud: |
Binary microfibrillar reinforced composites are obtained by melt-blending of poly(ethylene terephthalate) (PET) and polyamide 6 (PA6), as well as polyamide 66 (PA66) and PA6 (both 40/60 by wt) in the presence of a catalyst, followed by cold drawing of the bristle to about 3.5 times and annealing at 220 or 240°C. The blends are studied by X-ray diffraction, scanning electron microscopy (SEM), light microscopy and static mechanical testing. SEM and light microscopy reveal different blend morphologies due to differences in the miscibility of the homopolymers: the PA66/PA6 blend is morphologically more homogeneous, than the PET/PA6 blend. Annealing at 240°C results in preservation of the high orientation of PET and PA66 while the PA6 portions of the two blends are partially disoriented, much more for the PET/PA6 blend as concluded from the X-ray data. Annealing at 240°C suggest also transreactions leading to the in situ generation of block copolymers in addition to the generated ones during blend mixing in the extruder which improve the compatibility of the blend components. These physical and chemical changes affect the mechanical properties of the fibrillar reinforced blends and composites. The Young's moduli (E) and tensile strength ( σt ) of the drawn blends are 5-6 and 7-9 times higher than those of the asextruded samples. Heat treatment at 220°C results in a slight (for PA66/PA6) and stronger (for PET'PA6 blend) decrease of the σt while E remains unchanged. A stronger decrease of E in both blends and of σt in PA66/PA6 sample has been observed after annealing at 240°C. Nevertheless, E and σt of the last samples are about 3 times higher than those for the neat PA6. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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