Quantitative rheological evaluation of phase inversion in two-phase polymer blends with cocontinuous morphology

2002 ◽  
Vol 41 (1-2) ◽  
pp. 77-86 ◽  
Author(s):  
Sandra Steinmann ◽  
Wolfram Gronski ◽  
Christian Friedrich
Keyword(s):  
Polymer Blends ◽  
Phase Inversion ◽  
Two Phase

Influence of selective filling on rheological properties and phase inversion of two-phase polymer blends

Polymer ◽  
2002 ◽  
Vol 43 (16) ◽  
pp. 4467-4477 ◽  
Author(s):  
Sandra Steinmann ◽  
Wolfram Gronski ◽  
Christian Friedrich
Keyword(s):  
Polymer Blends ◽  
Rheological Properties ◽  
Phase Inversion ◽  
Two Phase

Phase Inversion in Two-Phase Liquid Systems

1992 ◽  
Vol 57 (7) ◽  
pp. 1419-1423
Author(s):  
Jindřich Weiss
Keyword(s):  
Interfacial Tension ◽  
Phase Inversion ◽  
Continuous Phase ◽  
Considerable Effect ◽  
Weak Dependence ◽  
Dispersed Phase ◽  
Two Phase ◽  
Liquid Systems ◽  
Phase Liquid

New data on critical holdups of dispersed phase were measured at which the phase inversion took place. The systems studied differed in the ratio of phase viscosities and interfacial tension. A weak dependence was found of critical holdups on the impeller revolutions and on the material contactor; on the contrary, a considerable effect of viscosity was found out as far as the viscosity of continuous phase exceeded that of dispersed phase.

Morphology Evolution in Immiscible Polymer Blends during Compounding

2006 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Melting Point ◽  
Polymer Blends ◽  
Rheological Properties ◽  
Morphology Evolution ◽  
Two Phase ◽  
Immiscible Polymers ◽  
Blend Morphology ◽  
Twin Screw ◽  
Buss Kneader ◽  
Batch Mixer

Polymer researchers have had a long-standing interest in understanding the evolution of blend morphology when two (or more) incompatible homopolymers or copolymers are melt blended in mixing equipment. In industry, melt blending is conducted using either an internal (batch) mixer (e.g., a Banbury mixer or a Brabender mixer) or a continuous mixer (e.g., a twin-screw extruder or a Buss kneader). There are many factors that control the evolution of blend morphology during compounding, the five primary ones being (1) blend composition, (2) rheological properties (e.g., viscosity ratio) of the constituent components, (3) mixing temperature, which in turn affects the rheological properties of the constituent components, (4) the duration of mixing in a batch mixer or residence time in a continuous mixer, and (5) rotor speed in a batch mixer or screw speed in a continuous mixer (i.e., local shear rate or shear stress). When two immiscible polymers are compounded in mixing equipment, two types of blend morphology are often observed: dispersed morphology and co-continuous morphology. Numerous investigators have reported on blend morphology of immiscible polymers, and there are too many papers to cite them all here. Some investigators (Han 1976, 1981; Han and Kim 1975; Han and Yu 1972; Nelson et al. 1977; van Oene 1978) examined blend morphology to explain the seemingly very complicated rheological behavior of two-phase polymer blends, and others (Favis and Therrien 1991; He et al. 1997; Ho et al. 1990; Miles and Zurek 1988; Scott and Macosko 1995; Shih 1995; Sundararaj et al. 1992, 1996) investigated blend morphology as affected by processing conditions. Today, it is fairly well understood from experimental studies under what conditions a dispersed morphology or a co-continuous morphology may be formed, and whether a co-continuous morphology is stable, giving rise to an equilibrium morphology, or whether it is an unstable intermediate morphology that eventually is transformed into a dispersed morphology (Lee and Han 1999a, 1999b, 2000). Let us consider the morphology evolution in an immiscible blend consisting of two semicrystalline polymers, A and B, in a compounding machine, and let us assume that the melting point (Tm,A) of polymer A is lower than the melting point (Tm,B) of polymer B.

scholarly journals Influence of the Phase Inversion on Mould-Shrinkage, Mechanical- and Burning Properties of Polymer Blend

2017 ◽  
Vol 885 ◽  
pp. 36-41 ◽  
Author(s):  
Károly Dobrovszky ◽  
Ferenc Ronkay
Keyword(s):  
Physical Properties ◽  
Polymer Blends ◽  
Tensile Properties ◽  
Polymer Blend ◽  
Phase Inversion ◽  
Viscosity Ratio ◽  
Screw Extruder ◽  
Binary Polymer ◽  
Mechanical And Physical Properties ◽  
Twin Screw

Blending polymers is an effective method to develop novel materials, tailoring the properties of the components. However, different morphology structures can be formed during the preparation, which could result in a wide diversity of mechanical and physical properties. The properties of polymer blends are most significantly influenced by the emerging range of phase inversion, which depends on the composition ratio and the viscosity ratio. In this paper various blends were prepared, utilizing polyethylene terephthalate (PET), polystyrene (PS) and two high density polyethylenes (HDPE), which differ in flowability. After preliminary homogenization by twin screw extruder, standard injection moulded specimen were prepared in order to present the effects of phase inversion on tensile properties, shrinkage and burning characteristics in binary polymer blends.

Rheological and morphological study of the phase inversion in reactive polymer blends

Polymer ◽  
1997 ◽  
Vol 38 (19) ◽  
pp. 4775-4783 ◽  
Author(s):  
A. Bouilloux ◽  
B. Ernst ◽  
A. Lobbrecht ◽  
R. Muller
Keyword(s):  
Polymer Blends ◽  
Morphological Study ◽  
Phase Inversion ◽  
Reactive Polymer
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