Preparation and Adhesive Property of One Component Epoxy Adhesives Chain extened by Polyurethanes Made from Polyoxypropylene Glycols

DOI Web Site

Bibliographic Information

Other Title
  • ポリオキシプロピレングリコールから成るポリウレタンで鎖延長した一液性エポキシ接着剤の調製と物'性

Description

Isocyanate-terminated　urethanes　with　polyoxypropylene　glycols　(PPGs)　as　a　softsegment　were　reacted　with　the　mixture　of　two　bisphenol-A type epoxy resins which had secondary hydroxy groups. One component epoxy adhesives were prepared with the epoxy resins chain extended by polyurethanes (PUs) and dicyandiamide as a hardener. The relationships between the properties of cured epoxy resins and molecular weight (MW) of PPGs in PUs were investigated. The MW of PPGs remarkably affected the adhesive properties and morphology. In case of PPG-Diol, the compatibilities of PPGs/epoxy resin decreased with the increasing MW of PPGs. The dynamic viscoelastic properties showed that the higher MW-PPGs were easy to form the phase separation structures. The adhesive strength about Diol-2000 type was the highest in all PPGs. The hydroxy group equivalent of PPGs was one of the most important factor about the compatibility between epoxy resin and PUs because of the similar properties of adhesive strength and morphology about Triol-3000 and Diol-2000 type.

Journal

Details 詳細情報について

Report a problem

Back to top