| Study on the viscoelastic behavior of SEEPS block copolymer based on a modified BSW model |
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| 作者姓名： | WANG Wanjie ZHENG Qiang YU Qiuming |
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| 作者单位： | [1]Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China [2]State Key Laboratory of Fluid Power Control and Transmission, Zhejiang University, Hangzhou 310027, China |
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| 基金项目： | This work was supported by the National Science Foundation for Distinguished Young Scholars （Grant No. 50125312） and the National Natural Science Foundation of China （Grant No. 50133020）. |
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| 摘 要： | Studies on the viscoelastic behavior of styreneethylene-（ethylene-propylene）] -styrene block copolymer （SEEPS） were carried out, and some characteristic viscoelastic parameters were calculated. The longest relaxation time was obtained through simulating the relaxation spectrum on the basis of a modified Baumgaertel-SchausbergerWinter （mBSW） model. The results revealed that there exists a “second plateau” in the low frequency region of the master curves. The reason for this phenomenon is attributed to the entanglement of macromolecular chains. It is suggested that the hard blocks, polystyrene, act as entanglement points, resulting in a topology restraint to the movement of macromolecular chains. Meanwhile, it is found that the horizontal shift factors （aT） vs temperature in the master curve could be fitted to the WiUiams-Landel-Ferry （WLF） equation and Arrhenius equation respectively and the flow activation energy （Ea） is 127.88 kJ/mol. In addition, the plateau modulus （GN） and entanglement molecule weight （Me） were calculated.
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| 关 键 词： | 苯乙烯共聚物 时间温度重合法则 黏弹性参数 时间光谱 频率曲线 |
| 收稿时间： | 2005-01-21 |
| 修稿时间： | 2005-01-212005-03-15 |
Study on the viscoelastic behavior of SEEPS block copolymer based on a modified BSW model |
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| WANG Wanjie ZHENG Qiang YU Qiuming.Study on the viscoelastic behavior of SEEPS block copolymer based on a modified BSW model[J].Chinese Science Bulletin,2005,50(19):2171-2175. |
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| Authors: | Wanjie Wang Qiang Zheng Qiuming Yu |
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| Institution: | 1. Department of Polymer Science and Engineering, Zhejiang University, 310027, Hangzhou, China
2. State Key Laboratory of Fluid Power Control and Transmission, Zhejiang University, 310027, Hangzhou, China
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| Abstract: | Studies on the viscoelastic behavior of styrene-ethylene-(ethylene-propylene)]-styrene block copolymer (SEEPS) were carried
out, and some characteristic viscoelastic parameters were calculated. The longest relaxation time τmax was obtained through simulating the relaxation spectrum on the basis of a modifiedBaumgaertel-Schausberger-Winter (mBSW) model. The results revealed that there exists a “second plateau” in the low frequency region of the master curves. The reason for this phenomenon is attributed to the entanglement of macromolecular
chains. It is suggested that the hard blocks, polystyrene, act as entanglement points, resulting in a topology restraint to
the movement of macro-molecular chains. Meanwhile, it is found that the horizontal shift factors (aT) vs temperature in the master curve could be fitted to theWilliams-Landel-Ferry (WLF) equation andArrhenius equation respectively and the flow activation energy (Ea) is 127.88 kJ/mol. In addition, the plateau modulus (GN
0 and entanglement molecule weight (Me) were calculated. |
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| Keywords: | SEEPS time-temperature superposition principle dynamic viscoelastic behavior relaxation time spectrum |
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