二氧化碳对苯乙烯和乙烯基吡啶聚合物玻璃化转变的影响:量热、蠕变和流变实验的比较

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2022-10-03 DOI:10.1155/2022/5602902
Felix Harden, M. Kargar, U. A. Handge
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引用次数: 1

摘要

非晶聚合物的玻璃化转变决定了聚合物链的迁移率和弛豫过程的时间尺度。玻璃化转变温度由于存在低分子量分子,例如溶解气体或有机溶剂而降低。在聚合物熔体中加入二氧化碳引起的玻璃化转变温度降低的定量知识与泡沫挤出高度相关。然而,测量由气体加载引起的玻璃化转变温度的降低必须在高压下进行,这意味着很高的实验努力。在这项工作中,我们讨论并比较了测定二氧化碳对非晶聚合物热性能影响的三种方法,即量热测量、蠕变试验和流变实验。阐述了这些方法的优缺点。此外,还讨论了苯乙烯和乙烯基吡啶聚合物的分子结构对玻璃化转变温度的影响。一般来说,聚苯乙烯的玻璃化转变温度降低幅度最大。与聚苯乙烯相比,聚(2-乙烯基吡啶)和聚(4-乙烯基吡啶)表现出稍不明显的行为,因为聚苯乙烯的极性较低。在量热和流变实验中,聚α-甲基苯乙烯的玻璃化转变温度与气体负载的关系不同。
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Influence of Carbon Dioxide on the Glass Transition of Styrenic and Vinyl Pyridine Polymers: Comparison of Calorimetric, Creep, and Rheological Experiments
The glass transition of amorphous polymers determines the mobility of polymer chains and the time scale of relaxation processes. The glass transition temperature is reduced by the presence of low molecular weight molecules, e.g., dissolved gases or organic solvents. The quantitative knowledge of reduction of the glass transition temperature caused by the addition of carbon dioxide in a polymer melt is highly relevant for foam extrusion. However, measurement of the reduction of glass transition temperature caused by gas loading has to be performed under elevated pressure which implies high experimental efforts. In this work, we discuss and compare three methods for determination of the influence of carbon dioxide on thermal properties of amorphous polymers, i.e., calorimetric measurements, creep tests, and rheological experiments. The advantages and disadvantages of these methods are elucidated. Furthermore, the influence of molecular structure of the styrenic and vinylpyridine polymers on the glass transition temperature is discussed. Polystyrene generally shows the highest reduction of glass transition temperature. Poly(2-vinylpyridine) and poly(4-vinylpyridine) show a slightly less pronounced behaviour in comparison to polystyrene because of the lower polarity of polystyrene. Poly(α-methyl styrene) is associated with a different dependence of glass transition temperature on gas loading in calorimetric and rheological experiments.
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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