The impact of terminal and polymer backbone functionality on toughener effectiveness from the standpoint of glass transition temperature, and adhesive and structural properties were examined. Internal functionality included polybutadiene, polybutadiene/acrylonitrile, polyether, polyester and polyacrylate. Terminal functionality included Bis-A epoxy adducts, glycidyl esters and ethers, carboxylates and alcohols. Data shows that both internal and terminal functionalities have a dramatic affect on all properties tested. Glycidated materials gave the overall better performance.
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