OptimizingEpoxyToughness) with)GreaterFormulation ...October,2016 RAMSPEC 2 Contents •...
Transcript of OptimizingEpoxyToughness) with)GreaterFormulation ...October,2016 RAMSPEC 2 Contents •...
October, 2016 RAMSPEC 1
Optimizing Epoxy Toughness with Greater Formulation Latitude Using Reactive Liquid Polymers
Presented by: Erwin Wild
CVC Thermoset Specialties, An Emerald Performance Materials CompanyOctober, 2016
October, 2016 RAMSPEC 2
Contents
• Epoxy Toughening
• Epoxy Adduct Synthesis
• Glycidyl Ester Synthesis
• Adhesive Result Comparisons
• Conclusions
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Epoxy Applications
• Coatings • Composites
• Adhesives • Electrical Encapsulation
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Epoxy Properties
• High modulus
• High dimensional stability
• Good elevated temperature performance
• Chemical resistance
• Low creep
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How Reactive Liquid Polymers Work
• Copolymer is initially soluble in epoxy resin
• End group chemistry is chosen to react into matrix
• MW grows, RLP phase separates into micron sized domains
RLP MODIFIED
UNMODIFIED
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Epoxy Adduct Synthesis
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Disadvantages of Epoxy Adducts• Increase in viscosity
• Unreacted epoxy
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0 5 10 15 20
Viscosity
@ 27°C (cp)
phr RA1340
Viscosity of One Part Adhesivew/ 26% Acrylonitrile CTBN-‐Epoxy Adduct
October, 2016 RAMSPEC 10
Glycidyl Ester Synthesis
October, 2016 RAMSPEC 11
Epoxy Adhesive Formulations
• 100 parts epoxy (diglycidyl ether of bisphenol A – DGEBA)
• 5 parts dicyandiamide curative
• 2 parts urea accelerator
• 3 parts fumed silica
• Cured for 30 minutes at 177°C
• T-‐Peel and lap shear tested on electrogalvanized steel
• DSC tested at 10°C/min heated rate, Tg taken as midpoint
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Advantages of Glycidyl Esters• Minimal viscosity increase:
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18% Acrylonitrile ETBN 26% Acrylonitrile ETBN
Viscosity
@ 27°C (cp)
Adhesives Containing 15 phr ETBN
Glycidyl Ester
Adduct
Control w/o ETBN
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Adduct Chain Extension
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Glycidyl Ester of CTB
• Produces epoxy terminated polybutadiene without free epoxy, previously unachievable with traditional adduct synthesis
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Conclusions
• Glycidyl Esters of CTBNs are epoxy terminated RLP• With no free epoxy• With minimal viscosity impact to the formulation
• 18% Acrylonitrile Glycidyl ester performance • T-‐Peel equivalent to adduct at < 10 phr• Improved lap shear at < 15 phr• Less Tg decrease at 10-‐20 phr
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Conclusions Continued
• 26% Acrylonitrile Glycidyl ester performance • T-‐Peel slightly less than adduct, but still excellent toughening• Improved lap shear at all concentrations• Near equivalent Tg to adduct at all concentrations
• Polybutadiene glycidyl ester• Produces epoxy terminated polybutadiene directly• Application in systems compatible with polybutadiene
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Questions?