Flow‐induced particle orientation and rheological properties of suspensions of organoclays in thermoplastic resins

Rajabian, Mahmoud; Naderi, Ghasem; Carreau, Pierre J.; Dubois, Charles

doi:10.1002/polb.22188

Cited by 2 publications

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“…Natale and et al found the interaction parameter as q = 0.1, experimentally, for carbon nanotube suspensions . Rajabian and et al introduced the interaction parameter as B and calculated to be equal 0.1 for suspensions of nanoclays in thermoplastic resins .…”

Section: Nanofiber Contributionmentioning

confidence: 99%

Study the effects of nanofiber on the polymer chain orientation using molecular dynamic in the circular duct flow

Kanvisi

2018

Polymer Engineering & Sci

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In this article, the effects of nanofiber on the polymer chain orientation are studied using molecular dynamic techniques in the circular duct flow. The conformational tensor models, which have root in the molecular dynamic, applied to simulate the polymer chain orientation in suspension of nanofibers. The effects of nanofiber aspect ratio are also investigated on the polymer chain orientation. The results show that the polymer chains are less oriented along the flow direction for more nanofiber concentration and consequently, the extensibility of the polymer chains decrease. In fact, the nanofibers prevent to stretch of polymer chains along the flow direction. Moreover, the results indicate that as increasing the aspect ratio of nanofibers, the c zz components decrease but c rr , c hh , and c zr components increase. It reveals that the polymer chains are less oriented along the flow direction for higher aspect ratio of nanofibers, and consequently, the length of polymer chains is reduced. POLYM. ENG. SCI., 00:000-000, FIG. 5. Effect of nanofiber aspect ratio on the mean square chain extension; nanofiber aspect ratio is (-) 1, (ÁÁÁ) 6, (--) 10, (--) 15.

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Section: Nanofiber Contributionmentioning

confidence: 99%

Study the effects of nanofiber on the polymer chain orientation using molecular dynamic in the circular duct flow

Kanvisi

2018

Polymer Engineering & Sci

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“…[17][18][19] NET laws provide the means to impose restrictions to the model parameters. Up to date, several micro-structured systems, such as liquid crystals, [20][21][22] polymer melts and solutions, [17][18][19][22][23][24] immiscible complex fluids, [17][18][19][25][26][27] polymer nanocomposites, [28][29][30][31][32][33] drilling fluids, 34 blood, 35 ionomers, 36 and micellar systems, 37 have been addressed through NET, a fact that attests to its usefulness and applicability. To the best of our knowledge, only the model proposed by Beris et al 38 for concentrated star polymer suspensions, a system exhibiting a yield stress, was derived via the use of NET principles.…”

Section: Introductionmentioning

confidence: 99%

A nonequilibrium thermodynamics perspective of thixotropy

Stephanou

Georgiou

2018

The Journal of Chemical Physics

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We propose a new description of elasto-viscoplastic fluids by relating the notion of thixotropy directly to internal viscoelasticity and network structures through a general, thermodynamically consistent, approach. By means of non-equilibrium thermodynamics, a thermodynamically-admissible elasto-viscoplastic model is derived which introduces self-consistently and effortlessly thixotropic effects and reproduces at both low and high shear rates experimental data usually fitted with empirical constitutive equations, such as the Bingham and Herschel-Bulkley models. The predictions of the new model are in very good agreement with available steadystate shear rheological data for soft colloidal pastes and blood, i.e. systems exhibiting a yield stress, and with time-dependent rheological data for blood, i.e. during a triangular time-dependent change in shear rate, exhibiting a hysteresis. The proposed approach is expected to provide the means to improve our understanding of thixotropic fluids.

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Flow‐induced particle orientation and rheological properties of suspensions of organoclays in thermoplastic resins

Abstract: FIGURE 6 TEM image of organoclay/PP nanocomposite, / m ¼ 7 wt %.FIGURE 5 X-ray diffraction patterns of (a) Cloisite 15A, (b) master batch of Cloisite 15A/PPMA, and (c) PP nanocomposite, / m ¼ 7 wt %.

Cited by 2 publications

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Study the effects of nanofiber on the polymer chain orientation using molecular dynamic in the circular duct flow

Study the effects of nanofiber on the polymer chain orientation using molecular dynamic in the circular duct flow

A nonequilibrium thermodynamics perspective of thixotropy

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