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探究线性和交联聚烯烃弹性体-甲基丙烯酸缩水甘油酯对沥青性能的影响。

Probing the Effect of Linear and Crosslinked POE--GMA on the Properties of Asphalt.

作者信息

Zhang Yujuan, Qian Pei, Xiao Peng, Kang Aihong, Jiang Chenguang, Kou Changjiang, Wang Zhifeng, Li Yuqing

机构信息

College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China.

Research Center for Basalt Fiber Composite Construction Materials, Yangzhou 225127, China.

出版信息

Materials (Basel). 2023 Oct 5;16(19):6564. doi: 10.3390/ma16196564.

DOI:10.3390/ma16196564
PMID:37834700
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10574489/
Abstract

The copolymer ethylene-octene (POE) has good aging resistance and is an inexpensive asphalt additive compared to the styrene-butadiene-styrene copolymer (SBS). However, POE is easy to segregate in asphalt during storage at high temperatures. Grafting glycidyl methacrylate (GMA) onto the molecular backbone of POE (i.e., POE--GMA) may solve this problem, for the epoxy groups in GMA can react with the active groups in asphalt. Asphalt modified with linear and crosslinked POE--GMA were prepared, and the hot storage stability, physical properties and thermal oxidation aging properties were discussed in detail. The results show that linear and low-degree crosslinked POE--GMA-modified asphalts are storage-stable at high temperatures via measurements of the difference in softening points and small-angle X-ray scattering (SAXS) characterizations from macro and micro perspectives. The difference in softening points (ΔSP) between the upper and lower ends is no more than 3.5 °C for modified asphalts after 48 h of being in an oven at 163 °C. More importantly, the crosslinking modification of POE--GMA can further increase the softening point and reduce the penetration as well as rheological properties via conventional physical property, dynamic shear rheometer (DSR) and multiple-stress creep recovery (MSCR) tests. Furthermore, asphalt modified with crosslinked POE--GMA reveals better aging resistance via measurements of the performance retention rate and electron paramagnetic resonance (EPR) characterizations after a rolling thin film oven test (RTFOT). This work may provide further guidelines for the application of polymers in asphalt.

摘要

乙烯-辛烯共聚物（POE）具有良好的抗老化性能，与苯乙烯-丁二烯-苯乙烯共聚物（SBS）相比，它是一种价格低廉的沥青添加剂。然而，POE在高温储存期间容易在沥青中发生离析。将甲基丙烯酸缩水甘油酯（GMA）接枝到POE的分子主链上（即POE-GMA）可能会解决这个问题，因为GMA中的环氧基团可以与沥青中的活性基团发生反应。制备了线性和交联POE-GMA改性的沥青，并详细讨论了其热储存稳定性、物理性能和热氧化老化性能。结果表明，通过从宏观和微观角度测量软化点差异和小角X射线散射（SAXS）表征，线性和低度交联的POE-GMA改性沥青在高温下具有储存稳定性。在163℃烘箱中放置48小时后，改性沥青上下端的软化点差值（ΔSP）不超过3.5℃。更重要的是，通过常规物理性能、动态剪切流变仪（DSR）和多重应力蠕变恢复（MSCR）试验，POE-GMA的交联改性可以进一步提高软化点、降低针入度以及改善流变性能。此外，通过在旋转薄膜烘箱试验（RTFOT）后测量性能保留率和电子顺磁共振（EPR）表征，交联POE-GMA改性的沥青显示出更好的抗老化性能。这项工作可能为聚合物在沥青中的应用提供进一步的指导。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8e1/10574489/db3172b183cd/materials-16-06564-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8e1/10574489/3c379e9f3f34/materials-16-06564-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8e1/10574489/5e739ff294cb/materials-16-06564-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8e1/10574489/8980f7a69d83/materials-16-06564-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8e1/10574489/d0c0536b87eb/materials-16-06564-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8e1/10574489/34025ebdbc73/materials-16-06564-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d8e1/10574489/db3172b183cd/materials-16-06564-g010.jpg

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