Summary
An investigation of the influence of short-chain branched length on impact behavior of linear high density polyethylene (HDPE), short-chain branched polyethylenes (SBPEs) and their fiber reinforced samples is reported. The result shows that the total impact energies (Et) increased with increasing branch length at any given temperature used in this study. Similar trend was found for their fiber reinforced samples. For a given polyethylene resin, Et increased with fiber content up to 5%, and then decreased consistently with further increase of fiber content. The amount of Et improved due to the presence of 5% carbon fibers increased significantly with the branch length at temperatures higher than 25°C. In addition, the fracture surface morphology indicated that the adhesion between carbon fibers and PE resins increased with the branch length. However, the adhesion and the amount of Et improved due to the presence of 5% carbon fibers reduced significantly with decreasing temperature. Finally, it was found that Et decreased slightly with rising temperature until the temperature reached around 40°C, and then increased sharply with increasing temperature. It is suggested that this “transition” behavior is related to the molecular motion accounting for the α transition of PE resins.
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Yeh, J.T., Chen, BJ. & Lee, HM. Impact properties of carbon fiber reinforced linear and short-chain branched polyethylenes. Polymer Bulletin 33, 607–614 (1994). https://doi.org/10.1007/BF00296171
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DOI: https://doi.org/10.1007/BF00296171