NDLI: Thermal and dynamic mechanical properties of blends of bitumen with metallocene catalyzed polyolefins

Content Provider	Springer Nature Link
Author	Spadaro, Chiara Plummer, Christopher J. G. Månson, Jan Anders E.
Copyright Year	2011
Abstract	A high penetration grade bitumen has been blended with up to 50 wt% of two different grades of metallocene catalyzed linear low density polyethylene (m-LLDPE) in order to investigate the potential of these and similar copolymers as a substitute for styrene butadiene styrene triblock copolymers in polymer-modified bitumens (PMB). A continuous polymer-rich phase was observed at m-LLDPE contents as low as 5–10 wt%, along with a significant decrease in the effective glass transition temperature of the PMBs with increasing polymer concentration, suggesting benefits for low temperature flexibility. The m-LLDPE-based PMBs also showed relatively low dynamic shear viscosities up to high polymer contents in the range of temperature and shear rate corresponding to typical PMB processing conditions. However, the presence of bitumen in the m-LLDPE-rich phase led to a significant reduction in the melting points of the m-LLDPE, and softening of the PMBs at temperatures as low as 40–50 °C, depending on the composition and the melting point of the pure polymer. PMBs based on the m-LLDPE with the higher melting point remained fully elastic in this temperature range, but at the expense of increased crystallinity and a higher glass transition temperature, which limit improvements in low temperature flexibility. On the other hand, the potentially broad composition and property windows associated with m-LLDPEs suggest considerable scope for the fine tuning of PMB properties by using combinations of different m-LLDPEs and/or other polyolefins as a means to optimize performance.
Starting Page	7449
Ending Page	7458
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	46
Issue Number	23
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2011-06-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Polymer Sciences Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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