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| Titel: |
Improvement of Mechanical Properties of Poly(butylene terephthalate)/Polyarylate Blends with Various Compositions via Zone Drawing-Zone Annealing |
| Auteur: |
Evstatiev, M. Krasteva, B. Fakirov, S. Oliveira, M. J. Serhatkuluc, T. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 50 (2001) nr. 2 pagina's 215-233 |
| Jaar: |
2001-08-01 |
| Inhoud: |
Poly(butylene terephthalate)/polyarylate (PBT/PAr) blends of various compositions were subjected to a series of thermal and mechanical treatments. The evolution of the structure together with the static mechanical properties of produced fibers were investigated. It was found that zone drawing-zone annealing at 140 and 190d` C markedly improves the blend mechanical properties: the Young modulus increases up to 5 times, the tensile strength-up to 10 times (compared to neat PBT) and up to 5 times (compared to neat PAr), the elongation at break drops 50-100 times with the rise of PAr content. The highest values of modulus and strength are obtained for blends containing between 10 and 35% (by wt) PAr. The observed improvement is explained by the substantial chain axis orientation and enhanced crystallization. of PBT offered by the zone drawing-zone annealing process, as proven by wide angle X-ray diffraction and birefrigent tests. Finally, a conclusion is drawn that after the appropriate treatments the PBT/PAr blends represent microfibrillar reinforced composites, similarly to other polymer blends for which the same improvements in the mechanical properties are known to be due to the microfibrillar reinforcing effect. The PBT microfibrils are visualized by observations using scanning electron microscope. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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