The influence of partial emulsification on coalescence suppression and interfacial tension reduction in PP/PET blends

Lepers, Jean‐Christophe; Favis, Basil D.; Lacroix, Christophe

doi:10.1002/(sici)1099-0488(19990501)37:9<939::aid-polb6>3.0.co;2-o

Cited by 54 publications

(44 citation statements)

References 43 publications

(32 reference statements)

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“…This can be explained through the differences of magnitude of coalescence that undergo both blends. As explained by Wallheinke et al [22] and De Sousa and Demarquette [14], coalescence depends essentially on: (a) the probability of two droplets to collide and (b) the rheological and thermodynamical ability of the blend to drain the film of matrix phase entrapped between two droplets of the dispersed phase until the critical thickness for coalescence to occur is reached [23]. When the probability of two droplets to collide is high and the drainage of the film is easy, coalescence can occur.…”

Section: Resultsmentioning

confidence: 99%

Effect of composition on the linear viscoelastic behavior and morphology of PMMA/PS and PMMA/PP blends

Calvão

Yee

Demarquette

2005

Polymer

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Section: Resultsmentioning

confidence: 99%

Effect of composition on the linear viscoelastic behavior and morphology of PMMA/PS and PMMA/PP blends

Calvão

Yee

Demarquette

2005

Polymer

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“…Above this critical concentration (C crit ), which represents the saturation of the interface by the modifier, the particle size attains a steady-state value (d equil ). 26 An overall decrease of about a fifth in d v value is observed. Such significant reduction is attributed to a decrease of the interfacial tension and the coalescence inhibition of the dispersed PA6 particles due to the formation of TPE-g-PA6 interfacial copolymer.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 90%

Crystallization Behaviors of Polypropylene/Polyamide-6 Blends Modified by a Maleated Thermoplastic Elastomer

Liu

Xie²,

Zhang

et al. 2006

Polym J

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ABSTRACT:In this paper, with the maleated thermoplastic elastomer (TPEg) as a compatibilizer of polypropylene (PP)/polyamide-6 (PA6) blends, the effects of interfacial compatibilization on the crystallization behaviors of the blends were investigated by differential scanning calorimetry (DSC). Compared with the binary blend, the addition of TPEg significantly affected the crystallization behaviors of the individual component in the blends, especially those of PA6. The presence of TPEg weakened the nucleating role of the PA6 on the PP matrix. The increasing concentration of the compatibilizer caused a decrease in crystallization temperature (T c ) and crystallization enthalpy (ÁH c ) associated with PA6. When TPEg amount was added up to 24 wt %, the crystallization of PA6 at its bulk T c was almost completely suppressed and the complete concurrent crystallization of PA6 and PP matrix took place. In the case of PP/PA6/TPEg blend containing 24 wt % TPEg, it was found that the disappearance of bulk PA6 crystallization peak was independent of the cooling rate and annealing time, but can be introduced by self-nucleation experiments. The above fractionated crystallization phenomenon was attributed to the reduction in PA6 particle size due to compatibilization role of added TPEg, which leads to the lack of the active heterogeneities. The crystalline morphologies under isothermal conditions were also observed by polarized optical microscopy (POM). [DOI 10.1295/polymj.38.21] KEY WORDS Polypropylene (PP) / Polyamide-6 / Crystallization / Compatibilization / Morphology / Compatibilization strongly affects the blend phase morphology and as such, it may also influence the crystallization behaviors of the blend. Both morphology and crystallization behaviors are closely related with the final properties of the blend, a profound understanding of the crystallization behavior and the resulting semicrystalline structure in polymer blends is necessary for effective manipulation and control of their properties from both scientific and industrial point of view. However, the general influence of a compatibilizer on the crystallization behavior of an immiscible polymer blend system is still far from being well understood, especially for crystalline polymer/crystalline polymer.

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“…[20][21][22] The size of the dispersed particles decreases for small amounts of compatibilizer and then levels off at higher concentrations, reaching an equilibrium value which corresponds to the saturation concentration of the compatibilizer at the interface. [23,24] The emulsification curves for PA6/LDPE blends compatibilized with LDPE-g-GMA at different grafting degrees are shown in Figure 3(a).…”

Section: Emulsification Curvesmentioning

confidence: 99%

Reactive Compatibilization of PA6/LDPE Blends with Glycidyl Methacrylate Functionalized Polyolefins

Qian

Chionna²,

Pracellà³

2005

Macro Chemistry & Physics

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Summary: Blends of polyamide‐6 (PA6) and low density polyethylene (LDPE) were compatibilized by melt mixing with various polyolefins functionalized with glycidyl methacrylate (GMA), i.e., GMA grafted LDPE (LDPE‐g‐GMA), GMA grafted styrene‐ethylene/butylene‐styrene block copolymer (SEBS‐g‐GMA) and ethylene‐co‐glycidyl methacrylate copolymer (E‐GMA). Blends with PA6/LDPE composition ratios of 25/75 and 75/25 wt.‐%/wt.‐% were prepared in a Brabender internal mixer and their properties were evaluated by SEM, rheological measurements and DSC. Morphological investigation by SEM showed a neat improvement of phase dispersion and interfacial adhesion in all compatibilized blends when compared to PA6/LDPE binary blends. The variation of the dispersed phase size was analyzed as a function of blend composition, compatibilizer concentration and GMA content. The emulsification curves of compatibilized blends showed that the equilibrium size of dispersed particles at the saturation concentration of copolymer was lower when PA6 was the major component. The finest dispersion of the LDPE phase (<0.25 μm) was observed in the presence of SEBS‐g‐GMA copolymer. LDPE‐g‐GMA and E‐GMA displayed a similar compatibilizing efficiency. In all cases, the blends with a polyamide matrix presented a marked rise in torque and melt viscosity with increasing compatibilizer content. These effects were accounted for by a reaction between the epoxide groups of LDPE‐g‐GMA and the carboxyl/amine end‐groups of PA6, leading to the formation of an interchain graft copolymer. The phase transition processes of PA6 in the blends were influenced by the compatibilizer content and the interfacial interactions between the polymer components, suggesting a different role for the compatibilizer at the PA6/LDPE interface.SEM micrograph of PA6/LDPE 25/75 blend compatibilized with 2.5 phr SEBS‐g‐GMA.magnified imageSEM micrograph of PA6/LDPE 25/75 blend compatibilized with 2.5 phr SEBS‐g‐GMA.

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The influence of partial emulsification on coalescence suppression and interfacial tension reduction in PP/PET blends

Cited by 54 publications

References 43 publications

Effect of composition on the linear viscoelastic behavior and morphology of PMMA/PS and PMMA/PP blends

Effect of composition on the linear viscoelastic behavior and morphology of PMMA/PS and PMMA/PP blends

Crystallization Behaviors of Polypropylene/Polyamide-6 Blends Modified by a Maleated Thermoplastic Elastomer

Reactive Compatibilization of PA6/LDPE Blends with Glycidyl Methacrylate Functionalized Polyolefins

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