Abstract
The rheological properties of polybutene-1 with different molecular weight (M w) and polydispersity index (PDI) were studied by means of rubber-processing analyzer (RPA). The studies included strain sweeps, frequency sweeps, temperature sweeps, and stress relaxation tests after a sudden shear displacement. It is observed that the linear viscoelastic regions are basically identical for all the samples with different molecular structure and become smaller slightly with increasing frequency. The melts with larger M w and/or PDI present higher viscoelasticity moduli, melts viscosity, relaxation modulus, and better temperature stability, but lower loss factor and critical shear rate. Furthermore, it is found that crossover frequency decreases with increasing M w and crossover modulus increases with decreasing PDI. In addition, stress relaxation followed by substantial stress growth is observed for the PB-1 melt with larger M w in the stress relaxation measurement.
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Acknowledgments
This work was financially supported by the Special Foundation of Taishan Mountain Scholar Constructive Program, the National Natural Science Foundation of China (No. 21174074), Shandong Provincical Key R & D program (2015GGX102019), Shandong Provincial Natural Science Fund for Distinguished Young Scholars (No. JQ201213), and the Nature Science Foundation of Shandong Province (No. ZR2013BM004). We specially thank the support from the Yellow River Delta Scholar program [Office of National University Science & Technology Park Administrative Committee (China University of Petroleum)].
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Shao, H., Wang, S. & He, A. The influence of molecular weight on high shear rate macroscopic rheological properties of polybutene-1 melts through rubber-processing analyzer. Polym. Bull. 73, 3209–3220 (2016). https://doi.org/10.1007/s00289-016-1650-2
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DOI: https://doi.org/10.1007/s00289-016-1650-2