On the Correlation of Rheology and Morphology of Bimodal Polypropylene Reactor Blends Synthesized by Homogeneous Binary Metallocene/Metallocene Catalysts

Influence of Different Types of Peroxides on the Long-Chain Branching of PP via Reactive Extrusion

“…Morshedian et al [51] reported that as the MFR increases, the crossover point shifts to higher frequencies. In the literature, it is well established that changes in molecular mass MW and molecular mass distribution (MMD) of different polymers can be detected by the position change of the crossover point [51][52][53][54]. This means that there is a critical frequency ωC and a critical modulus GC for each For the modification at 180 • C, the curves of all modified PP samples are located below the curve of the virgin PP.…”

“…In the literature, it is well established that changes in molecular mass M W and molecular mass distribution (MMD) of different polymers can be detected by the position change of the crossover point [51][52][53][54]. This means that there is a critical frequency ω C and a critical modulus G C for each crossover point.…”

Mechanochemical tuning of molecular weight distribution of styrene homopolymers as postpolymerization modification in solvent‐free solid‐state

“…[ 6 ] In this regard, bimodality has shown to be the most suitable characteristic of MWDs to control rheological, mechanical and processability properties simultaneously, which is attributed to the fact that the component with lower molecular weights influences in the processability and the component with higher molecular weight regulates the mechanical properties. [ 1–3,7–9 ] Methods to control MWD are generally based on the manipulation of specific variables during the polymer synthesis or performed using melt or solution blending of different MWDs. [ 8–14 ]…”

“…The molecular weight distribution (MWD) of a polymer has been shown to have great influence on its physical, mechanical, and rheological properties. [1][2][3] Moreover, processability and bulk adhesion is also influenced by the MWD. [4,5] Thus, the impact of the MWD in different polymer properties shows clearly that tuning the entire MWD offers the possibility to modify the polymer properties without the need to change its chemical structure.…”

“…[6] In this regard, bimodality has shown to be the most suitable characteristic of MWDs to control rheological, mechanical and processability properties simultaneously, which is attributed to the fact that the component with lower molecular weights influences in the processability and the component with higher molecular weight regulates the mechanical properties. [1][2][3][7][8][9] Methods to control MWD are generally based on the manipulation of specific variables during the polymer synthesis or performed using melt or solution blending of different MWDs. [8][9][10][11][12][13][14] In the literature, we have found reports regarding the feasibility of tuning MWDs using mechanochemical degradation with different techniques; yet, these works were focused on the interpretation of mechanochemical degradation, the establishment of kinetic degradation rate or finding the limiting molecular weight.…”