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Poly(para-dioxanone) and poly(l-lactic acid) blends: Thermal, mechanical, and morphological properties

Pezzin, A. P. T., Alberda van Ekenstein, G. O. R., Zavaglia, C. A. C., ten Brinke, G. & Deuk, E. A. R. 20-Jun-2003 In : Journal of Applied Polymer Science. 88, 12, p. 2744-2755 12 p.

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DOI

  • A.P.T. Pezzin
  • G.O.R. Alberda van Ekenstein
  • C.A.C. Zavaglia
  • G. ten Brinke
  • E.A.R. Deuk

Blends of two semicrystalline polymers, poly(L-lactic acid) (PLLA) and poly-p-dioxanone (PPD) have been prepared by solvent casting in different compositions. Thermal, morphological, and mechanical properties of the blends were studied using modulated differential scanning calorimetry, wide-angle X-ray diffractometry, scanning electron microscopy (SEM), polarizing light microscopy (PLM), and tensile tests. Thermal analysis showed two glass transition temperatures nearly constant and equal to the values of the homopolymers and constant values of melting temperature (T-m) for all blend compositions, suggesting that both polymers are immiscible. The PLM and SEM observations validated these results, and showed the different morphology obtained by changing the composition of the blend. The blends 40/60, 50/50, and 60/40 presented a clearly macroseparated system, while the 20/80 and 80/20 blends presented better homogeneity, probably due to the low amount of one component in the other. It was found by PLM that PPD is able to crystallize according to a spherulitic morphology when its content is above 40%. Under this content, the crystallization of PPD is hardly observed. The blend 20/80 is more flexible, and tough material and neck formation during elongation is also observed, due to PPD, which may act as a plasticizer. (C) 2003 Wiley Periodicals, Inc.

Original languageEnglish
Pages (from-to)2744-2755
Number of pages12
JournalJournal of Applied Polymer Science
Volume88
Issue number12
StatePublished - 20-Jun-2003

    Keywords

  • biomaterials, bioreabsorbable polymers, blends, poly(lactic acid), poly(p-dioxanone), ENANTIOMERIC POLY(LACTIC ACID)S, STEREOCOMPLEX FORMATION, PHYSICAL-PROPERTIES, ACETONITRILE SOLUTION, ALIPHATIC POLYESTERS, POLY(D-LACTIC ACID), BINARY BLENDS, CRYSTALLIZATION, MISCIBILITY, MELT

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