Rheological modification of bitumen with maleic anhydride and dicarboxylic acids
Rheological modification of bitumen with maleic anhydride and dicarboxylic acids
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DOI：
10.1016/s0016-2361(98)00120-3
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发表时间：
1999-01-01
期刊：
影响因子：
7.4
通讯作者：
Forbes, MC
中科院分区：
文献类型：
--
作者：
Herrington, PR;Wu, YQ;Forbes, MC
通过与马来酸酐 (MAH)、琥珀酸酐 (SAH) 和各种直链二羧酸反应（6 小时，150 摄氏度）改性的道路沥青的流变特性，采用毛细管粘度测定法、渗透法和动态剪切流变测定法 (DSR) 进行研究。通过气相色谱法、红外光谱法和凝胶渗透色谱法测量反应产物/共混物的化学性质。与之前的工作一致，与对照相比，沥青-MAH 反应产物被发现具有降低的温度敏感性（以 5 摄氏度时的复数模量 (G*) 与 50 摄氏度时的复数模量 (G*) 之比表示），并且在特性上更具弹性（降低损耗角正切值）。尽管只有 40-50% 的 MAH 与沥青发生不可逆反应（可能通过 Diels-Alder 机制），但 G* 的增加和 G*(5)/G*(50) 的减少大于使用 SAH 实现的效果。对于 MAH 和 SAH，观察到酸酐环几乎立即打开，因此对粘合剂流变学的影响归因于所得的二羧酸。还发现较长链的二元羧酸会增加 G* 并降低 tan δ，其影响程度随着链长度的增加而增加。二羧酸的 G*(5)/G*(50) 值略有降低，但是，使用长链二酸实现的温度敏感性降低与使用 SAH 获得的相似，但小于使用来自 MAH 的（共价键合：）酸基实现的温度敏感性降低。相反，癸酸（一元羧酸）相对于对照显着增加tanδ，G*(5)/G*(50)也增加。结果可以解释为沥青物质瞬态网络的形成（或现有的增强），通过氢键和偶极-偶极相互作用与二羧酸（两个酸基团是必要的）连接。 (C) 1998 Elsevier Science Ltd. 保留所有权利。
The rheological properties of roading bitumens, modified through reaction (6 h, 150 degrees C) with maleic anhydride (MAH), succinic anhydride (SAH) and various straight chain dicarboxylic acids, were investigated using capillary viscometry, penetration and dynamic shear rheometry (DSR). Chemical properties of the reaction products/blends were measured by gas chromatography, infrared spectroscopy and gel permeation chromatography. Consistent with previous work, bitumen-MAH reaction products were found to have reduced temperature sensitivity (in terms of the ratio of the complex modulus (G*) at 5 degrees C to that at 50 degrees C) and be more elastic in character (decreased tan delta), compared to the control. Although only 40-50% of the MAH had reacted irreversibly with the bitumen (probably by a Diels-Alder mechanism), the increase in G* and reduction in G*(5)/G*(50) was greater than that achieved using SAH. For both MAH and SAH, the anhydride ring was observed to open almost immediately so that the effect on binder rheology was attributed to the resulting dicarboxylic acids. Longer chain dicarboxylic acids were also found to increase G* and decrease tan delta, the magnitude of the effects increasing with chain length. Values of G*(5)/G*(50) for the dicarboxylic acids were slightly reduced, however, the reduction in temperature sensitivity, achieved with the long chain di-acids, was similar to that obtained with SAH, but less than that achieved with (covalently bound:) acid groups from MAH. In contrast, decanoic acid (a monocarboxylic acid) markedly increased tan delta relative to the control, G*(5)/G*(50) also increased. The results can be interpreted in terms of the formation (or enhancement of existing) transient networks of bitumen species, linked by hydrogen bonding and dipole-dipole interactions with the dicarboxylic acids (two acid groups are necessary). (C) 1998 Elsevier Science Ltd. All rights reserved.