Study on morphology evolution and fractal character of the miscible blend between isotactic polypropylene and copolymer of ethylene and propylene

Minor‐phase particles evolution in a polyethylene/ethylene–propylene copolymer (80/20) blend across mixing: Breakup and coalescence

“…The SEM images obtained were subsequently segmented and subjected to digital analysis with our homemade processing software to elucidate the statistical size distribution of the minor‐phase particles. To analytically describe the resulting histograms and find the mean diameter of the dispersed‐phase particles, we used the model of reversible aggregation.…”

“…There has been a long‐standing interest from polymer researchers in understanding the formation and evolution of blend morphology, which has a significant influence on mechanical properties . During the past few decades, many research groups have carried out studies to gain a better understanding of the morphological development of polymer blends across mixing . It is well known that the morphology of polymer blends is mainly determined by two dynamic processes, breakup and coalescence.…”

“…This new class of polyethylene exhibits a molecular structure with a narrow molecular‐weight distribution and a uniformity of comonomer distribution and often offers unique mechanical and rheological properties. However, metallocene polyethylene (mPE) has poor processability because of its high viscosity, whereas metallocene ethylene–propylene (mEP) is an elastomer that can be widely used to toughen olefinic polymers, such as polypropylene and polyethylene …”

Cell structure-impact property relationship of polypropylene/thermoplastic elastomer blend foams

“…Over the past decade, polyolefin elastomers (POEs), synthesized by the metallocene catalysts, usually based on polyethylene, polypropylene or their copolymers, are used more often as the rubber phase in the blends. The blending properties of these elastomers with polypropylene have been previously reported in various studies regarding their high capability to increase impact strength [34][35][36]. It has been reported that the morphology of the propagation of rubber particles inside the polypropylene matrix, as well as the rubber particle size, play the most important role in increasing the impact strength of the compound, to such extent that POEs with proper distribution can enhance the impact strength of the compound by up to 13 times [37].…”

Mechanical and optical effects of elastomer interaction in polypropylene modification: Ethylene-propylene rubber, poly-(ethylene-co-octene) and styrene-butadiene elastomers

“…without co-crystallization across the phase boundary) are clearly causing light scattering and limiting transparency. Very good optical performance, but only limited low-temperature impact strength is reached with ethylene-propylene block copolymers of the Vistamaxx™ type by ExxonMobil due to the excellent compatibility to PP and its copolymers [19,20], and a density close to 900 kg/m 3 . The main reason for the comparably poor impact performance is the relatively high glass transition temperature of these polymers at ~-30°C.…”