Investigation of Aging Resistance of Organic Layered Double Hydroxide/Antioxidant Composite-Modified Asphalt
Investigation of Aging Resistance of Organic Layered Double Hydroxide/Antioxidant Composite-Modified Asphalt
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DOI：
10.1021/acssuschemeng.2c05344
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Song Xu;Lu Liu;X. Jia;S. Tighe;Canlin Zhang;Hongyan Ma;Xinxing Zhou
中科院分区：
文献类型：
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作者：
Song Xu;Lu Liu;X. Jia;S. Tighe;Canlin Zhang;Hongyan Ma;Xinxing Zhou
采用阴离子交换法合成了对氨基苯甲酸（PABA）和肉桂酸（CA）插层的有机水滑石（OLDHs），并对其结构和性能进行了表征。然后，将这两种OLDH与两种抗氧剂3-（3，5-二叔丁基-4-羟基苯基）丙酸十八酯（1076）和季戊四醇四（3-（3，5-二叔丁基-4-羟基苯基）丙酸酯）（1010）一起用于改性沥青，旨在协同提高沥青的抗老化性能。通过对改性沥青在压力老化容器（PAV）和紫外线（UV）老化后的物理性能和化学结构的分析，评价了改性沥青的老化性能。结果表明，PABA和CA成功地插层到LDHs的层间，并使LDHs的亲油性和紫外吸光度显著提高。因此，与LDH改性沥青相比，OLDH改性沥青的抗紫外线老化性能有所提高。同时，有机LDH/抗氧剂复合物的加入能进一步提高沥青的抗老化性能，包括热氧化和光氧化老化性能，表现出协同效应。不同的OLDHs与抗氧剂组合对沥青老化性能的改善效果不同，其中1076/PABA-LDHs和1010/CA-LDHs的抗老化性能分别上级1010/PABA-LDHs和1076/CA-LDHs。
Two organic layered double hydroxides (OLDHs) intercalated by UV absorbents ofpara-aminobenzoic acid (PABA) and cinnamic acid (CA) were synthesized by the anion-exchange method, and their structures and properties were characterized. Then, the two OLDHs were applied to modify asphalt together with two different antioxidants, octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate (1076) and pentaerythritol tetrakis (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (1010), aiming at synergistically enhancing the aging resistance of asphalt. The aging behaviors of modified asphalt were evaluated by the analyses of physical properties and chemical structures of modified asphalt after pressurized aging vessel (PAV) and ultraviolet (UV) aging tests. The results indicated that PABA and CA were successfully intercalated into the interlayers of LDHs and that the lipophilicity and UV absorbance of LDHs were significantly improved due to the organic intercalation. Hence, OLDH-modified asphalt presented enhanced anti-UV aging performance compared with LDH-modified asphalt. Meanwhile, the addition of organic LDH/antioxidant composites could further improve the antiaging performance of asphalt, including thermal-oxidation and photo-oxidation aging resistance, exhibiting a synergistic effect. Furthermore, different combinations of OLDHs and antioxidants had different improvement effects on the aging properties of asphalt; to be specific, the composites of 1076/PABA-LDHs and 1010/CA-LDHs were superior to those of 1010/PABA-LDHs and 1076/CA-LDHs, respectively, in promoting the aging resistance of asphalt.