The effect of 1,3:2,4-bis-O-(p-methylbenzylidene)-d-sorbitol (PDTS) on uniaxial elongational viscosity of polypropylene |
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Authors: | Hideyuki Uematsu Yuji Aoki Masataka Sugimoto Takashi Taniguchi Kiyohito Koyama |
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Affiliation: | (1) Department of Polymer Science and Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa Yamagata, 992-8510, Japan |
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Abstract: | We investigated the dynamic viscoelasticity and elongational viscosity of polypropylene (PP) containing 0.5 wt% of 1,3:2,4-bis-O-(p-methylbenzylidene)-d-sorbitol (PDTS). The PP/PDTS system exhibited a sol–gel transition (T gel) at 193 °C. The critical exponent n was nearly equal to 2/3, in agreement with the value predicted by a percolation theory. This critical gel is due to a three-dimensional network structure of PDTS crystals. The elongational viscosity behavior of neat PP followed the linear viscosity growth function 3η + (t), where η + (t) is the shear stress growth function in the linear viscoelastic region. The elongational viscosity of the PP/PDTS system also followed the 3η + (t) above T gel but did not follow the 3η + (t) and exhibited strong strain-softening behavior below T gel. This strain softening can be attributed to breakage of the network structure of PDTS with a critical stress (σ c) of about 104 Pa. |
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Keywords: | Polypropylene PDTS Sol-gel transition Uniaxial elongational viscosity Strain softening Critical stress |
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