Abstract
The effect of silane crosslinking reaction on properties and structure of polypropylene (PP)/ethylene–octene elastomer (POE) blends had been carried out. FTIR and gel content tests confirmed the grafting and crosslinking reaction mechanism of PP/POE blends. The incorporation of POE phase enhanced the crosslinking degree and thermal stability of blends. Crystallinity of silane-crosslinked PP/POE blends decreased sharply, and the melting points change a little with the POE content increasing. The rheological curves of silane-crosslinked PP/POE blends showed an obvious “gel point”, corresponding to the dynamic crosslinking network. Solvent resistance tests suggested crosslinking had a great improvement of solvent resistance. The blends with 30% POE had good comprehensive mechanical properties. Scanning electron microscopy images exhibited that crosslinking had a great influence on the morphologies of silane-crosslinked PP/POE blends. Characterization results indicated the “gel point” acquired from rheology had some corresponding relationship with mechanical properties and solvent resistance.
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Acknowledgements
This work was financially supported by Outstanding Young Talent Research Fund of Zhengzhou University (No. 1521320024), National Natural Science Foundation of China (No. 51373157) and Open Fund of Key Laboratory of Materials Preparation and Protection for Harsh Environment (Nanjing University of Aeronautics and Astronautics).
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Peng, H., Lu, M., Lv, F. et al. Understanding the effect of silane crosslinking reaction on the properties of PP/POE blends. Polym. Bull. 76, 6413–6428 (2019). https://doi.org/10.1007/s00289-019-02724-z
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DOI: https://doi.org/10.1007/s00289-019-02724-z