Poly(c-caprolactone) (PCL) was found to be miscible with uncured polyester resin, i.e. oligoester (OER), as shown by the existence of a single glass transition temperature (T,) in each blend. However, PCL was judged to be partially miscible with crosslinked polyester resin (PER) which was concluded from the results of thermal analysis. Fourier-transform infrared (FT-i.r.) studies revealed that intermolecular hydrogen bonding interaction between the components is an important driving force to the miscibility of PCL/OER blends and the partial miscibility of crosslinked PCL/PER blends. The importance of entropy contribution to the miscibility of thermosetting polymer blends is also shown from the FT-i.r. results. The spherulitic morphology of the blends was remarkably affected by crosslinking. The birefringent spherulites were observed in the uncured PCUOER blends, whereas a distinct pattern of extinction rings, which was absent either in the pure PCL or in the uncured PCUOER blends, was apparent in the crosslinked PCL/PER blends.
Посилання на статтю:
Miscibility and crystallization of thermosetting polymer blends of unsaturated polyester resin and poly(E-caprolactone) / Qipeng Guo, Haifeng Zheng // Polymer. – 1999. – N 40. – P. 637–646.