Asphalt modified by thermoplastic elastomer based on recycled rubber

Wang, Shifeng; Wang, Qiang; Wu, Xiaoyu; Zhang, Yong

doi:10.1016/j.conbuildmat.2015.06.047

Cited by 72 publications

(18 citation statements)

References 23 publications

(31 reference statements)

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“…Dienes (e.g., butadiene and isoprene) are industrially important monomers in making rubbery materials for applications like gasket and automotive parts, gloves and footwear, sealants, impact modifiers, and asphalt modifiers . Poly(butadiene) and poly(isoprene) have low glass transition temperatures ( T g ) of −100 and −70 °C, respectively, and are copolymerized with monomers or blended with thermoplastic resins based on styrene and/or acrylonitrile to impart viscoelastic properties to the material .…”

Section: Introductionmentioning

confidence: 99%

Nitroxide‐Mediated Polymerization of Bio‐Based Farnesene with a Functionalized Methacrylate

Luk

Marić

2019

Macro Reaction Engineering

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polymers with controlled architectures. [11,12] Styrene-butadiene-styrene (SBS) and styrene-isoprene-styrene (SIS) triblock copolymers have long been commercialized too, such as the Kraton family of thermoplastic elastomers, which are made by anionic polymerization. [13,14] While many industrial applications use free radical polymerization, CRP precisely controls the molecular architecture of polymer chains, therefore making homopolymers, diblock and triblock copolymers with narrow molecular weight distributions (MWDs) and low dispersity. [15] Ionic polymerization is a truly "living" method, but it is intolerant to functional monomers and impurities. [16] CRP, more properly defined as reversible deactivation radical polymerization (RDRP), is a newer, more versatile technique to control the polymerization of free radicals. It utilizes activationdeactivation equilibrium or reversible chain transfer to suppress irreversible termination such that the propagating radical is primarily in its dormant state. [17] Amongst the several types of RDRP, atom transfer radical polymerization (ATRP) [18][19][20] and reversible additionfragmentation transfer (RAFT) [21][22][23] can polymerize a wide variety of functional monomers like vinyl esters and (meth) acrylates. This study will focus on nitroxide-mediated polymerization (NMP) as it is particularly adept for polymerization of styrene-diene systems. [24][25][26] NMP is able to polymerize functionalized styrene and acrylate monomers successfully, [27] however it is limited in its ability to maintain active chain ends in the polymerization of methacrylates. [28,29] It was discovered that the rate of dissociation (k d ) is very large because of steric stabilization of the propagating methacrylate radical, and the rate of combination (k c ) is very low due to steric hindrance provided by the bulky SG1-nitroxide (N-tert-butyl-N-[1-diethylphosphono-(2,2dimethylpropyl)] nitroxide). Consequently, the activationdeactivation equilibrium (K eq = k d /k c ) is high, resulting in termination by disproportionation. [30] To overcome this, small amounts of controlling comonomer like styrene or acrylonitrile can be added to effectively lower K eq . [28,31] Furthermore, the SG1-based nitroxide, BlocBuilder, can be modified with an N-succinimidyl ester group (N-succinimidyl modified commercial BlocBuilder [NHS-BB]) to better control the polymerization of methacrylates, [32] and successful polymerization of Nitroxide-Mediated Polymerization Farnesene (Far) is a bio-based terpene monomer that is similar in structure to commercially used dienes like butadiene and isoprene. Nitroxide-mediated polymerization (NMP) is adept for the polymerization of dienes, but not particularly effective at controlling the polymerization of methacrylates using commercial nitroxides. In this study, Far is statistically copolymerized with a functional methacrylate, glycidyl methacrylate (GMA), by NMP using N-succinimidyl modified commercial BlocBuilder (NHS-BB) initiator. Reactivity ratios are determined to be r Far = ...

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Section: Introductionmentioning

confidence: 99%

Nitroxide‐Mediated Polymerization of Bio‐Based Farnesene with a Functionalized Methacrylate

Luk

Marić

2019

Macro Reaction Engineering

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“…En una investigación orientada a la modificación de asfalto para pavimentos, se evaluó un sistema de polietileno lineal de baja densidad (LLDPE) con caucho reciclado triturado (CRT) [39], en el cual se realizó un proceso de desvulcanización dinámica del CRT durante el mezclado de ambos componentes en extrusora de doble husillo. Posteriormente, se des construcciones, es más fácil financiar los altos costos de este tipo de sistemas aislantes; sin embargo, los costos son inviables en el caso de construcciones livianas, por lo que conviene buscar materiales que desempeñen esa función con un menor impacto económico.…”

Section: Construcción E Infraestructuraunclassified

“…Ante esta dificultad, una alternativa es la modificación de la superficie de las partículas de CRT para crear puntos específicos de interacción entre las fases y así mejorar la transferencia de cargas desde la matriz hacia la fase de caucho, lo cual a su vez ayuda a optimizar algunas propiedades mecánicas. Estas modificaciones pueden obtenerse a través de medios físico-mecánicos o químicos, siendo la activación superficial, la desvulcanización, la vulcanización dinámica y la compatibilización algunos de los procesos más utilizados para este fin [39], [74] y [75].…”

Section: Materiales Compuestos De Matriz Polimérica Para Usos Diversosunclassified

Aplicaciones de caucho reciclado: Una revisión de la literatura

Arroyave

Restrepo

Vásquez

2017

Cien.Ing.Neogranadina

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La generación de residuos de caucho se ha convertido en una preocupación global por su impacto negativo en el medio ambiente y en la salud humana. La legislación ambiental sobre la disposición de este tipo de residuos ha venido aumentando las exigencias a los fabricantes, comercializadores y usuarios, con lo cual se ha acelerado la búsqueda de alternativas para el reaprovechamiento de los residuos de caucho. Este artículo presenta una revisión bibliográfica acerca de las principales tendencias en la utilización del caucho reciclado, incluyendo aplicaciones actualmente comercializadas y otras derivadas, tanto de estudios terminados, como de líneas de investigación en desarrollo. Las aplicaciones con mayor potencial de volumen consumido son del sector infraestructura y construcciones civiles, especialmente asfaltos, concretos y materiales aislantes para construcción liviana. Algunas aplicaciones con potencial en el futuro cercano son los filtros para la limpieza de aguas contaminadas y como componente en materiales compuestos con matriz termoplástica o en poliuretano. Por último, se evidencia la pertinencia de continuar investigando sobre esta temática que posee unos retos científicos de alta relevancia, los cuales ameritan la mayor atención por el problema ambiental significativo asociado al manejo de los residuos de caucho.

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“…In order to achieve these goals different researchers have focused on improving asphalt production technologies [2] or adding materials that can significantly improve asphalt binder performance [3], aiming also to increase sustainability of the production and construction processes [4]. Consequently, interesting studies and applications aimed to evalu-ate the performance of asphalt mixtures containing, for example, reclaimed asphalt materials [5,6], tire rubber [7][8][9][10], glass waste [11], or plastic materials [12][13][14][15][16][17] and other additives [18]. Among these solutions, the addition of polymeric materials may be very efficient.…”

Section: Introductionmentioning

confidence: 99%