Blends of bitumen with various polyolefins

Fawcett, Allan H.; McNally, Tony

doi:10.1016/s0032-3861(99)00733-8

Cited by 85 publications

(70 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For these amorphous rubbers, DSC scans did not detect any transitions caused by melting of polymer crystallites in the blends, in contrast to the behavior of many bitumen-polyolefin systems. 10,17 Any mechanical property is thus derived chiefly from the bitumen-rich phase. The bending modulus was at least 10 9 Pa at low temperatures for all but the poly(cis-butadiene), chlorinated polyethylene, and Lycra blends.…”

Section: Discussionmentioning

confidence: 99%

A dynamic mechanical and thermal study of various rubber-bitumen blends

Fawcett

McNally

2000

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

Blends of a Nynas 100 penetration-grade bitumen with a cis-polybutadiene, a butyl rubber, three polyisobutylenes of different molecular weights, a chlorinatedpolyethylene, polychloroprene in latex form, and a polyurethane rubber (scrap Lycra) were prepared using a Z-blade masticator mixer at a temperature of about 180°C. The blends contained between 10 and 40 pph (i.e., 9 and 29%) by weight of rubber. They were characterized by fluorescence optical microscopy, differential scanning calorimetry, and dynamic mechanical thermal analysis. The bitumen-rich phases provided the matrix in most of these systems, polymer-rich extensive phases being formed with butyl rubber, and low-and moderate-molecular-weight poly(isobutylenes) when the proportion rose above 30 pph, and for the poly(cis-butadiene) and chlorinated polyethylene system only when the proportion rose above 40 pph, according to the tan ␦ plots. Only glass transitions were associated with polymer-rich phases, and there were some melting transitions from paraffinic wax components ejected from the bitumen-rich phases. Below room temperature the modulus of blends of polybutadiene, chlorinated polyethylene, and the polyurethane rubber were similar to that of the bitumen; but those of the other polymers were stiffer by a factor of 50, perhaps because of a rearrangement of the asphaltenes. The softer blends, particularly the first two named above, had loss processes (with tan ␦ Ͼ 0.5) ranging over 200°C or more.

show abstract

Section: Discussionmentioning

confidence: 99%

A dynamic mechanical and thermal study of various rubber-bitumen blends

Fawcett

McNally

2000

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

show abstract

“…1−3 For the first requirement we have used a poly(cisbutadiene) (PBD), a chlorinated polyethylene (CPE), and a polyurethane (PU), each of which have been found, 4,5 when used individually, to produce blends with low temperature properties that are close to those provided by a frequently used additive, atactic polypropylene (APP) 2,4,6 with the bitumen we use. For the second effect we have included a proportion of a polyolefin, studies of which have shown them to crystallize from blends when cooled.…”

mentioning

confidence: 99%

An attempt at engineering the bulk properties of blends of a bitumen with polymers

2002

View full text Add to dashboard Cite

ABSTRACT:We have taken blends of a bitumen with three homopolymers that produce systems softer than the bitumen, and to each have added small quantities of different semicrystalline polyolefins. The intention is to discover whether these will form an extensive network system within a blend with a low T g in which crystallites create the cross-links, as may happen with the isotactic polypropylene present in some atactic polypropylene systems. Such thermoplastic cross-links might provide a useful feature for certain uses, such as in built-up roofing membranes. These were found only within one blend based upon the polybutadiene, in two blends based upon chlorinated polyethylene, but in none based on the Lycra R , whose blends with LLDPEs and the HDPE flowed below the crystal melting temperature. The E plots indicate the presence of many loss processes within the blends at low temperatures: the tan δ plots show other processes active up to 200• C within the soft matter. The behavior we discovered suggests that the properties of binary polymer blends are not associated solely with the components, but that, when the material is stiff or after

show abstract

“…paraffinic and aromatic compounds). Thus, their inclusion in the polymer-rich phase prevents the formation of larger crystallites and, as observed for EVA-VA18, yields an eventual broader size distribution (or broader melting peak) [29][30]. In consequence, the decrease in the EVA melting points after its blending with bitumen would result from the presence of crystallites with smaller size.…”

Section: Effect Of Vinyl Acetate Contentmentioning

confidence: 94%

Influence of polymer melting point and Melt Flow Index on the performance of ethylene-vinyl-acetate modified bitumen for reduced-temperature application

Yuliestyan¹,

Cuadri²,

García‐Morales³

et al. 2016

Materials & Design

View full text Add to dashboard Cite

The paving industry is currently demanding polymer modified bitumens (PMBs) with enhanced in-service performance and low enough viscosity at lower application temperatures. With this aim, this study focuses on the use of ethylene vinyl acetate (EVA) copolymers with low melting temperatures and explores the effect on the desired properties of the vinyl acetate (VA) content and Melt Flow Index (MFI). To that end, binders were prepared from EVA copolymers having varying VA contents from 7 to 33 wt.%, and MFI from 2 to 800. A comprehensive characterization based on viscous flow curves, dynamic shear temperature sweeps, standardized technological tests, differential scanning calorimetry (DSC) and optical microscopy analysis was conducted on EVAbinders with 5 and 7.5 wt.% EVA. Low VA contents proved to endow bitumen with improved performance at medium-high in-service temperatures. Interestingly, binder viscosity at 135ºC decreased with increasing the MFI, regardless the selected VA content.This means that tailored PMBs can be designed with both improved in-service performance at medium-high temperatures and reduced viscosity to facilitate polymerbitumen mixing, mineral coating and asphalt mix laydown/compaction at lower temperatures.

show abstract

Blends of bitumen with various polyolefins

Cited by 85 publications

References 10 publications

A dynamic mechanical and thermal study of various rubber-bitumen blends

A dynamic mechanical and thermal study of various rubber-bitumen blends

An attempt at engineering the bulk properties of blends of a bitumen with polymers

Influence of polymer melting point and Melt Flow Index on the performance of ethylene-vinyl-acetate modified bitumen for reduced-temperature application

Contact Info

Product

Resources

About