Morphology predictions for ternary polymer blends undergoing spinodal decomposition

Nauman, E. Bruce; He, David Qiwei

doi:10.1016/0032-3861(94)90757-9

Cited by 68 publications

(84 citation statements)

References 10 publications

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“…where 11 ϭ Ϫm 1 ϩ ͑m ϩ 1͒ 12 (16) 22 ϭ Ϫm 12 ϩ ͑m ϩ 1͒ 2 (17) Equations (13)- (17) describe phase separation by spinodal decomposition in a ternary polymer/ solvent/nonsolvent system where all compositions in the two-phase system are assumed to lie along the tie-line given by eq. (11).…”

Section: Model Equationsmentioning

confidence: 99%

Kinetics of thermally induced phase separation in ternary polymer solutions. I. Modeling of phase separation dynamics

Barton¹,

McHugh²

1999

J. Polym. Sci. B Polym. Phys.

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Section: Model Equationsmentioning

confidence: 99%

Kinetics of thermally induced phase separation in ternary polymer solutions. I. Modeling of phase separation dynamics

Barton¹,

McHugh²

1999

J. Polym. Sci. B Polym. Phys.

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“…Thus, the diblock is localized at the PS-PB homopolymer interface. 4,[27][28][29] The blend was dried by further devolatilization and ground to a powder. The final solvent content was 600 -900 PPM.…”

Section: Blend Productionmentioning

confidence: 99%

The effect of diblocks and ripening on the Izod impact of bulk PS/PB blends

Mathur

Nauman

1999

J. Appl. Polym. Sci.

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Bulk blends were used to study the effectiveness of various PS-PB diblock copolymers in improving the impact strength of PS/PB blends. The blends were produced by compositional quenching, and further ripened to control particle size and the diblock concentration at the homopolymer interface. It was found that an optimal molecular weight of diblock copolymer exists for the maximum notched Izod. Low molecular weight diblocks provided insufficient adhesion due to lack of entanglements, and high molecular weight diblocks provided insufficient interfacial concentration due to stearic crowding. The maximum notched Izod, for 23% rubber phase volume, was achieved with 1-particles, a copolymer surface density of 0.17 chains/nm 2 , some crosslinking, and a medium molecular weight, tapered diblock, M w ϭ 154,000, having a 30% PS content. The combination of high impact strength, 6.2 ft.-lbf./in., and high modulus, 2.2 GPa, significantly exceeds that of commercially available super highimpact polystyrene.

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“…One possible approach to mathematical modeling of HIPS morphology evolution is based on Cahn-Hilliard model adopted by Nauman and coworkers [6][7][8] and applied to spatially 2D formation of hetero-phase polymer morphologies. Basic assumptions of the Cahn-Hilliard model are described below in the text.…”

Section: Introductionmentioning

confidence: 99%

Modelling of the High‐Impact Polystyrene Morphogenesis

Vonka

Seda

Košek

2011

Macromolecular Symposia

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Summary: High-impact polystyrene (HIPS) is a hetero-phase polymer with the so-called salami morphology. Salami morphology is formed by a continuous PS phase containing micron-sized PB domains. PB domains contain submicron-sized irregular PS occlusions. In our modeling work we addressed several weak points of Cahn-Hilliard model of HIPS salami morphology evolution. The weakest point of Cahn-Hilliard model is the inherently present Ostwald ripening destabilizing or competing with graft-stabilized domains. Two mechanism of formation of HIPS morphology are supported by the model: (i) encapsulation of graft-stabilized PS-rich domains in PB particles, and (ii) polymerization of styrene dissolved in PB-rich phase and subsequent phase separation leading to PS occlusions in PB domains.

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Morphology predictions for ternary polymer blends undergoing spinodal decomposition

Cited by 68 publications

References 10 publications

Kinetics of thermally induced phase separation in ternary polymer solutions. I. Modeling of phase separation dynamics

Kinetics of thermally induced phase separation in ternary polymer solutions. I. Modeling of phase separation dynamics

The effect of diblocks and ripening on the Izod impact of bulk PS/PB blends

Modelling of the High‐Impact Polystyrene Morphogenesis

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