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Open AccessArticle

Hybrid Rubberised Bitumen from Reactive and Non-Reactive Ethylene Copolymers

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Centro de Tecnología Repsol Ctra. De Extremadura, A-5, km 18, 28935 Móstoles, Spain
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Centro de Investigación en Tecnología de Productos y Procesos Químicos (Pro2TecS), Departamento de Ingeniería Química, Escuela Técnica Superior de Ingeniería, Universidad de Huelva21071, Campus del Carmen, 21007 Huelva, Spain
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Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 1974; https://doi.org/10.3390/polym11121974
Received: 31 October 2019 / Revised: 26 November 2019 / Accepted: 28 November 2019 / Published: 30 November 2019
Hybrid modification is a relatively new concept of incorporating two or more polymeric modifiers of different nature to a bitumen, in order to take advantage of their complementary features. Aiming to this, in this paper, the so-called Hybrid Systems (HSs) were prepared by the addition of an ethylene-based copolymer (reactive or non-reactive) to a model rubberised binder (Crumb Tyre Rubber Modified Bitumen). The resulting binders (referred to as reactive and non-reactivate HSs, depending on copolymer used) were evaluated by means of thermorheological analysis, technological characterisation, fluorescence microscopy and modulated differential scanning calorimetry. From the experimental results, it may be deduced a positive synergistic effect of non-dissolved Crumb Tyre Rubber (CTR) particles and a second polymeric phase that not only improves the in-service performance but also the high-temperature storage stability. This enhancement is attributed to the development of a multiphasic system composed of non-dissolved CTR particles, a polymer-rich phase and an asphaltene-rich phase. In the case of non-reactive HSs, droplets of swollen ethylene copolymer form a well-defined dispersed phase. By contrast, reactive HSs display a different morphology, almost invisible by optical microscopy, related to the development of a chemical network that yields, by far, the highest degree of modification. View Full-Text
Keywords: bitumen; tyre rubber; stability; ethylene copolymers; reactive polymers bitumen; tyre rubber; stability; ethylene copolymers; reactive polymers
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MDPI and ACS Style

Senise, S.; Carrera, V.; Cuadri, A.A.; Navarro, F.J.; Partal, P. Hybrid Rubberised Bitumen from Reactive and Non-Reactive Ethylene Copolymers. Polymers 2019, 11, 1974.

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