SEARCH

SEARCH BY CITATION

Keywords:

  • polyesters;
  • NMR;
  • blended;
  • compatibility

Abstract

In this study, polycaprolactone/C60 (PCL/C60) hybrids were prepared via a melt-blending method. To enhance the compatibility between PCL and C60, the acrylic acid-grafted polycaprolactone (PCL-g-AA) was first transformed to PCL[BOND]NH2 by mixing with 1,6-diaminohexane, while C60 was oxidized using a mixture of H2SO4/HNO3 and NaOH to derive C60 fullerol (C60[BOND]OH). Thereafter, C60[BOND]OH and PCL[BOND]NH2 were used to replace PCL and C60, respectively. The resulting products were characterized using FTIR, solid-state 13C- and 1H- NMR, TGA, DMA, SEM, TEM, and Instron mechanical testing. Because of the formation of [BOND]NHCO groups through the reaction between amino groups of PCL[BOND]NH2 and hydroxyl groups of C60[BOND]OH, thermal and mechanical properties of the PCL[BOND]NH2/C60[BOND]OH composite were significantly superior to those of PCL/C60. The optimal blend was the 5 wt % C60[BOND]OH with PCL[BOND]NH2, producing an 84°C increase in initial decomposition temperature (IDT). C60[BOND]OH in excess of 5 wt % aggregated and caused separation of the organic and inorganic phases, lowering their compatibility.© 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010