Microwave assisted fabrication of polymethyl methacrylate-graphene composite nanoparticles applied for the preparation of SBS modified asphalt with enhanced high temperature performance. (May 2020)

• Record Type: Journal Article
• Authors: Li, Jing; Duan, Shaochan; Muhammad, Yaseen; Yang, Jing; Meng, Fei; Zhu, Zhaorong; Liu, Yu
• Is Part Of: Polymer testing. Volume 85(2020)
• Publication Date: 2020-05
• Subjects: PMMA-GNPs added SBS modified asphalt -- DSR and MSCR test -- Nano-composite -- FTIR and XRD analyses; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2020.106388
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: In order to improve the high temperature rutting resistance ability and stability of styrene-butadiene-styrene (SBS) modified asphalt, microwave heating emulsion polymerization strategy was used to prepare polymethyl methacrylate (PMMA) and graphene nanoparticles (GNPs) composite (PMMA-GNPs) which was used to prepare PMMA-GNPs/SBS modified asphalt. Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and thermogravimetric analysis characterizations showed that PMMA-GNPs particles were successfully prepared having a weight ratio of GNPs: PMMA of 1:9. Microwave heating reduced the reaction time from 5 h to 30 min compared to conventional oil bath heating. Dynamic shear rheological test and multi-stress creep recovery test confirmed that 0.06% PMMA-GNPs/SBS modified asphalt (0.06% PMMA-GNPs of the mass of base asphalt) exhibited an increase of 14.2% in elastic modulus (G′), while rutting resistance was enhanced and sensitivity to stress changes was reduced as compared to those of 5% SBS modified asphalt. Fluorescence microscopy analysis and phase separation test revealed that an appropriate amount of PMMA-GNPs can be uniformly dispersed in SBS modified asphalt and enhance the mutual interaction of SBS with base asphalt. Based on the results of mechanical tests and characterizations, a suitable modification mechanism of PMMA-GNPs particles in the original SBS modified asphalt was described in detail. This study proposes a simple, cost effective and fast strategy for the preparation of PMMA-GNPs incorporated SBS modified asphalt and hence can be envisioned of great promise in construction and highway industries. Highlights: PMMA-GNPs were prepared by fast microwave heating emulsion-polymerization. PMMA-GNPs are core-shell enveloped. PMMA-GNPs/SBS asphalt showed improved rutting resistance. PMMA-GNPs improved the compatibility of SBS modified asphalt. Better molecular compatibility led to higher performance of PMMA-GNPs/SBS asphalt.