Preparation and performance of 3-aminopropyltriethoxysilane surface modified layered double hydroxides on ultraviolet aging resistance of bitumen
Preparation and performance of 3-aminopropyltriethoxysilane surface modified layered double hydroxides on ultraviolet aging resistance of bitumen
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DOI：
10.1016/j.conbuildmat.2021.123411
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发表时间：
2021-05-04
影响因子：
7.4
通讯作者：
Duan, Wenfeng
中科院分区：
文献类型：
--
作者：
Zhang, Canlin;Wang, Ting;Duan, Wenfeng
3-制备了氨丙基三乙氧基硅烷表面有机层状双金属氢氧化物（OLDHs），并将其应用于提高沥青的抗紫外老化性能。X射线光电子能谱（XPS）分析表明，3-氨丙基三乙氧基硅烷被化学引入到LDHs表面，减少了水滑石表面的羟基自由基，并在LDHs表面引入了有机基团。与LDHs相比，OLDHs的颗粒团聚现象明显减少，粒径明显减小，有利于改善OLDHs在沥青中的相容性。经紫外光老化后，沥青变硬变脆，芳烃含量明显降低，沥青质含量明显增加，沥青的物理性能和流变性能严重恶化。LDHs的引入可以抑制紫外老化对沥青性能、化学结构和化学成分的影响，提高沥青的抗紫外老化性能，经过3-氨丙基三乙氧基硅烷表面有机改性后，LDHs的改善效果进一步显著增强。(c)2021爱思唯尔有限公司保留所有权利。
3-aminopropyltriethoxysilane surface organic layered double hydroxides (OLDHs) was prepared and applied to improve the ultraviolet aging resistance of bitumen. X-ray photoelectron spectrometry (XPS) showed that 3-aminopropyltriethoxysilane has been chemically introduced on the surface of LDHs, which resulted in the decrease of hydroxide radical and the introduction of organic groups on the surface of LDHs. Compared with LDHs, the particle agglomeration of OLDHs obviously diminished, the hydrophilia of OLDHs has been decreased obviously, which was beneficial to improve the compatibility of OLDHs in bitumen. After ultraviolet aging, bitumen became hard and brittle, aromatic obviously decreased, and asphaltene observably increased, the physical and rheological properties of bitumen seriously deteriorated. The introduction of LDHs could inhibit the impact of ultraviolet aging on the performance, chemical structure and chemical constituents of bitumen, and improve the ultraviolet aging resistance of bitumen, the improvement of LDHs was further enhanced significantly after 3-aminopropyltriethoxysilane surface organic modification.(c) 2021 Elsevier Ltd. All rights reserved.