Compatibility between TPU and asphalt in TPU modified asphalt based on molecular dynamics

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  • (1.College of Transportation Engineering Dalian Maritime University, Dalian 116026, China;2. School of Transportation and Geomatics Engineering Shenyang Jianzhu University, Shenyang 110168, China)

Received date: 2023-03-13

  Revised date: 2023-04-06

  Accepted date: 2023-04-06

  Online published: 2023-04-06

Abstract

In order to investigate compatibility between thermoplastic polyurethane elastomer (TPU) and asphalt in TPU modified asphalt, a twelve-molecule model represented by four components of asphalt and a molecular model represented by TPU were constructed by using Materials Studio 2020 molecular simulation software, and the asphalt molecular model was further optimized based on the four-component test of asphalt, and the optimized molecular model was assembled to construct a TPU asphalt blending model. The compatibility of TPU and asphalt in the TPU modified asphalt blending model under different temperature conditions was analyzed by using solubility parameters, molecular potential energy and diffusion coefficient, and verified by fluorescence microscopy tests. The results show that TPU has the best compatibility with various components of asphalt at 160 ℃, especially with aromatic fraction and gum. The interaction between aromatic fraction and TPU can improve the compatibility between TPU and asphalt, thereby inhibiting the diffusion of aromatic fraction. At 160 ℃, TPU is more uniformly distributed in asphalt, and as result the best compatibility with asphalt. 

Cite this article

GUO Naisheng, LÜ Xin, JIN Xin, YU Ankang, FANG Chenze, CHU Zhaoyang . Compatibility between TPU and asphalt in TPU modified asphalt based on molecular dynamics[J]. Journal of Dalian Maritime University, 2023 , 49(3) : 129 -137 . DOI: 10.16411/j.cnki.issn1006-7736.2023.03.014

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