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Swelling and diffusion characteristics of polar and nonpolar polymers in asphalt

机译:极性和非极性聚合物在沥青中的溶胀和扩散特性

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The swelling and diffusion characteristics of a polar polymer [ethylene vinyl acetate (EVA)] and a nonpolar polymer [low-density polyethylene (LDPE)] were studied with swelling experiments of the polymers in asphalt at different temperatures. The study showed that the diffusion mechanisms for LDPE and EVA were different and temperature-dependent. In the case of LDPE, the observed diffusion was anomalous at both swelling temperatures (70 and 90 degrees C). LDPE at 90 degrees C showed sigmoidal solvent-uptake behavior during the initial period of swelling and a sorption overshoot in a later period. EVA showed Fickian transport at 60 degrees C and anomalous diffusion at a higher swelling temperature (70 degrees C) with sigmoidal uptake behavior. An analysis of the diffusion coefficients and the Fourier transform infrared results showed that the diffusing molecules were different in the case of LDPE and EVA, and there were possible polymer-asphalt interactions. Differential scanning calorimetry and swelling studies showed that penetrant-incluced crystallization affected the diffusion process in the case of LDPE. (C) 2008 Wiley Periodicals, Inc.
机译:通过在不同温度下沥青中聚合物的溶胀实验研究了极性聚合物[乙烯乙酸乙烯酯(EVA)]和非极性聚合物[低密度聚乙烯(LDPE)]的溶胀和扩散特性。研究表明,LDPE和EVA的扩散机制是不同的,并且取决于温度。在LDPE的情况下,在两个膨胀温度(70和90摄氏度)下观察到的扩散都是异常的。在90摄氏度下的LDPE在膨胀的初期显示出S型溶剂吸收行为,在后期吸收超调。 EVA在60摄氏度时表现出Fickian运移,并在较高的溶胀温度(70摄氏度)下出现异常扩散,并具有S型吸收行为。对扩散系数和傅立叶变换红外结果的分析表明,在LDPE和EVA情况下,扩散分子不同,并且可能存在聚合物-沥青相互作用。差示扫描量热法和溶胀研究表明,在LDPE的情况下,未渗透渗透剂的结晶会影响扩散过程。 (C)2008 Wiley期刊公司

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