Effect of Poly(Styrene‐Ethylene‐Butylene‐Styrene) Block Copolymer on Thermomechanical Properties and Morphology of Polypropylene/Poly(Styrene‐Ethylene‐Butylene‐Styrene)/Polycarbonate Ternary Blends

Abstract

Ternary polymer blends based on polypropylene (PP)/poly(styrene‐ethylene‐butylene‐styrene) (SEBS)/polycarbonate (PC) compatibilized through maleic anhydride‐grafted SEBS were prepared using a twin‐screw extruder. Four different compositions in which the weight ratio of SEBS constituent was varied from 5% up to 30% were formulated in order to assess the relation between morphology and mechanical properties and SEBS/SEBS‐g‐MA weight ratio was set to be 1. Samples were characterized using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and mechanical properties measurements. Microscopic observation confirmed the formation of core‐shell droplets dispersed in the PP matrix in which the rubbery phase encapsulated PC droplets. Individual fibril‐like PC rods were also observed beside the encapsulations. Accordingly, impact resistance progressively improved (28.57‐fold at 30 wt% of SEBS) compared to neat PP while only 6.8% decrease was detected in the yield strength of this sample. SEM micrographs also showed that the population and size of the individual PC particles are higher in the samples containing 5 and 10 wt% of SEBS compared to those containing 20 and 30 wt%, which endow the former with higher chance of heterogeneous nucleation and correspondingly higher crystallization temperature confirmed by DSC results. Introduction of SEBS rubber phase intensified the elastic behavior of the blends supported by DMTA thermograms.

Evaluation of the SEBS copolymer in the compatibility of PP/ABS blends through mechanical, thermal, thermomechanical properties, and morphology

“…As indicated in Figure 2(B), some voids were also observed. At the same time, the PP/ABS/SEBS (7.5% and 10%) blends presented an irregular fracture aspect, promoting an inefficient toughening 45 . The morphology of the compositions containing 7.5% and 10% SEBS (Figure 2(C, D) exhibited a layered (delaminated) and irregular PP matrix structure, respectively.…”

Fabrication and Characterization of Aluminum Nanoparticle-Reinforced Composites

“…To confirm the microstructure morphology of the nanocomposite, a scanning electron microscope (SEM, S-4700, Hitach, Tokyo, Japan) was used to observe the dispersion of nanoparticles in the sample. The thermal properties of the samples were measured using differential scanning calorimetry (DSC, Q2000 system, TA instrument, New Castle, DE, USA) [21][22][23][24][25][26]. Stopping and range of ions in matter (SRIM) simulation was performed to estimate the thickness of the ion beam penetration into the composite, and ion beam injection was performed at different flow rates/energies using two ion species (N and Cr) at room temperature.…”

Effect of Entanglement Density on Mechanical Properties and the Deformation Mechanism of Rubber‐Modified PPO/PS Blends

“…[1,2] Many researchers have effectively DOI: 10.1002/mame.202200325 improved the toughening effect of rubber by exploring the toughening mechanism of rubber. [3][4][5] Under loading, rubber microparticles concentrate stress and cavitate, which facilitates the crazing or shear yielding of polymer matrices around the rubber particles. [6][7][8][9][10][11] Researchers have explored the toughening mechanism of rubber to obtain a method to control the toughening effect of rubber and achieve the balance of stiffness and toughness in materials.…”