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Plastomer
About: Plastomer is a research topic. Over the lifetime, 388 publications have been published within this topic receiving 4160 citations.
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TL;DR: In this article, a 50/70 penetration grade base bitumen has been mixed with plastomeric polymers at different proportions by means of a high shear laboratory type mixer, and the properties and microstructure of the samples have been determined and characterized using conventional and empirical test methods and fluorescence microscopy respectively.
55 citations
TL;DR: In this paper, an elastomer (radial styrene butadiene styrene, SBS) and a plastomer polymer (ethyl vinyl acetate, EVA) were mixed with one base bitumen at three polymer concentrations to investigate the changes in the morphology and rheological response of polymer modified bitumens used in road pavement construction caused by ageing.
Abstract: Polymer additives are used to improve the properties of road bitumens including their oxidative resistance. However, their usage as anti-oxidative materials remains relatively unclear. This study aims to investigate the changes in the morphology and the rheological response of polymer modified bitumens used in road pavement construction caused by ageing. An elastomer (radial styrene butadiene styrene, SBS) and a plastomer (ethyl vinyl acetate, EVA) polymer were mixed with one base bitumen at three polymer concentrations. The bitumens were RTFO and PAV aged. The morphology of the bitumens was captured by fluorescence microscopy while the rheological properties were measured by means of the multiple stress creep and recovery (MSCR) test. The results show that the morphology of the SBS modified bitumen degrades with ageing as a function of polymer concentration and dispersion, with higher dispersion being more resistant. The morphology of the EVA modified bitumen has a low ageing susceptibility irrespective of polymer concentration. The MSCR response of EVA modified bitumens does not differ from that found for unmodified bitumen, where the hardening produces a decrease in the non-recoverable compliance. In the case of SBS modified bitumen, the degradation of the polymer backbone affects the bitumen hardening as much as the polymer phase dispersed and networked in the bitumen phase. Furthermore, in the case of the elastomer, the average percent recovery is in agreement with the variation of the morphology with ageing. Therefore, the use of the average percent recovery as a valuable rheological index of the integrity of the polymer network can be advocated.
55 citations
TL;DR: In this paper, the α-relaxation originates from the interface between crystal lamellae and amorphous interlamellar regions, and the activation energies of this relaxation were found to decrease with increasing crystallinity.
53 citations
Patent•
14 Feb 2002
TL;DR: In this paper, the authors proposed a heterophasic propylene polymer composition comprising the following components: i) 60 to 90 % wt, relative to the total weight of components i), ii) and iii), of an elastomer; and ii) 5 to 25 % wT, relative with the total amount of components.
Abstract: The invnetion provides a heterophasic propylene polymer composition comprising the following components: i) 60 to 90 % wt, relative to the total weight of components i), ii) and iii), of a propylene polymer matrix comprising a propylene homopolymer and, optionally a propylene copolymer, said propylene polymer matrix having an ethylene content of no more then 5 % wt; ii) 5 to 30 % wt, relative to the total weight of components i), ii) and iii), of an elastomer; and iii) 5 to 25 % wt, relative to the total weight of components i), ii) and iii), of an ethylene copolymer plastomer having a density of not more than 910 kg/m3 and a melt flow rate MFR?2.16? (190 °C) of at least 0.5 g/10 minutes at 190 °C under a weight of 2.16 kg.
53 citations
TL;DR: In this article, the benefits obtained from the addition of small quantities of chlorinated polyolefins to paving grade asphalt binders were investigated, which resulted in significant improvements over conventional modifiers at both the high and low temperature extremes.
Abstract: SYNOPSIS The benefits obtained from the addition of small quantities of chlorinated polyolefins to paving grade asphalt binders were investigated. A chlorinated polyethylene plastomer, Tyrin 2552, and a chlorinated olefinic elastomer, Tyrin CM0730, were added to asphalt binders at 3 and 5 wt % and subsequently reactively processed to facilitate compatibilization. The mixtures were analyzed for rheological performance relating to fatigue and rutting as well as low-temperature fracture performance. The addition of small quantities of these polymers to the asphalt binders resulted in significant improvements over conventional modifiers at both the high and low temperature extremes. 0 1994 John Wiley & Sons, Inc.
52 citations