Melt elasticity and flow activation energy of nylon 6/polystyrene blends

Nair, Sobha V.; Oommen, Zachariah; Thomas, Sabu

doi:10.1016/s0167-577x(02)00815-7

Cited by 19 publications

(11 citation statements)

References 7 publications

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“…8 kJ/mol) by Silva et al (1998). It has been found that low activation energy of flow indicates few inter-and intra-interactions between polysaccharide chains in the concentration range investigated and that the higher the value of E F , the less sensitive is the polymer to temperature change (Shaikh et al, 2011;Nair et al, 2002). From the results of the present study, it can be deduced that there is existence of few inter-and intra-molecular interactions in AL gum.…”

Section: Thermodynamic Parameter Of Viscous Flowsupporting

confidence: 48%

Physicochemical studies and rheological modelling of Albizia lebbeck (AL) gum exudates

Eddy

Udofia

Uzairu

2014

Pigment &Amp; Resin Technology

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Purpose -The purpose of this study is to determine the physicochemical and rheological parameters of Albizia lebbeck gum. Design/methodology/approach -Physicochemical analysis was carried out using recommended methods. Gas chromatography mass spectrophotometer and Fourier transformed infra red (FTIR) analyses were carried out using their respective spectrophotometer. Scanning electron microscopy was carried out using scanning electron microscope, while rheological measurements were carried out using Ubbelohde capillary viscometer, digital Brookfield DV 1 viscometer and a rheometer. Findings -Albizia zygia gum is an ionic gum with unique physical and chemical properties. Scanning electron micrograph revealed that the internal structure of the gum is porous with irregular molecular arrangement. Thermodynamic parameters of viscous flow indicated the existence of few interand intra-molecular interactions, and the attainment of transition state was linked to bond breaking. Coil overlap transition studies revealed the existence of dilute and concentrated regimes. The viscosity of the gum was also found to decrease with decrease in the charge of cation (such that Al 3ϩ Ͼ Ca 2ϩ Ͼ K ϩ ) and with increase in ionic strength.Research limitations/implications -The paper provided information on physicochemical and rheological characteristics/behaviour of Albizia zygia gum, of Nigerian origin. From this information, possible application of this gum in the food and pharmaceutical industries can be deduced. Originality/value -The paper is original since information concerning Albizia zygia gum of Nigerian origin are not well documented as established in the work. It also adds values on the use of Albizia zygia gum, either on its own or in combination with other gums for industrial purpose.

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Section: Thermodynamic Parameter Of Viscous Flowsupporting

confidence: 48%

Physicochemical studies and rheological modelling of Albizia lebbeck (AL) gum exudates

Eddy

Udofia

Uzairu

2014

Pigment &Amp; Resin Technology

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“…The value of E is considered as an energy barrier for the gelation of the polymeric solution at a particular temperature. 11 The intercept of the graph (Fig. 2B) was used to calculate Arrhenius constant and it was found to be 4.31.…”

Section: Resultsmentioning

confidence: 99%

Kheri (Acacia chundra, family: Mimosaceae) gum: Characterization using analytical, mathematical and pharmaceutical approaches

Malviya

Sharma

Dubey³

2018

Polim. Med.

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“…Nanostructured blend exhibited higher N 1 , S R , and G values in comparison to microstructured blend. It is interesting to note that apparent elasticity ( G ) of PA6/FKM blends at 240 °C is very high (19.2 MPa) when compared with the other PA6 based blends at 175 °C . Here, the values of recoverable shear strain ( S R ) of PA6/FKM blends are low at 240 °C, which could be due to the less time available for the polymer chains to recover at the melt state in the dynamic condition.…”

Section: Resultsmentioning

confidence: 93%

Distinct Melt Viscoelastic Properties of Novel Nanostructured and Microstructured Thermoplastic Elastomeric Blends from Polyamide 6 and Fluoroelastomer

Banerjee

Kumar

Bhowmick

2015

Macro Materials & Eng

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Distinct melt viscoelastic properties of novel polyamide 6 (PA6)/fluoroelastomer (FKM) thermoplastic elastomeric blends have been reported with special reference to the micro‐ and nano‐structures. In the entire frequency regime (0.0628–628 rad/s), nanostructured blend (the average dimension of the dispersed rubber phase, D ~ 90 nm) exhibited higher complex viscosity than the microstructured blend (D ~ 0.35 µm). The values of various interfacial parameters such as specific interfacial area per unit volume, interfacial tension, interaction parameter, interfacial thickness and infrared spectroscopic analysis confirmed the existence of more contact surface area between the blend components in nanostructured blend which increased intermolecular interaction. Due to the existence of greater restriction of mobility of the polymer chains, the relaxation time for the nanostructured blend was higher than that of the microstructured blend. The etched extrudate surface morphology was studied using field emission scanning electron microscopy and correlated with viscoelastic response of the blends.

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Melt elasticity and flow activation energy of nylon 6/polystyrene blends

Cited by 19 publications

References 7 publications

Physicochemical studies and rheological modelling of Albizia lebbeck (AL) gum exudates

Physicochemical studies and rheological modelling of Albizia lebbeck (AL) gum exudates

Kheri (Acacia chundra, family: Mimosaceae) gum: Characterization using analytical, mathematical and pharmaceutical approaches

Distinct Melt Viscoelastic Properties of Novel Nanostructured and Microstructured Thermoplastic Elastomeric Blends from Polyamide 6 and Fluoroelastomer

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