Morphological and rheological study of polypropylene blends with a commercial modifier based on hydrogenated oligo (cyclopentadiene)

Ivanov, I.N.; Muke, S.; Kao, Nhol; Bhattacharya, S. N.

doi:10.1016/s0032-3861(01)00480-3

Cited by 14 publications

(11 citation statements)

References 6 publications

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“…It also indicates the transition from liquid‐like behavior to pseudo solid‐like behavior of the polymer melt. In PSG250, the curve is almost a straight line which indicates that maximum filler–filler interaction has occurred in this composition .…”

Section: Resultsmentioning

confidence: 80%

Dielectric, electrical, and rheological characterization of graphene-filled polystyrene nanocomposites

et al. 2013

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A series of nanographene filled polystyrene (GPS) nanocomposites was prepared by in situ polymerization of styrene in the laboratory. The concentration of graphene was changed in the step of 0.25 wt% and a total of eight composites (including control) were prepared to obtain a threshold concentration of graphene. These composites, prepared by in situ polymerization followed by compression moulding, were characterized for their structural (using XRD), morphological (SEM), thermal (DSC, TGA, DTGA), dielectric behavior (ɛ', ɛ''') and DC conductivity. It was observed that the thermal stability as well as electrical and rheological properties of graphene‐polystyrene nanocomposites significantly improved due to the homogeneous dispersion, intercalation and exfoliation of the graphene layers in the Polystyrene matrix. It was also observed that at room temperature dielectric constant (ε′) decreased with increasing concentration of graphene and reached a minimum at a certain filler concentration of 0.25 wt% (PSG025) when frequency is kept constant. Rheological study showed an improvement in the storage modulus (G′) with incorporation of graphene as nanofiller. Loss modulus (G′) and complex viscosity (η*) also increased with increasing graphene weight percentage. Relaxation time also increased at high graphene loading because of the pseudo‐solid like behavior of polymer melt. POLYM. COMPOS., 34:2082–2093, 2013. © 2013 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 80%

Dielectric, electrical, and rheological characterization of graphene-filled polystyrene nanocomposites

et al. 2013

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“…The differences in the viscoelastic behavior as a function of temperature are better observed by using the so-called Cole-Cole plots (Friedrich and Braun 1992;Ivanov et al 2001). In fact, analogous to Cole-Cole plots used in dielectric spectroscopy (Cole and Cole 1941;Havriliak 1997), the real and imaginary components of viscoelastic properties are plotted against each other in such a representation.…”

Section: Temperature Effectmentioning

confidence: 99%

Rheological properties and percolation in suspensions of multiwalled carbon nanotubes in polycarbonate

et al. 2009

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Rheological properties and percolation in suspensions ofAbstract This paper is concerned with several issues related to the rheological behavior of polycarbonate/ multiwalled carbon nanotube nanocomposites. The composites were prepared by diluting a masterbatch of 15 wt.% nanotubes using melt-mixing method, and the dispersion was analyzed by SEM, TEM, and AFM techniques. To understand the percolated structure, the nanocomposites were characterized via a set of rheological, electrical, and thermal conductivity measurements. The rheological measurements revealed that the structure and properties were temperature dependent; the percolation threshold was significantly lower at higher temperature suggesting stronger nanotube interactions. The nanotube networks were also sensitive to the steady shear deformation particularly at high temperature. Following preshearing, the elastic modulus decreased markedly suggesting that the nanotubes became more rigid. These results were analyzed using simple models for suspensions of rod-like particles. Finally, the rheological, electrical, and thermal conductivity percolation thresholds were compared. As expected, the rheological threshold was smaller than the thermal and electrical threshold.

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“…To our knowledge, so far no data have been published on such types of polypropylene (PP) blends. The morphological and rheological study 12 of PP blends with hydrogenated oligo(cyclopentadiene), which are used in the packaging industry, 13,14 has shown that the components are miscible up to 30% of the latter. In the first step of our studies, we have selected the system PP/ COC with regard to our previous articles, [15][16][17][18][19][20] dealing with blends of PP.…”

Section: Introductionmentioning

confidence: 99%

Phase morphology of PP/COC blends

Šlouf

Kolařı́k

Fambri

2003

J of Applied Polymer Sci

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Phase morphology of polymer blends PP/ COC, where PP is polypropylene and COC is a copolymer of ethene and norbornene, was characterized by means of scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM). PP/COC blends were prepared by injection molding and their morphology was studied for six different compositions (90/10, 80/20, 70/30, 60/ 40, 50/50, and 25/75 wt %). The intention was to improve PP properties by forming COC cocontinuous phase, which should impart to the PP matrix higher stiffness, yield stress, and barrier properties. Surprisingly enough, all studied blends were found to have fibrillar morphology. In the 90/10, 80/20, and 70/30 blends, the PP matrix contained fibers of COC, whose average diameter increased with increasing COC fraction. In the 60/40 blend, the COC component formed in the PP matrix both fibers and larger elongated entities with PP fibers inside. The 50/50 blend was formed by COC cocontinuous phase with PP fibers and PP cocontinuous phase with COC fibers. In the 25/75 blend, PP fibers were embedded in the COC matrix. In all blends, the fibers had an aspect ratio at least 20, were oriented in the injection direction, and acted as a reinforcing component, which was proven by stress-strain and creep measurements. According to the available literature, the fibrous morphology formed spontaneously in PP/COC is not common in polymer blends.

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Morphological and rheological study of polypropylene blends with a commercial modifier based on hydrogenated oligo (cyclopentadiene)

Cited by 14 publications

References 6 publications

Dielectric, electrical, and rheological characterization of graphene-filled polystyrene nanocomposites

Dielectric, electrical, and rheological characterization of graphene-filled polystyrene nanocomposites

Rheological properties and percolation in suspensions of multiwalled carbon nanotubes in polycarbonate

Phase morphology of PP/COC blends

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