Effect of Reinforcement Orientation on the Mechanical Properties of Microfibrillar PP/PET and PET Single‐Polymer Composites

McCardle, Ryan; Bhattacharyya, Debes; Fakirov, S.

doi:10.1002/mame.201100220

Cited by 29 publications

(26 citation statements)

References 75 publications

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“…A competitive method that can be used in the preparation of the self‐reinforced composites on a large scale was proposed by Fakirov and his team. In a series of articles they presented the results of wide spectrum of research work. This technique involves the preparation of bicomponent polymer blend in the extrusion process, the second stage of process is drawing, the oriented structure of microfibrils is achieved using the rotating roller system.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of the self‐reinforced composites using co‐extrusion technique

Andrzejewski

Szostak

Barczewski

et al. 2014

J of Applied Polymer Sci

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The results of this work relate to the use of co‐extrusion technology in the preparation of monocomposite pellets. The low‐melting polypropylene copolymer was used as a matrix material. The high strength polypropylene fibers were used as a fibrous reinforcement. Research confirms the possibility to produce the pellets with fibrous structure. The prepared composite material in the form of pellets was processed and shaped using the injection molding technology. Obtained samples were subjected to mechanical testing in the static tensile test and dynamic mechanical analysis. Research complements microscopic observation of scanning electron microscopy. The measurement results confirm the reinforcing effect of the fibers. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41180.

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Section: Resultsmentioning

confidence: 99%

Fabrication of the self‐reinforced composites using co‐extrusion technique

Andrzejewski

Szostak

Barczewski

et al. 2014

J of Applied Polymer Sci

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“…The NFCs show a superior reinforcement effect when compared to the previous work with MFCs using the same basic polymers, showing a 116% reinforcement effect compared to 77% for the MFCs. What is more impressive though, is the much improved reinforcement effect for the crossply and chaotic reinforcement orientations.…”

Section: Discussionmentioning

confidence: 60%

“…The first expectation was, that using the same manufacturing techniques used in previous research into MFCs, NFCs can be made with reinforcement orientations such that it can withstand stresses in multiple directions; and that these would approximate the reinforcement effects in a traditional composite with the same orientations. NFCs can definitely be made using these techniques with essentially any fibril orientation desired, as the manufacturing process lends itself to creating MFCs and NFCs with multiple plys.…”

Section: Resultsmentioning

confidence: 99%

“…In order to determine the characteristics of the nanofibrils, such as aspect ratio and diameter it was necessary to isolate them from the matrix. In addition, to determine if single polymer composites could be prepared from the nanofibrils as had been done in previous studies the isolation was done carefully to try and maintain the orientation of the nanofibrils. To prepare neat fibrils from the nanofibril loaded yarn, a modified Soxhlet extractor was used.…”

Section: Experimental Partmentioning

confidence: 99%

“…Specifically it seeks to test the following hypotheses: (i) that using the same manufacturing techniques as previous uniaxial samples, NFCs can be made with reinforcement orientations such that it can withstand stresses in multiple directions, and that these approximate the changes in strength that would be expected from these reinforcement orientations in a traditional composite; (ii) that the mechanical properties of these NFCs will be superior to their MFC cousins that were the subject of a previous study which showed that the nanofibrils were superior to microfibrils when compared in single polymer composites.…”

Section: Introductionmentioning

confidence: 99%

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Nanofibrillar Polymer‐Polymer Composites: Effect of Reinforcement Orientation on the Mechanical Properties

McCardle

Fakirov

Bhattacharyya

2013

Macromolecular Symposia

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Summary In‐situ poly (ethylene terephthalate) (PET) nanofibrils were created by drawing of melt blended polypropylene and PET. The drawn blend was used to prepare polymer‐polymer nanofibrillar composites (NFCs), in order to compare the effect of different fibril orientations on the mechanical properties. The resulting composites showed excellent improvements in stiffness of 116% vs. the isotropic PP matrix for uniaxial NFCs, with the highest recorded modulus of 4.16 GPa for a uniaxial NFC sample, and 3.41 GPa for a crossply sample. Scanning electron microscopy observations confirmed that the nanofibrillar structure and excellent alignment was maintained. Comparisons were also drawn between the composites created in this study, and previous work on microfibrillar composites.

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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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Effect of Reinforcement Orientation on the Mechanical Properties of Microfibrillar PP/PET and PET Single‐Polymer Composites

Cited by 29 publications

References 75 publications

Fabrication of the self‐reinforced composites using co‐extrusion technique

Fabrication of the self‐reinforced composites using co‐extrusion technique

Nanofibrillar Polymer‐Polymer Composites: Effect of Reinforcement Orientation on the Mechanical Properties

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

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