Kang Yang, Jin Rui, Wu Qiang, Pu Liang, Song Mingyu, Cheng Jixiang, Yu Pengfei
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
Department of Chemistry and Molecular Engineering, College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China.
Polymers (Basel). 2016 Mar 29;8(4):104. doi: 10.3390/polym8040104.
The present engineering practices show the potential that epoxy asphalt composites (EACs) would be a better choice to obtain long life for busy roads. To understand the service performance⁻related thermorheological properties of prepared bimodal anhydrides-cured rubber-like EACs (REACs), a direct tensile tester, dynamic shear rheometer and mathematical model were used. Tensile tests demonstrate that all the REACs reported here are more flexible than previously reported anhydrides-cured REACs at both 20 and 0 °C. The better flexibility is attributed to the change of bimodal networks, in which cross-linked short chains decreased and cross-linked long chains increased, relatively. Strain sweeps show that all the REACs have linear viscoelastic (LVE) properties when their strains are smaller than 1.0% from -35 to 120 °C. Temperature sweeps illustrate that the thermorheological properties of REACs evolve from thermosetting to quasi-thermosetting with asphalt content, and all the REACs retain solid state and show elastic properties in the experimental temperature range. A Cole⁻Cole plot and Black diagram indicate that all the REACs are thermorheologically simple materials, and the master curves were constructed and well-fitted by the Generalized Logistic Sigmoidal models. This research provides a facile approach to tune the thermorheological properties of the REACs, and the cheaper quasi-thermosetting REAC facilitates their advanced applications.
目前的工程实践表明，环氧沥青复合材料（EACs）有望成为繁忙道路长寿命的更佳选择。为了解制备的双峰酸酐固化橡胶状环氧沥青复合材料（REACs）与服役性能相关的热流变特性，采用了直接拉伸试验机、动态剪切流变仪和数学模型。拉伸试验表明，本文报道的所有REACs在20℃和0℃时都比先前报道的酸酐固化REACs更具柔韧性。更好的柔韧性归因于双峰网络的变化，其中交联短链相对减少，交联长链相对增加。应变扫描表明，在-35℃至120℃范围内，当应变小于1.0%时，所有REACs都具有线性粘弹性（LVE）特性。温度扫描表明，REACs的热流变特性随沥青含量从热固性演变为准热固性，并且在实验温度范围内所有REACs都保持固态并表现出弹性特性。Cole-Cole图和Black图表明，所有REACs都是热流变简单材料，并通过广义逻辑西格玛模型构建并很好地拟合了主曲线。本研究提供了一种调节REACs热流变特性的简便方法，且成本较低的准热固性REAC有利于其进一步应用。
