Effect of sodium oleate addition on the morphology of polypropylene‐<i>co</i>‐polyamide blends

Цебренко, М. В.; Резанова, Н. М.; Nikolaeva, A. P.; Tsebrenko, I. A.; Lazăr, Iosif

doi:10.1002/pen.11490

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…Therefore, sodium oleate (SO) was used in this study to improve the electrical conductivity. 22 The effect of different additives with varying percentages on the fiber diameter has been investigated. In addition, the effects of melt electrospinning die shapes, including trilobal, tetralobal, multilobal and circular, on the cross-sectional shape of resultant fibers was investigated.…”

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Effect of viscosity and electrical conductivity on the morphology and fiber diameter in melt electrospinning of polypropylene

Nayak

Padhye

Kyratzis

et al. 2012

Textile Research Journal

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The feasibility of fabricating polypropylene (PP) nanofibers has been explored by using different additives, such as sodium oleate (SO), poly(ethylene glycol) (PEG) and poly(dimethyl siloxane) (PDMS), during melt electrospinning. PP of high melt flow index (1000) was used with PEG and PDMS for the reduction of the melt viscosity; and it was used with SO for improving the electrical conductivity during melt electrospinning. It was observed that all the additives used in this study helped to reduce the fiber diameter. The most promising additive, SO, was effective in reducing the fiber diameter to the nanometer scale due to the increase in the electrical conductivity. The fiber diameter was decreased by the addition of PEG and PDMS due to the decrease in the melt viscosity. The effect of die shape on the fiber cross-sectional shape was analyzed and an interesting finding is that the die shapes did not have an effect on the cross-sectional shape of the fibers. That is, irrespective of the die shapes (i.e. trilobal, tetralobal, multilobal and circular) used in this study, the cross-sectional shapes of melt electrospun fibers were circular. The distribution of the additives in the fiber was analyzed by energy-dispersive X-ray analysis and was found to be uniform. Tensile tests were performed on single nanofibers with limited success, due to the problems in preparing fiber samples and successfully holding them in the jaws of the testing machine without slippage.

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confidence: 99%

Effect of viscosity and electrical conductivity on the morphology and fiber diameter in melt electrospinning of polypropylene

Nayak

Padhye

Kyratzis

et al. 2012

Textile Research Journal

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“…Sodium oleate is a polar substance that must show a plasticizing action in a molten blend. However, by virtue of the realization of strong specific interactions (dipole-dipole and ion-dipole bonds), the plasticizing effect is suppressed and the viscosity of the molten blend increases due to its cross-linking [14]. As a consequence, the processes of melting and crystallization in the ternary blend are not different, in practice, from those for the binary blend.…”

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confidence: 93%

Investigation of the regularities of phase transitions in multicomponent polymer blends

Tsebrenko

Dzyubenko

Nikolaeva

2004

J Eng Phys Thermophys

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The influence of the compatibilizers of an ethylene-vinyl acetate copolymer and sodium oleate on the processes of melting and crystallization and the supermolecular structure of polypropylene/copolyamide blends of composition 20/80, 40/60, and 50/50 wt.% has been investigated. It has been shown that a specific fiberization is clearly realized in the compatibilized blends even for compositions corresponding to the region of phase change. Two to three peaks of crystallization of polypropylene in the blends containing an ethylenevinyl acetate copolymer or sodium oleate have been revealed, which is attributed to the increase in the degree of dispersion of polypropylene as a result of the improvement in the specific fiberization and to the growth in the fraction of polypropylene in the interphase transition layer.It is well known [1] that polymer blends are being used in a modern, simple, and efficient method of modifying them and obtaining products with completely new properties. Thus, for example, processing of polymer blends opens up a completely new avenue for production of ultrafine synthetic fibers (microfibers). We are dealing with the so-called phenomenon of specific fiberization [2], where one (fiberizing) component forms numerous microfibers strictly oriented in the direction of extrusion in the mass of another (matrix) component in the case of flow of a molten blend. The morphology of a polymer blend is determined not only by the microrheological processes (deformation of droplets to liquid jets, disintegration of the latter into droplets, and migration on the radius of the extruder-die orifice) at the stage of processing but also to a large extent by the capacity of the blended polymers for crystallization and by the conditions under which it occurs. Realization of specific fiberization substantially depends on the degree of compatibility of the components of the blend and the possibility of forming a transition layer transferring the deforming force from the matrix polymer to the fiberizing polymer. Commercially produced polymers are thermodynamically incompatible, as a rule. Therefore, in processing their blends, one adds special substances improving their compatibility; they are called compatibilizers [3]. Physicochemical processes in compatibilized polymer blends were investigated in [4,5] in detail, but no consideration was given to phase transitions.This work seeks to study the processes of melting and crystallization in ternary compatibilized polymer blends.Objects and Methods of Investigation. Blends of polypropylene (PP) and copolyamide (CPA) with a ratio of the components of 20/80, 40/60, and 50/50 were used as the objects of investigation. Copolyamide represented a caprolactam-AH (adipic acid and hexamethylene diamine) salt copolymer of composition 50/50. The characteristics of the starting polymers have been given in [4,5]. As the compatibilizers we used an ethylene-vinyl acetate copolymer (EVAC) and sodium oleate. We added EVAC in an amount of 5, 10, 20, and 25% of the PP mass. The amount of ...

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“…This promising direction in the colloid chemistry of fibre formation is in the stage of intensive development related to the necessity of establishing the effect of compatibility on microrheological processes at the basis of specific fibre formation --stretching of drops of polymer in the disperse phase, fusion of liquid jets in the direction of flow, coalescence of drops, etc. [ 11].…”

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Colloid chemical problems in production and use of chemical fibres

Lipatov¹

2000

Fibre Chem

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The variety of problems related to the production and use of chemical fibres, the intensive development of this area of chemical engineering, and the even more intensive use of chemical fibres for creating polymeric composite materials has made it scientifically difficult to clearly define the area of fundamental science in which these problems fall. Moreover, this is not an idle question, as it is important with respect to using theoretical concepts for the further development of this area. We would like to point out that the well-known (although forgotten in time) principles of colloid chemistry ofmacromolecular compounds are the basis of many phenomena and processes in the production and use of chemical fibres.According to the current definition of the subject matter of colloid chemistry, it can be represented as an area of science which describes processes in polymer systems where a major role is played by surface phenomena [1]. The colloid chemistry of any substances, including polymers, examines surface and interfacial phenomena on the interface between two bodies (of polymeric or nonpolymeric nature), including adsorption, adhesion, wetting and spreading, formation of thin boundary layers, surface tension of polymer solutions and blends, phase equilibria in multicomponent systems related to the appearance ofmicroheterogeneity on the colloidal level, rheology of polymeric disperse systems, formation of emulsions and dispersions, and other processes related to the formation of microheterogeneous disperse structures. The study of reactions on interfaces and determination of the qualitative characteristics of the colloidal solutions which distinguish them from true solutions are a special division of colloid chemistry [2]. The most important and characteristic properties of colloids are related to the existence of an interface in colloidal systems.Finally, the study of formation of colloidal phase particles in the dispersion medium, which is especially important when polymer blends are used, is an important division of the colloid chemistry of polymers. To emphasize the importance of colloid chemical approaches in creating man-made fibres, it is necessary to recall that the development of the industry in the thirties and forties was based on studying the characteristics of concentrated solutions of polymers exhibiting colloidal properties, the study of the rheological properties of such solutions, their behavior on addition of precipitators, and the study of other problems traditionally related to colloid chemistry. The first man-made fibre laboratory in Russia was set up in 1929 by S. M. Lipatov at the L. Ya. Karpov Institute of Physical Chemistry and the laboratory's research was based on the principles of colloid chemistry [4]. Fibre dyeing processes caused by adsorption of dyes on both the surface and in the bulk of the fibre were examined previously [5] and are currently being considered based on the premises of colloid chemistry. The important problems of fabrication of fibre materials related to impregn...

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Effect of sodium oleate addition on the morphology of polypropylene‐co‐polyamide blends

Cited by 11 publications

References 6 publications

Effect of viscosity and electrical conductivity on the morphology and fiber diameter in melt electrospinning of polypropylene

Effect of viscosity and electrical conductivity on the morphology and fiber diameter in melt electrospinning of polypropylene

Investigation of the regularities of phase transitions in multicomponent polymer blends

Colloid chemical problems in production and use of chemical fibres

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