Based on evidence from differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and Fourier-transform infrared (FTIR) spectroscopy, a new stereocomplex crystal (DSC T m = 175 °C, with WAXD 2Î = 10.0°and 12.5°) is proven for the first time between structurally dissimilar chiral poly(L-lactic acid) (PLLA) and syndiotactic poly(methyl methacrylate) (sPMMA). There is a strong complexing capacity only between low molecular weight PLLA and sPMMA, in miscible state, at specific weight fractions (70:30). The complexing capacity is more significant when the mixtures are melt-crystallized at T c = 110°C or lower, and the intensity of this complex can be further enhanced if it is annealed between 100 and 160°C, below its T m = 175°C. The new complex crystal can be formed only between PLLA and sPMMA, but not with isotactic or atactic PMMA.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry