Compatibilizer in waste tire powder and low‐density polyethylene blends and the blends modified asphalt

Abstract

With the increasing ratio of waste tire powder (WTP) to low-density polyethylene (LDPE), the hardness and tensile strength of the WTP/LDPE blends decreased while the elongation at break increased. Five kinds of compatibilizers, such as maleic anhydride-grafted polyethylene (PE-g-MA), maleic anhydride-grafted ethylene-octene copolymer (POE-g-MA), maleic anhydridegrafted linear LDPE, maleic anhydride-grafted ethylene vinyl-acetate copolymer, and maleic anhydride-grafted styrene-ethylene-butylene-styrene, were incorporated to prepare WTP/LDPE blends, respectively. PE-g-MA and POE-g-MA reinforced the tensile stress and toughness of the blends. The toughness value of POE-g-MA incorporating blends was the highest, reached to 2032.3 MJ/m 3 , while that of the control was only 1402.9 MJ/m 3 . Therefore, POE-g-MA was selected as asphalt modifier. The toughness value reached to the highest level when the content of POE-g-MA was about 8%. Besides that the softening point of the modified asphalt would be higher than 60 C, whereas the content of WTP/LDPE blend was more than 5%, and the blends were mixed by stirring under the shearing speed of 3000 rpm for 20 min. Especially, when the blend content was 8.5%, the softening point arrived at 82 C, contributing to asphalt strength and elastic properties in a wide range of temperature. In addition, the swelling property of POE-g-MA/WTP/LDPE blend was better than that of the other compalibitizers, which indicated that POE-g-MA /WTP/ LDPE blend was much compatible with asphalt. Also, the excellent compatibility would result in the good mechanical and processing properties of the modified asphalt.

Rheological properties of asphalts modified by waste tire rubber and reclaimed low density polyethylene

“…There are already several studies concerning the compound modification of asphalt using the combination of rubber and PE in road and roofing applications [10,12,18]. In these studies, the effects of rubber and PE are combined, resulting in enhanced high temperature properties compared to single modified asphalts and improved low temperature properties compared to polyethylene modified asphalts.…”

Development and characterization of post-consumer rubber tire powder, high density polyethylene and ethylene-octene-1copolymer ternary mixtures

“…Although this scenario has benefited tire manufacturers, it has also led to extensive environmental littering and its consequent impacts [1][2][3] . This type of waste disposal represents three significant risks: high probability of burning due to the presence of flammable oils in tire composition; the presence of toxic chemicals that can undergo leaching, which causes groundwater contamination; and depending on how they are discarded, scrap tires can accumulate rainwater, thus serving as breeding sites for disease-carrying insects [4] .…”

“…This is considered an interesting strategy for reusing this waste because the process is relatively simple and involves only mechanical mixing [9,10] . However, the incorporation of rubber tire powder (RTP) can result in materials with poor mechanical properties due to the lack of interfacial adhesion between polymer and RTP [9][10][11][12] . Several techniques are employed to improve the interfacial properties between these components: partial devulcanization of rubber tire, treatment with peroxides to create reactive sites in the RTP surface, functionalization of the waste tire rubber, and the addition of non-reactive copolymers with chemical affinity with composite components [9,[13][14][15][16][17] .…”

“…To improve the interaction between the phases in LDPE and RTP, Ouyang et al [12] studied several compatibilizers. The mechanical properties were improved with maleic anhydride grafted polyethylene (PE-g-MA) and grafted ethylene-octene-1 copolymer (POE-g-MA) as compatibilizers.…”

Waste Tire as an Asphalt Cement Modifier for Road Pavement

“…Waste tire can be incorporated into asphalt paving mixes using two different methods, which are referred to as the wet process and the dry process [10,14]. In the wet process, crumb rubber acts as an asphalt cement modifier, while in the dry process, granulated or ground rubber and/or crumb rubber is used as a portion of the fine aggregate [11,14].…”