Biodegradable polyester blend and copolyesters studied by positron annihilation and other methods

• Autorzy: Dębowska M. , Rudzińska-Girulska J. , Serwadczak M. , Kiersnowski A. , Pigłowski J.
• Języki publikacji: EN

Abstrakty

EN

Two polyesters, i.e. an aromatic one: poly(butylene terephthalate) – PBT and an aliphatic one: poly(ĺ- -caprolactone) – PCL were mixed in melt to obtain a biodegradable product. DSC, 1H NMR, SEM, WAXS, SAXS, BOD and PALS measurements were performed to study the homopolymers as well as their physical blend and copolyesters. The latter were obtained due to the transesterification reaction. Ortho-positronium (o-Ps) annihilation lifetimes were used to create the distributions of free volume. The progressive changes in probability density function of free volume, i.e. increase in large free volume holes contribution to the total free volume, appearing when going from the homopolymers to the blend and then to the copolyesters reflect the influence of: the addition of aliphatic polyester, the weight fraction of it in the composition and transesterification. The higher contribution of larger free volume holes corresponds well with the reduced crystallinity of compositions revealed in X-ray diffraction and the worsening of the regularity of structure of the macromolecules involved in formation of crystals, deduced from the 1H NMR.

Słowa kluczowe

EN

mixing of polymers; polyesters; transesterification; positron annihilation; positronium; free volume

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2010
• Tom: Vol. 55, No. 1
• Strony: 57--64
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Dębowska M.

autor

Rudzińska-Girulska J.

autor

Serwadczak M.

autor

Kiersnowski A.

autor

Pigłowski J.

Bibliografia

• 1. Baker JR, Milke W, Michelcic JR (1999) Relationship between chemical and theoretical oxygen demand for specific classes of organic chemicals. Water Res 33:327–334
• 2. Buttafava A, Consolati G, Mariani M, Quasso F, Ravasio U (2005) Effects induced by gamma irradiation of different polyesters studied by viscometry, thermal analysis and positron annihilation spectroscopy. Polym Degrad Stab 89:133–139
• 3.Dlubek G (2008) Positron annihilation spectroscopy. Seidel A (ed) Encyclopedia of polymer science and technology. John Wiley & Sons, Hoboken
• 4.4. Eldrup M, Lightbody D, Sherwood JN (1981) The temperature dependence of positron lifetimes in solid pivalic acid. J Chem Phys 63:51–58
• 5. Faupel F, Kanzow J, Günther-Schade K, Nagel C, Sperr P, Kögel G (2004) Positron annihilation spectroscopy in polymers. Mater Sci Forum 445;6:219–223
• 6. Hill AJ, Weinhold S, Stack GM, Tant MR (1996) Effect of copolymer composition on free volume and gas permeability in poly(ethyleneterephthalate)-poly(1,4 cyclohexylenedimethylene terephthalate) copolyesters. Eur Polym J 32:843–849
• 7. Kansy J (1996) Microcomputer program for analysis of positron annihilation lifetime spectra. Nucl Instrum
• 8. Kim YJ, Park OO (1999) Miscibilities and rheological properties of poly(butylenes succinate)-poly(butylenesterephthalate). J Appl Polym Sci 72:945–951
• 9. Mariani M, Ravasio U, Varoli V, Consolati G, FaucitanoA, Buttafava A (2007) Gamma irradiation of polyesterfilms. Radiat Phys Chem 76:1385–1389
• 10.OxiTop instruction manual (2006) Wissenschaftlich--Technische Werkstätten GmbH, Weilheim
• 11.Park SS, Chae H, Im SS (1998) Transesterification and crystallization behavior of poly(butylenes succinate)/poly(butylenes terephthalate. J Polym Sci, Part B: Polym Chem 36:146–156
• 12. Pisula W, Pigłowski J, Kummerlöwe C (2006) Preparation and characterization of copolyesters of PTMS and PBT. Polimery 51:341–350
• 13. Porter RS, Wang LH (1992) Compatibility and transesterification in binary polymer blends. Polymer 33:2019–2030
• 14. Sawyer CN, McCarty PL (1978) Chemistry for environmental engineering. McGraw Hill Book, New York
• 15. Simon GP, Zipper MD, Hill AJ (1994) On the analysis of positron annihilation lifetime spectroscopy data in semicrystalline miscible polymer blend system. J Appl Polym Sci 52:1191–1202
• 16. Tao SJ (1972) Positronium annihilation in molecular substances. J Chem Phys 56:5499–5510
• 17. Yampolski YuP (2007) Metody izucheniya svobodnogo objema. Uspekhii Khimii 76:66–87
• 18. Zipper MD, Simon GP, Cherry P, Hill A J (1994) The effect of crystallinity on chain mobility and free volume in the amorphous regions of a miscible polycarbonate/polyester blend. J Polym Sci, Part B: Polym Phys 32:1237–1247
• 19. Zipper MD, Simon GP, Tant MR, Small JD, Stack GM,Hill AJ (1995) A free volume study of miscible polyester blends. Polym Int 36:127–136