Abstract
ABSTRACTIn this study, the mechanical properties of ultrasonic welded lap joints of all‐polypropylene composite (APPC) were investigated and compared to the interlaminar properties of the composite sheet itself. The process control parameter was welding time: welded samples were prepared with an ultrasonic welding machine in the 0.1–1.0 second time range. In most cases, the shear strength of the welded samples exceeded that of the unwelded APPC. Although it was found that during the ultrasonic welding process, the reinforcing tapes partially melted in the welding zone (WZ), the seam remained strong enough because the heat released and the pressure applied during the welding process further improved the consolidation of the APPC layers. © 2019 The Authors. Journal of Applied Polymer Science published by Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48799.
Highlights
Polypropylene (PP) is one of the most frequently used polymer materials, owing to its low price, good processability and mechanical properties. [1,2,3] In order to achieve mechanical properties similar to those of engineering materials, neat PP has to be reinforced. [4,5,6,7] The most frequently used reinforcement is glass fibre (GF), which can improve both the modulus and the strength of the matrix material
The main problem is that the adhesion of glass fibres to the strongly non-polar PP is poor, fibres must be treated with a sizing material and/or a coupling agent needs to be added to the PP matrix or copolymerization of the PP material may be necessary. [8, 9] Another disadvantage of GF reinforcement is during the mechanical recycling of reinforced polymers, glass fibres become too fragmented, and lose their reinforcing ability
Three main methods are generally used for the production of all-polymer composite materials: hot compaction, consolidation of coextruded tapes and film stacking. [1820] Many papers focus on the mechanical properties of various all-polymer composites and the consolidation process of the matrix and fibre components. [16, 17, 21,22,23,24,25,26] Studies have confirmed that all-PP composites can be prepared by injection moulding. [21, 24] There are numerous uses of self-reinforced and all-polymer composites in the automotive industry, especially as interior components. [27]
Summary
Polypropylene (PP) is one of the most frequently used polymer materials, owing to its low price, good processability and mechanical properties. [1,2,3] In order to achieve mechanical properties similar to those of engineering materials, neat PP has to be reinforced. [4,5,6,7] The most frequently used reinforcement is glass fibre (GF), which can improve both the modulus and the strength of the matrix material. [4,5,6,7] The most frequently used reinforcement is glass fibre (GF), which can improve both the modulus and the strength of the matrix material. [11] recyclable and reprocessible all-polymer composite materials are increasingly used; they exhibit similar mechanical properties (when the difference in density is considered) to composites with traditional (for example glass or carbon fibre) reinforcements. Three main methods are generally used for the production of all-polymer composite materials: hot compaction, consolidation of coextruded tapes and film stacking. [1820] Many papers focus on the mechanical properties of various all-polymer composites and the consolidation process of the matrix and fibre components. [21, 24] There are numerous uses of self-reinforced and all-polymer composites in the automotive industry, especially as interior components. Secondary bonds can break, promoting chain movement at elevated temperatures. [35]
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