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Compatibilization and toughness modification of linear aliphatic epoxy compound on paving epoxy asphalt
Materials and Structures ( IF 3.8 ) Pub Date : 2020-04-01 , DOI: 10.1617/s11527-020-01473-0
Xiaoming Du , Peijun Xu , Peiliang Cong , Zhenjun Zhou

Epoxy asphalt (EA), which is usually prepared by diglycidyl ether of bisphenol A (DGEBA), curing agent and asphalt, is a kind of high-performance pavement material in highway construction. However, because of rigid molecular structure of DGEBA, poor compatibility with asphalt and high cross-linking density of three-dimensional network, cured EA usually has high strength but poor toughness especially at low temperature. In order to solve the problem of insufficient toughness of EA below glass-transition temperature ( T g ) and eliminate the potential brittle fracture of EA mixture, linear aliphatic epoxy compounds, which have low viscosity, good molecular flexibility, similar solubility parameter and polarity with asphalt or DGEBA resin, can be used as phase structure controller and toughner to modify EA. By introducing a little of linear aliphatic epoxy compound, such as 1, 4-butanediol diglycidyl ether (BDDGE) or 1, 6-hexanediol diglycidyl ether (HDDGE), not only the viscosity of EA could be significantly decreased during the curing process, but also the phase compatibility of EA could be improved. An obvious reduction in storage modulus ( E ′) at low temperature and decreased T g also prove that BDDGE or HDDGE modified EA have better toughness than neat EA at low temperature. The optimum amount of linear aliphatic epoxy compound based on its mixture with DGEBA should be 10–15 wt%.

中文翻译:

线性脂肪族环氧化合物在环氧沥青路面上的增容和韧性改性

环氧沥青(EA)通常由双酚A的二缩水甘油醚(DGEBA)、固化剂和沥青制成,是公路建设中的一种高性能路面材料。然而,由于DGEBA分子结构刚性,与沥青相容性差,三维网络交联密度高,固化后的EA通常强度高,但韧性较差,尤其是在低温下。为了解决 EA 在玻璃化转变温度 ( T g ) 以下韧性不足的问题,消除 EA 混合物潜在的脆性断裂,线性脂肪族环氧化合物具有低粘度、良好的分子柔韧性、与 EA 相似的溶解度参数和极性。沥青或DGEBA树脂,可作为相结构控制剂和增韧剂改性EA。通过引入少量线性脂肪族环氧化合物,如1, 4-丁二醇二缩水甘油醚(BDDGE)或1, 6-己二醇二缩水甘油醚(HDDGE),不仅可以显着降低EA在固化过程中的粘度,而且EA 的相位兼容性也可以提高。低温下储能模量 (E') 的明显降低和 Tg 的降低也证明 BDDGE 或 HDDGE 改性的 EA 在低温下比纯 EA 具有更好的韧性。基于其与 DGEBA 的混合物,线性脂肪族环氧化合物的最佳用量应为 10-15 wt%。低温下储能模量 (E') 的明显降低和 Tg 的降低也证明 BDDGE 或 HDDGE 改性的 EA 在低温下比纯 EA 具有更好的韧性。基于其与 DGEBA 的混合物,线性脂肪族环氧化合物的最佳用量应为 10-15 wt%。低温下储能模量 (E') 的明显降低和 Tg 的降低也证明 BDDGE 或 HDDGE 改性的 EA 在低温下比纯 EA 具有更好的韧性。基于其与 DGEBA 的混合物,线性脂肪族环氧化合物的最佳用量应为 10-15 wt%。
更新日期:2020-04-01
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