Confined crystallization phenomena in immiscible polymer blends with dispersed micro- and nanometer sized PA6 droplets, part 2: reactively compatibilized PS/PA6 and (PPE/PS)/PA6 blends

Crystalline and Spherulitic Morphology of Polymers Crystallized in Confined Systems

“…Depending on the interactions and miscibility of polymer components, polymer blends can be classified as miscible and immiscible systems. Although the confined crystallization of polymers has been observed in a few immiscible blends [69][70][71][72][73][74], it is less common because the phase domains of polymer components are usually large and range in the scales of several to several tens of micrometers. However, in the case of miscible polymer blends with one or two crystalline components, the crystallization kinetics and crystalline morphology of crystalline component will be severally influenced by the other component; this is more obvious for the crystalline/crystalline polymer blend systems.…”

Influence of Carbon‐Black Nanoparticles on Poly(butylene terephthalate) Fractionated Crystallization in Bicomponent Poly(butylene terephthalate)/Poly[ethylene‐co‐(ethyl acrylate)] Blends

“…The current interpretation of this phenomenon is that for a number of heterogeneous nuclei much lower than the number of dispersed droplets of the minor component, only homogeneous nucleation can take place and this at a larger super-cooling. [1][2][3][4][5][6][7] Nevertheless, some parameters were found to be influential such as particle size and diameter distribution, [7][8][9][10][11][12][13] processing conditions and dispersion Full Paper Summary: The crystallization of the PBT minor phase in an EEA continuous matrix has been studied by DSC and SEM. When PBT is the minor phase, PBT crystallizes at a lower temperature, as expected, near T c,f1 ¼ 105 8C.…”

“…state, [2,3,9,14] additives such as compatibilizers [8,10,12,15,16] or homogeneous or heterogeneous nucleating agents. [3,6,9,10,12,13,17,18] Moreover, in some cases, the fractionated crystallization was attributed to polymorphism. [19] The fractionated crystallization is characterized by a more or less important DT c ¼ T c,n À T c,f (where T c,n is the classic non isothermal crystallization temperature, and T c,f the fractionated crystallization temperature) depending on the nature and content of the constituents (see Table 1).…”

Confined crystallization phenomena in immiscible polymer blends with dispersed micro-and nanometer sized PA6 droplets part 4: polymorphous structure and (meta)-stability of PA6 crystals formed in different temperature regions

“…If a semicrystalline polymer is dispersed into confining droplets, strong effects on its crystallization behavior have been observed [1][2][3][4][5][6][7][8][9][10][11][12]. As a result of the lack of active heterogeneities in the isolated droplets, several crystallization events take place at different lowered temperatures, also referred to as fractionated crystallization [5].…”

“…As a result of the lack of active heterogeneities in the isolated droplets, several crystallization events take place at different lowered temperatures, also referred to as fractionated crystallization [5]. In two recent previous papers [11,12], these phenomena for PA6 droplets dispersed inside different amorphous polymer matrices were investigated. Via reactive compatibilization of the blends, the PA6 droplet size was strongly reduced, resulting in crystallization around 85 8C, more than 100 8C lower than the normal bulk crystallization temperature.…”