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Open AccessArticle

Hybrid Rubberised Bitumen from Reactive and Non-Reactive Ethylene Copolymers

Centro de Tecnología Repsol Ctra. De Extremadura, A-5, km 18, 28935 Móstoles, Spain
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
Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 1974;
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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