Studies on PEBAX/organoclay nanocomposites by meltintercalation process: Effect of organoclay surface

Abstract

In this study, the polyetherblock amide (PEBAX) ® nanocomposites with 2.5 % and 5 wt.% organoclay, based on Cloisite 30B (montmorillonite intercalated with dimethyl, 2-ethyl hexyl hydrogenated tallow alkyl ammonium cation), were prepared by the melt-intercalation process. The structural properties, thermal behaviors and the mechanical properties were characterized using the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), melt flow index (MFI), differential scanning calorimetry (DSC), thermogravimetry analyses (TGA), transition electron microscopy (TEM), scanning electron microscopy (SEM) and the tensile test. The XRD analysis indicated the formation of intercalated PEBAX nanocomposites. The TGA results revealed that the addition of 2.5 wt.% nanoclay improved the thermal properties, while the nanocomposite with 5 wt.% nanoclay did not enhance the thermal stability. The DSC analysis indicated that, in the case of PEBAX with 2.5 wt.% organoclay, each peak was related to the fusion of the crystalline fraction of the poly ether and poly amide affected blocks. On the contrary, regarding the PEBAX with 5 wt.% nanoclay, only the peak related to polyamide was changed. Interestingly, the tensile modulus increased with the incorporation of 2.5 wt.% clay, but it decreased in PEBA 5. The elongation at break reduced with the incorporation of the clay, attaining a minimum value at the clay concentration of 2.5 wt.%, and followed by an increase at the clay concentration of 5 wt.%.

Mechanical Properties of Nanofilled Polypropylene Composites

“…When compared to PP, the differences appear at 1046 cm -1 where Si-O-Si from the Cloisite 30B silicate generates a more intense peak [18] and at 1653 cm -1 value at which the signal intencity increases, fact that is generated by the bending vibration of montmorillonite intermediate layer [19].…”

“…There are studies that discuss the fact that simple Cloisite 30B powder decomposition starts around 174 °C [20], through degradation of organic groups from the modifying agent (quaternary ammonium salts) [18].…”

Silver ion beam irradiation effects on poly(lactide-co-glycolide) (PLGA)/clay nanocomposites

“…The relative intensity of very intense Si-O-Si stretching band (1,048 cm -1 ) of Cloisite Ò 30B is most sensitive to the degree of intercalation and Si-O bending bands (523 and 465 cm -1 ) of 30B [34] in PLGA/30B show the dispersion of 30B in the polymer matrix. These bands were observed at high fluence, 3 9 10 12 ions/cm 2 , indicating that there is a strong interaction between the clay layers and polymer chain segments due to H-bond formation between Si-O and Si-OH group of 30B with C=O group of PLGA and also confirming some intercalation of polymer chains into the clay galleries of OMMT.…”

Synthesis of ethylene terephthalate and ethylene naphthalate (PET‐PEN) block‐co‐polyesters with defined surface qualities by tailoring segment composition

“…Polymer blends represent important key engineering materials due to the wide range of technological performance profiles that can be adjusted by proper selection of blending components and functional fillers . Even by suitable combination of commodity polymers and incorporation of organic or inorganic particles the properties of polymer blends can be improved and their performance specifications can be extended at reasonable costs . Fillers such as layered silicates or carbon nanotubes are applied to increase mechanical or barrier properties of polymers.…”