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Toughened epoxy adhesive modified with acrylate based liquid rubber

✍ Scribed by Ratna, D; Banthia, Ajit K

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
258 KB
Volume
49
Category
Article
ISSN
0959-8103

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✦ Synopsis

The adhesive and mechanical properties of epoxy resins modi®ed with carboxyl terminated poly(2-ethylhexyl acrylate) (CTPEHA) liquid rubber have been investigated as a function of the concentration of liquid rubber. CTPEHA was synthesized by the bulk polymerization technique. CTPEHA oligomer was prereacted with the epoxy and the modi®ed epoxy networks were made by curing with an ambient temperature curing agent. The modi®ed epoxy networks were evaluated with respect to their adhesive and mechanical properties. The optimum properties were obtained at about 10±15 phr (phr stands for parts per hundred parts of epoxy resin) concentration of modi®er. Fracture surface analysis by optical microscopy (OM) indicates the presence of two phase microstructures.

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## Abstract Carboxyl‐terminated poly(2‐ethyl hexyl acrylate) (CTPEHA) having various molecular weights were synthesized by bulk polymerization in the form of liquid rubber. The liquid rubbers (LR‐1 to LR‐4) were characterized by ^13^C‐NMR spectroscopic analysis, nonaqueous titration, and vapor‐pres