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首页> 外文期刊>Journal of industrial and engineering chemistry >Effects of MDI-PPG molecular weight on the thermorheological behaviour of MDI-isocyanate based bituminous foams
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Effects of MDI-PPG molecular weight on the thermorheological behaviour of MDI-isocyanate based bituminous foams

机译:MDI-PPG分子量对MDI-异氰酸酯基沥青泡沫热流变行为的影响

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摘要

Dimensionally stable bituminous foams were prepared by using 4,4'-diphenylmethane diisocyanate/ polypropylene glycol (MDI-PPG) quasi-prepolymers, with different molecular weights. From the results obtained, it may be concluded that, after foam formation, the Theological properties are remarkably affected, especially at high temperatures. Paradoxically, the greater the molecular weight of MDI-PPG, the lower the values of viscosities at 60 °C, and the linear viscoelasticity functions of the resulting foams. This result seems to be related to the improved ability of small MDI-PPG molecules to interact strongly with polar bitumen compounds, leading to the formation of larger molecular-sized compounds.
机译:通过使用具有不同分子量的4,4'-二苯基甲烷二异氰酸酯/聚丙二醇(MDI-PPG)准预聚物来制备尺寸稳定的沥青泡沫。根据获得的结果,可以得出结论,在形成泡沫之后,尤其是在高温下,流变性能受到显着影响。矛盾的是,MDI-PPG的分子量越大,在60°C时的粘度值越低,并且所得泡沫的线性粘弹性函数越低。该结果似乎与小MDI-PPG分子与极性沥青化合物强烈相互作用的能力增强有关,导致形成较大分子大小的化合物。

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