SYNOPSISReactive liquid polymers ( RLP ) , carboxyl-terminated butadiene-acrylonitrile copolymers ( CTBN ) , epoxy-terminated butadiene-acrylonitrile copolymers (ETBN) , amine-terminated butadiene-acrylonitrile copolymers ( ATBN ) of different molecular weights (from 2200 to 6500 g/mol ) , and a nonfunctional butadiene-acrylonitrile copolymer were synthesized and characterized. Selection of end groups of RLPs and the synthesis were discussed. Phase behaviors of CTBN, ETBN, and NFBN in the RLP/DGEBA system were investigated regarding to the molecular weight, molecular weight distribution, chain composition, and end groups with a light transmission method. These experimentally determined phase behaviors will be related to those of the RLPs in the systems to be modified. The effect of molecular weight of RLP on the viscosity was also studied.
Elastomer-modified epoxy resins have grown in usage in the past 15 years in several application areas connected with structural adhesives, composites, civil engineering/construction, electrical laminates/ encapsulants and corrosion resistance. Some of this increased attention has come about through utility of telechelic butadiene/acrylonitrile liquid polymers. Both carboxyl and amine reactive liquid polymers (CTBN and ATBN) have provided chemistries amenable to this modification with the polybutadiene/acrylonitrile co polymer providing solubility parameters close to if not equaling those of base epoxy resins. It has only been within the last few years that similar elasto mer-modified epoxy resins have been examined in epoxy coatings and primers. This chapter reviews a portion of that relatively new journal and patent literature involving epoxy coal-tar, powder, photo-curable and solventless heavy duty coatings as well as metal primers. These examples are employed to illustrate such benefits of elastomer inclusion as reverse im pact, bending/crimping, corrosion resistance, ther mal shock resistance and coating adhesion. The chapter concludes with an initial reporting on in dustrial maintenance and marine coatings based on elastomer-modified epoxy resin models. Similar benefits are noted with these traditional solvent -based coatings under ambient cure.Numerous blends or alloys of thermosetting resins with elas tomers have been developed over the past four decades and found their way into continuing commercial use. A generous amount of this has been related to toughening needs : Overcoming the brittleness of highly crosslinked glassy polymers. With it came the recognition that not only was degree of elastomer/resin compati bility important but also the need for achieving a dispersed phase
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