Premium
The effect of layered double hydroxides dispersion on thermal and mechanical properties of poly(vinyl chloride)/poly(methyl methacrylate) blends
Author(s) -
Pérez Amaro Lucía,
Coiai Serena,
Conzatti Lucia,
Manariti Antonella,
Ciardelli Francesco,
Passaglia Elisa
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4472
Subject(s) - thermogravimetric analysis , materials science , vinyl chloride , differential scanning calorimetry , thermal stability , vicat softening point , fourier transform infrared spectroscopy , composite material , layered double hydroxides , methyl methacrylate , dispersion (optics) , poly(methyl methacrylate) , polymer , hydroxide , polymer chemistry , chemical engineering , softening point , copolymer , physics , optics , thermodynamics , engineering
Abstract Poly(vinyl chloride) ( PVC )/layered double hydroxide ( LDH ) composites and PVC /poly(methyl methacrylate) ( PMMA )/ LDH composites were prepared via solution intercalation into PVC using both unmodified and organo‐modified LDHs and variable‐molecular‐weight PMMA as additional components. The LDH dispersion was investigated using X‐ray diffraction analysis and electron microscopy in scanning and transmission modes. Spotlight fourier transform infrared ( FTIR ) chemical imaging analysis was also used to obtain a deeper insight into the dispersion of polymer phases and LDH segregation. Thermal properties were determined using thermogravimetric analysis and differential scanning calorimetry; moreover, a preliminary investigation of mechanical properties in tensile mode and evaluation of the Vicat softening temperature were carried out. The morphological analysis of PVC / LDH and PVC / PMMA / LDH composites evidenced in both cases the presence of disordered micro‐aggregates with loss of the LDH crystallographic symmetry depending on the amount and molecular weight of PMMA . In particular, in the case of PVC / PMMA / LDH composites, the FTIR imaging analysis showed that PMMA mostly segregated in the LDH phase. However, even if the degree of LDH dispersion was not elevated (micro‐aggregates with disordered structures and size ranging from 0.5 up to 11 µm were evidenced), thermal stability and mechanical properties of the composites were improved with a synergic effect of PMMA and LDH . © 2013 Society of Chemical Industry