New clay-reinforced nanocomposites based on a polycarbonate/polycaprolactone blend

Abstract

New clay‐reinforced polymer nanocomposites based on poly(carbonate of bisphenol A) (PC)/poly(caprolactone) (PCL) blends have been obtained by mixing PC with minor amounts of PCL in which a widely dispersed organically modified montmorillonite (OMMT) was present. Upon the addition of PCL/OMMT, the Tg of the matrix and the viscosity of the nanocomposites decreased and therefore processability increased. This was attributed to both the presence of PCL and the migration of some surfactant to the polymeric matrix. The intercalation level observed by X‐Ray diffraction was similar to that obtained in PC nanocomposites, and the dispersion level was at least similar, as observed directly by transmission electron microscopy and indirectly by modulus measurements. However, the benefits of both clay and PCL were present together in the nanocomposites, besides the improved processability and the expected improvement of barrier properties. This led to increases in modulus of elasticity, yield strength, and although slight, mostly in ductility. POLYM. ENG. SCI., 46:864–873, 2006. © 2006 Society of Plastics Engineers

Structure and Mechanical Properties of Nanocomposites Based on an Amorphous Copolyester

“…The opposite effect -that is, a decrease in the T g of the matrix in presence of OMMT -has been observed in PA6, [52] polyamide 11, [53] poly(methyl methacrylate) [54] and polycarbonate; [55] this was attributed to a migration of the surfactant during melt mixing, resulting in a plasticizing effect. [45,55] The existence [46] of a thin interface layer that tends to enhance the segmental dynamics of the polymer chains and to lower the T g has been also found.…”

“…[45,55] The existence [46] of a thin interface layer that tends to enhance the segmental dynamics of the polymer chains and to lower the T g has been also found.…”

“…A case where the OMMT does not contribute to birefringence, as measured by FTIR, has also been observed in PETG-based [36] PNs. A linear increase in properties such as the modulus is often seen in PNs, [4,55] although at high OMMT content the slope decreases. This decrease in slope is a consequence [4] of the difficulty to disperse the OMMT at high concentrations.…”

RETRACTED ARTICLE: Influence of nanoclays and nano-TiO2 on the mechanical and thermal properties of polycarbonate nanocomposite

“…Hitherto many works have been reported on the preparation and characterization of PC/clay and PC alloy/clay nanocomposites (PCNs). [4][5][6][7][8][9][10][11][12][13][14][15] The effect of clay loading on the mechanical behavior and melt state linear viscoelastic properties of intercalated PC nanocomposites was investigated by Alex J. Hsieh et al 16 They observed that these nanocomposites also exhibited a significant decrease in the extent of tensile elongation and ductility with respect to the nanoclay incorporation. A concomitant decrease in the rheological properties at high frequencies was also observed, and was consistent with the lowering of the molecular weight of PC, particularly near or above the percolation threshold of nanoclay.…”

Development and characterization of novel nanobiocomposites containing various nanofillers to improve barrier and other physical properties of interest in food packaging and coating applications

“…In the case of PCL four methodologies have been used to prepare nanocomposites of PCL namely, in-situ polymerization 23,[121][122][123][124][125] , solution casting 126 , melt mixing 19,[127][128][129][130][131][132][133][134][135] and a master batch method.…”