6.polymer presentation
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pptTRANSCRIPT
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Polymer Modified Bitumen
Oscar Ellison
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Contents of presentation
• Why do we use polymers• What are polymers• History in NZ and internationally• Types and effects of different polymers• Thermoplastic
– Plastomer– Elastomer
• Thermoset and others• The future
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Why do we use polymers
• Increase demand from the road network• Search for new ideas and technologies• Polymers are an effective solution
What is required
• Enhance important properties of asphalt• Not detrimental to basic properties• Workable and able to process• Cost effective
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What are polymers
• Very large molecules
• Made up of smaller monomers
• Common both in nature and everyday life
• First synthetic polymers created around 1910
• Varying molecules and lengths
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The Chemistry: Styrene-butadiene
ButadieneC4H6
StyreneC6H5CH=CH2
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Use in New Zealand
• Natural Latex in sealing
• SBS, EVA and PBD in sealing
• SBS and EVA in asphalt
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Types of Polymer Used
Thermoplastic
Thermoset
Elastomers
Plastomers
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Elastomers
• Natural RubberLong flexible chains
• SBR (Styrene Butadiene Rubber)Random co-polymerHard styrene and rubbery butadieneBoth monomers compatible with bitumen
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SBS (Styrene Butadiene Styrene)
• Most commonly used polymer• Block co-polymer
• Entropic – structural• Enthalpic - energy
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Plastomers
• EVAEthylene Vinyl AcetateRandom co-polymer Not crossed-linked
Raises stiffness and toughness at low temperatures
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Thermoset
• Uncommon• Epoxy, Polyurethane• Once cured are not affected by temp• Difficult to handle• Created in situ – cross linked polymer network• Increased stiffness, rutting resistance, fuel resistance
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• Embrace the use of polymers• Sustainability etc. peak oil• Price of bitumen trending upwards need to find ways to
reduce cost. Polymers can do this. Thinner layers etc. • New polymers. New technologies for mixing.• New thinking…