Rheology of polycarbonate/poly(butylene terephthalate) blends containing a core‐shell modifier and high‐molecular‐weight acrylic polymers: Extrusion blow‐moldable resins

Memon, Nazir A.

doi:10.1002/app.1994.070540808

Cited by 13 publications

(9 citation statements)

References 7 publications

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“…This is attributed to the improved alignment of the PP chains and formation of a thin "dead-layer" of PP on the WF-N fiber surface at a high shear rate. 25,26 It appears that the relative movement of WF-N fiber and matrix occurred at the interface between the "dead-layer" of PP and matrix at a high shear rate. The "dead-layer" acted as a lubricant and reduced the friction and the complex viscosity of the WF-N/PP composite.…”

Section: Rheology and Microscopymentioning

confidence: 97%

Effect of fiber pretreatment condition on the interfacial strength and mechanical properties of wood fiber/PP composites

Chan

et al. 2000

J. Appl. Polym. Sci.

191

145

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ABSTRACT:The effect of fiber surface pretreatment on the interfacial strength and mechanical properties of wood fiber/polypropylene (WF/PP) composites are investigated. The results demonstrate that fiber surface conditions significantly influence the fiber-matrix interfacial bond, which, in turn, determines the mechanical properties of the composites. The WF/PP composite containing fibers pretreated with an acid-silane aqueous solution exhibits the highest tensile properties among the materials studied. This observation is a direct result of the strong interfacial bond caused by the acid/ water condition used in the fiber pretreatment. Evidence from coupling chemistry, rheological and electron microscopic studies support the above conclusion. When SEBSg-MA copolymer is used, a synergistic toughening effect between the wood fiber and the copolymer is observed. The V-notch Charpy impact strength of the WF/PP/SEBS-g-MA composite is substantially higher than that of the WF/PP composite. The synergistic toughening mechanisms are discussed with respect to the interfacial bond strength, fiber-matrix debonding, and matrix plastic deformation.

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Section: Rheology and Microscopymentioning

confidence: 97%

Effect of fiber pretreatment condition on the interfacial strength and mechanical properties of wood fiber/PP composites

Chan

et al. 2000

J. Appl. Polym. Sci.

191

145

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“…The interconnectivity can be attributed to high interactions at the particle/matrix interface resulting in larger "effective volumes" of the dispersed particles. 18,19 For the same particle sizes interconnectivity of the particles results at lower modifier levels if the interfacial region is broader.…”

Section: Background Theorymentioning

confidence: 98%

“…The three-dimensional network and interconnectivity are, therefore, a consequence of larger effective volumes of the particles. 17,18 These particles with associated matrix chains would have higher elastic response and exhibit a plateau at low frequencies. The concept of "mechanically active volume" resulting from the association of the matrix with the dispersed phase has previously been used to explain the rheological properties of elastomer modified blends.…”

Section: The Application Of the Emulsion/suspension Modelsmentioning

confidence: 99%

Interface, morphology, and the rheological properties of polymethylmethacrylate/impact modifier blends

Memon¹,

Müller

1998

J. Polym. Sci. B Polym. Phys.

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Impact modifiers with grafted PMMA shell are used to modify polymethylmethacrylate matrix. The composition of the shell is chosen to enhance the interactions at the modifier/matrix interface and to obtain good dispersion of the impact modifier in order to optimize impact strength of the blend. The degree of interactions at the interface is characterized by the interfacial region where the chains of the matrix mix with those of the shell of the modifier. The deviation of the measured viscoelastic behavior of these blends from that predicted by the emulsion models has been attributed to the formation of the network structure due to the association of matrix chains with the shell of the modifier. It is expected that the network structure will decrease with increasing frequency and, as such, the effective volume of the particle is frequency dependent. This study uses the emulsion models to estimate the larger effective volume of the particle and, therefore, the extent of interaction at the interface. In the blends of this study it can be shown that at low modifier levels the solvent swelling of the modifier shell results in stronger interactions with the matrix; this effect is negated by the aggregation of particles at higher modifier loadings. The interaction of core modifier with the PMMA matrix seems to be similar to that of the core‐shell modifier. This would not be expected from the calculated interfacial thickness of approximately 4 nm. It is, therefore, proposed that during melt‐processing the core modifier surface was altered due to grafting of the matrix PMMA chains during melt‐blending to (BA/St) copolymer of the core modifier thus reducing the interfacial tension. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. B Polym. Phys. 36: 2623–2634, 1998

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“…The preference of the impact modifier for interaction with the PC rather than with the PBT, reported by several researchers [153][154][155][156][157][158] and in the light of the results presented in Fig. 4, is interpreted in terms of the preference of the PBT to interact intramolecularly and intermolecularly with PBT molecules and of the Lewis base-base repulsion (predominant repulsion effect) between the PBT and the impact modifier.…”

mentioning

confidence: 60%

Analysis of interactions in multicomponent polymeric systems: The key-role of inverse gas chromatography

Santos

Guthrie

2005

Materials Science and Engineering: R: Reports

107

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The properties of a polymeric system are a consequence of the interactions that occur between the various components of these complex systems. These components may vary significantly in terms of chemical nature (e.g. organic/inorganic), physical properties (e.g. particle size, surface area, molecular weight), structural characteristics and proportion in the formulations composition. This review paper addresses the major approaches in use regarding the analysis of the interactions that occur between the polymeric system components and the use of such approaches in the interpretation of the chemical, physical and thermodynamic properties of these systems. Special attention is given to the technique of inverse gas chromatography.A case study is presented, where use was made of inverse gas chromatography to characterize thermodynamically the surface of the major components of pigmented PC/PBT blends. The concept of Lewis acidity/basicity was used in the interpretation of the intermolecular interactions nature and potential in these blends, as encountered in phase separation and phase preferences phenomena and as expressed in the morphology, the physical and the mechanical properties of these commercially important composites. #

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Rheology of polycarbonate/poly(butylene terephthalate) blends containing a core‐shell modifier and high‐molecular‐weight acrylic polymers: Extrusion blow‐moldable resins

Cited by 13 publications

References 7 publications

Effect of fiber pretreatment condition on the interfacial strength and mechanical properties of wood fiber/PP composites

Effect of fiber pretreatment condition on the interfacial strength and mechanical properties of wood fiber/PP composites

Interface, morphology, and the rheological properties of polymethylmethacrylate/impact modifier blends

Analysis of interactions in multicomponent polymeric systems: The key-role of inverse gas chromatography

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