Evolution of polymer blend morphologies during extrusion in a flat die

Sollogoub, Cyrille; Guinault, Alain

doi:10.1007/s12289-009-0532-7

Cited by 1 publication

(1 citation statement)

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“…The morphology of the blend can also be controlled by the geometry and dimensions of the die. Sollogoub et al [187] have investigated the evolution of the polymer blend morphology through a flat die. They mentioned that in the flat die, the polymer melt is first exposed to a divergent flow at the entrance of the slit assembly, then to a convergent elongational flow at the exit through the die, which leads to an elongation of the dispersed component.…”

Section: Die Geometrymentioning

confidence: 99%

Relationship between the Processing, Structure, and Properties of Microfibrillar Composites

2020

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biomedical products. [3] However, the key to developing new materials does not only lie in the polymer synthesis itself but also in the modification of available polymers. The most frequent modification method is melt blending of different polymers because it is considered an easy way of making new materials with outstanding properties, such as toughness, stiffness, and chemical and thermal resistance. A number of comprehensive studies on polymer blending [4-13] have pointed out the importance of the microstructure of the blends and its relationship with physical and mechanical properties. [14-16] Moreover, what happens during the processing of the blends is important as the flow and viscosity of the polymers may affect the final blends' properties. [7,17] The morphology strongly depends on mixing methods, and the size and shape of the dispersed component are crucial for obtaining good mechanical performances. [18] On the one hand, polymer blends may meet some limitations in obtaining optimal physical and mechanical properties due to the interfacial separation that will occur as a result of the immiscibility of two or more components. [5,7-9,19-22] Therefore, it is necessary to control the morphology of the immiscible blend, like the size and shape of the dispersed component. [4,10] On the other hand, the blend with well-dispersed particles may increase the impact strength of the matrix, [18] while blends with sheet-shaped dispersions may improve barrier properties [23] and those with fibers can improve the unidirectional strength. [18] Still, the improvement of any given property will strongly depend on the rigidity of the dispersed component, as there is a huge difference in the reinforcement effect of rigid and elastomeric particles. [11,15,24,25] By varying the composition, and the viscosity and elasticity ratio of the components used in blending, the phase morphology can be optimized. [4,7,10,26] However, to overcome the problem of immiscibility, different fillers or compatibilizers are frequently used to promote the interfacial adhesion between the polymeric constituents. [11,27-35] The purpose of incorporation of compatibilizers into polymer mixtures is to reduce the particle size and hinder the coalescence effect, to improve the dispersion and distribution of the minor component and to increase the interfacial adhesion between the matrix and the dispersed component. In fact, the compatibilizer reduces the interfacial energy and facilitates the stress transfer across the matrix-particle interface. [11,27,29,34-36] The relationship between processing, morphology, and properties of polymeric materials has been the subject of numerous studies of academic and industrial research. Finding an answer to this question might result in guidelines on how to design polymeric materials. Microfibrillar composites (MFCs) are an interesting class of polymer-polymer composites. The advantage of the MFC concept lies in developing in situ microfibrils by which a perfect homogeneous distribution of the reinforcement in the ma...

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Section: Die Geometrymentioning

confidence: 99%