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Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures

The anti-cracking properties of polymer-modified asphalt depend largely on the molecular structure of the polymer modifier. However, the mysterious structure-performance relationship is still elusive. In this paper, three kinds of polymers with different chain structures were selected to address thi...

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Autores principales: Wang, Peng, Shi, Fu-quan, Liu, Xi-yin, Ren, Rui-bo, Zhu, Ying, Sun, Hui, Zheng, Guang-shun, Dong, Ze-jiao, Wang, Li-zhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6960999/
https://www.ncbi.nlm.nih.gov/pubmed/31817766
http://dx.doi.org/10.3390/polym11122025
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author Wang, Peng
Shi, Fu-quan
Liu, Xi-yin
Ren, Rui-bo
Zhu, Ying
Sun, Hui
Zheng, Guang-shun
Dong, Ze-jiao
Wang, Li-zhi
author_facet Wang, Peng
Shi, Fu-quan
Liu, Xi-yin
Ren, Rui-bo
Zhu, Ying
Sun, Hui
Zheng, Guang-shun
Dong, Ze-jiao
Wang, Li-zhi
author_sort Wang, Peng
collection PubMed
description The anti-cracking properties of polymer-modified asphalt depend largely on the molecular structure of the polymer modifier. However, the mysterious structure-performance relationship is still elusive. In this paper, three kinds of polymers with different chain structures were selected to address this issue. The indices of styrene, trans-butadiene, aliphatic branched-chain, and aliphatic long-chain from the infrared spectrum were used to quantify the functional group compositions of polymer modifiers. Viscoelastic parameters, including relaxation time, dissipation energy ratios, and stiffness were assessed to illustrate the anti-cracking properties of polymer-modified asphalt. Results showed that relaxation time and dissipation energy ratios were mainly determined by the polymer network strength, molecular size, aliphatic chain feature, and the orientations speed of aliphatic chains. The short relaxation time and high dissipation ratio lead to the low stiffness and favorable low-temperature performance of asphalt. The improvement of these performances requires a polymer with high indices of an aliphatic long-chain, styrene, aliphatic branched-chain, and trans-butadiene, respectively. An aliphatic-long chain, aliphatic branched-chain, and trans-butadiene were soft segments in asphalt while styrene was the rigid segment. The soft segments affect the intramolecular friction, orientation, and thermal motion at low temperatures, whereas the rigid segment enhances the strength of polymer networks. Thus, the anti-cracking property of polymer-modified asphalt can be improved by adjusting the ratio of soft and rigid segments in the polymer modifier.
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spelling pubmed-69609992020-01-24 Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures Wang, Peng Shi, Fu-quan Liu, Xi-yin Ren, Rui-bo Zhu, Ying Sun, Hui Zheng, Guang-shun Dong, Ze-jiao Wang, Li-zhi Polymers (Basel) Article The anti-cracking properties of polymer-modified asphalt depend largely on the molecular structure of the polymer modifier. However, the mysterious structure-performance relationship is still elusive. In this paper, three kinds of polymers with different chain structures were selected to address this issue. The indices of styrene, trans-butadiene, aliphatic branched-chain, and aliphatic long-chain from the infrared spectrum were used to quantify the functional group compositions of polymer modifiers. Viscoelastic parameters, including relaxation time, dissipation energy ratios, and stiffness were assessed to illustrate the anti-cracking properties of polymer-modified asphalt. Results showed that relaxation time and dissipation energy ratios were mainly determined by the polymer network strength, molecular size, aliphatic chain feature, and the orientations speed of aliphatic chains. The short relaxation time and high dissipation ratio lead to the low stiffness and favorable low-temperature performance of asphalt. The improvement of these performances requires a polymer with high indices of an aliphatic long-chain, styrene, aliphatic branched-chain, and trans-butadiene, respectively. An aliphatic-long chain, aliphatic branched-chain, and trans-butadiene were soft segments in asphalt while styrene was the rigid segment. The soft segments affect the intramolecular friction, orientation, and thermal motion at low temperatures, whereas the rigid segment enhances the strength of polymer networks. Thus, the anti-cracking property of polymer-modified asphalt can be improved by adjusting the ratio of soft and rigid segments in the polymer modifier. MDPI 2019-12-06 /pmc/articles/PMC6960999/ /pubmed/31817766 http://dx.doi.org/10.3390/polym11122025 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Peng
Shi, Fu-quan
Liu, Xi-yin
Ren, Rui-bo
Zhu, Ying
Sun, Hui
Zheng, Guang-shun
Dong, Ze-jiao
Wang, Li-zhi
Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures
title Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures
title_full Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures
title_fullStr Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures
title_full_unstemmed Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures
title_short Role of Aliphatic Chain Characteristics on the Anti-Cracking Properties of Polymer-Modified Asphalt at Low Temperatures
title_sort role of aliphatic chain characteristics on the anti-cracking properties of polymer-modified asphalt at low temperatures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6960999/
https://www.ncbi.nlm.nih.gov/pubmed/31817766
http://dx.doi.org/10.3390/polym11122025
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