| 超高分子量聚乙烯凝胶的流变行为 |
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| 引用本文： | 刘方可,王建,彭炯,安明月,邵明旺,丁永志.超高分子量聚乙烯凝胶的流变行为[J].塑料,2020,49(1):85-89. |
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| 作者姓名： | 刘方可 王建 彭炯 安明月 邵明旺 丁永志 |
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| 作者单位： | 北京理工大学,化学与化工学院,北京100081;北京化工大学,机电工程学院,北京100029 |
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| 基金项目： | 国家自然科学基金(51873021)。 |
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| 摘 要： | 采用旋转流变仪研究了超高分子量聚乙烯(UHMWPE)凝胶的流变行为。通过动态应变扫描测定了UHMWPE凝胶的线性黏弹区;通过动态温度扫描、动态频率扫描和稳态速率扫描研究了温度、浓度、剪切速率对凝胶流变行为的影响。结果表明,浓度为2%~22%的UHMWPE凝胶的线性黏弹区对应的应变下限为2%,上限为40%,且温度对凝胶线性黏弹区的影响较大;浓度为6%的UHMWPE凝胶,在180℃时,弹性模量最大,凝胶内部的黏结性最强;UHMWPE凝胶熔体的黏度随扫描频率、剪切速率的升高而降低,呈现明显的剪切变稀行为,属于假塑性流体;剪切速率较高时,UHMWPE凝胶的黏度对温度的变化更敏感。
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| 关 键 词： | 超高分子量聚乙烯 凝胶 流变 线性黏弹区 黏度 |
Rheological Behaviour of Ultra High Molecular Weight Polyethylene Gel |
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| LIU Fangke,WANG Jian,PENG Jiong,AN Mingyue,SHAO Mingwang,DING Yongzhi.Rheological Behaviour of Ultra High Molecular Weight Polyethylene Gel[J].Plastics,2020,49(1):85-89. |
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| Authors: | LIU Fangke WANG Jian PENG Jiong AN Mingyue SHAO Mingwang DING Yongzhi |
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| Affiliation: | (School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 100081,China;School of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China) |
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| Abstract: | The rheological behaviour of ultra high molecular weight polyethylene(UHMWPE)gel was studied by using a rotary rheometer.The linear viscoelastic range of the UHMWPE gel was determined by dynamic strain scanning.The effects of temperature,concentration and shear rate on the rheological behaviour of gels were investigated by dynamic temperature scanning,dynamic frequency scanning and steady-state rate scanning.Results showed that the linear viscoelastic region of UHMWPE gel with a concentration of 2%~22%corresponded to a lower strain limit of 2%and an upper limit of 40%,and temperature had a great influence on the linear viscoelastic region of gels.UHMWPE gel with a concentration of 6%had the highest elastic modulus and the strongest adhesion at 180℃.The viscosity of UHMWPE gel melt decreased with the increase of scanning frequency and shear rate.It was exhibited obvious shear-thinning behaviour and belonged to pseudoplastic fluid.The viscosity of the gel was more sensitive to the variation of temperature at higher shear rates. |
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| Keywords: | ultra high molecular weight polyethylene gel rheology linear viscoelastic region viscosity |
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