The role of organically modified layered silicate in the breakup and coalescence of droplets in PBT/PE blends

Inorganic nanofillers are often added into polymer/elastomer blends as a third component to modify their performance. This work aims to clarify the role of interface-localized spherical nanoparticles in determining the impact toughness of polymer blends. The selective distribution of titanium dioxide (TiO2) nanoparticles in poly(L-lactide)/poly(ether) urethane (PLLA/PU) blends was investigated by using scanning electron microscope. It is interesting to find that, regardless of the method of TiO2 introduction, nano-TiO2 particles are always selectively localized at the phase interface between PLLA and PU, leading to a significant improvement in notched Izod impact toughness. The moderately weakened interfacial adhesion induced by the interfacially-localized nano-TiO2 particles is believed to be the main reason for the largely enhanced impact toughness

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 95%

Selective localization of titanium dioxide nanoparticles at the interface and its effect on the impact toughness of poly(L-lactide)/poly(ether)urethane blends

Xiu¹,

Bai²,

Huang³

et al. 2013

“…There are several studies on the preparation and the properties of nanocomposites based on polymer blends in the presence or not of compatibilizers [1][2][3][4][5][6][7][8][9]. Blends of polyamides with polyolefins and polyesters are particularly interesting and attractive from an industrial point of view.…”

Section: Introductionmentioning

confidence: 99%

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Scaffaro¹,

Botta²,

Mistretta³

et al. 2013

Abstract. In this work, we studied the effect of the method of preparation and of reprocessing on the morphology and, consequently, on the physical properties of polyamide 6 (PA6)/ high density polyethylene (HDPE)-clay nanocomposite blends in the presence of different compatibilizers. In particular, the nanocomposites were obtained by melt mixing using a corotating twin screw extruder (E1). The blends thus obtained were re-extruded (E2) under the same operating conditions. Moreover, blends with the same final composition were produced using a masterbatch of the compatibilizer with the clay prepared in a separated stage in a batch mixer (MB). All the materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD) analyses. In addition, the rheological behaviour and the, tensile and impact, properties were evaluated. The XRD and TEM analysis showed that re-extrusion slightly improves the morphology of the nanocomposites. A further improvement of the morphology, in terms of lower clay dimension and better dispersion, was observed in the MB blends. The results of the mechanical tests showed that reprocessing (E2) induced an increase of all the properties for all the three systems. A further general increase of the mechanical properties was showed by the MB blends.

“…They revealed that this blend is immiscible but only one T g was observed due to the close proximity of individual T g 's of both PBS and PBAT. Other reports have shown that OMMT can act as compatibilizer for immiscible polymer blends [9][10][11][12][13][14][15] which exhibit remarkable improvement in their properties compared to the pristine polymer or the conventional composite [16,17]. The interlayer cations between the silicate layers such as Na + are exchanged with organic cations to increase the organonophilicity of the clay layers.…”

Section: Introductionmentioning

confidence: 99%

Effect of organo-modified montmorillonite on poly(butylene succinate)/poly(butylene adipate-co-terephthalate) nanocomposites

Chieng¹,

Ibrahim

Yunus³

2010

Abstract. The composite material based on poly(butylene succinate) (PBS), poly(butylene adipate-co-terephthalate) (PBAT) and organo-modified montmorillonite (OMMT) were prepared by melt blending technique and characterized. Sodium montmorillonite (Na-MMT) was successfully modified by octadecylammonium (ODA) and dimethyldioctadecylammonium (DDOA) salts to become OMMT through cation exchange technique which is shown by the increase of basal spacing of clay by XRD. The addition of the OMMT to the PBS/PBAT blends produced nanocomposites which is proved by XRD and TEM. Tensile tests showed increase in tensile strength and modulus which is attributed to the existence of strong interactions between PBS/PBAT and clay, particularly with OMMT. Highest tensile strength of nanocomposite was observed at 1 wt% of OMMT incorporated. TGA study showed that the thermal stability of the blend increased after the addition of clays. SEM micrographs of the fracture surfaces show that the morphology of the blend becomes homogeneous and smoother with presence of OMMT.