Compatibility Studies in Binary Blends of PA6 and ULDPE-graft-DEM

The Influence of Blend Morphology (Co‐Continuous or Sub‐Micrometer Droplets Dispersions) on the Nucleation and Crystallization Kinetics of Double Crystalline Polyethylene/Polyamide Blends Prepared by Reactive Extrusion

“…Several researchers have since employed this technique to that end (see refs. [16,17,20,22,33,35] ).…”

“…In this case, the number of droplets surely exceeds by several orders of magnitude the number of heterogeneous nuclei in bulk cPA 6 . A simple calculation [33] based on the particle size and the TEM micrographs shown in Figure 1 indicate an approximate particle density of the order of 10 14 -10 15 droplets Á cm À3 , while the number density of heterogeneities in commercial nylons is on the order of 10 11 -10 12 heterogeneities Á cm À3 . [44] This means that the majority of the droplets will be free of any heterogeneities (since not all heterogeneities are active and some are wasted during extrusion processes by migrating to the matrix) and can only nucleate homogeneously or superficially, this is the reason why we observe in both blends (MA and MB) only one low temperature exotherm in which the entire cPA 6 phase is undergoing crystallization.…”

“…Sánchez et al [33] studied for the first time the fractionated crystallization of Nylon 6 droplets within an immiscible but compatible matrix of ultra LDPE grafted with diethylmaleate (ULDPE-g-DEM). They produce a polydisperse droplet dispersion with sizes that varied from 0.6 to 3 mm depending on composition and compatibilization degree.…”

“…Also, since both blend components can crystallize we can expect an influence on the nucleation and overall crystallization kinetics of the blend depending on which component crystallizes first upon cooling. As far as the blend prepared here, even though similar materials have been prepared, [33][34][35] no systematic study of isothermal crystallization kinetics as a function of blend morphology has been performed as far as the authors are aware.…”

Crystallization, Morphology, and Enzymatic Degradation of Polyhydroxybutyrate/Polycaprolactone (PHB/PCL) Blends

“…This is a typical ''fractionated crystallization'' process of the PCL component, [7][8][9]29,[42][43][44][45][46][47][48] and indicates that the heterogeneities donated by PHB are not active enough to induce PCL nucleation. The fractionated crystallization occurs as a consequence of the PCL dispersion into isolated droplets, whose number is higher than the quantity of the available active heterogeneities usually present in the homopolymer in the bulk; therefore, the crystallization of different groups of droplets can take place at specific supercoolings that are independent from each other.…”