Reliability Analysis of Adhesive for PBT-Epoxy Interface
Date Published: 2007-04-16
Paper Number:2007-01-1517
DOI: 10.4271/2007-01-1517
Citation:
Kato, K., Aoki, T., Okamoto, Y., Tanaka, K. et al., "Reliability Analysis of Adhesive for PBT-Epoxy Interface," SAE Technical Paper 2007-01-1517, 2007, doi:10.4271/2007-01-1517.
Author(s):
Kazuo Kato - DENSO Corp.
Takashi Aoki - DENSO Corp.
Yasushi Okamoto - Japan Chemical Innovation Institute
Keiji Tanaka - Kyushu Univ.
Atsushi Takahara - Kyushu Univ.
PBT (polybutylene terephthalate) and epoxy adhesive, which both have superior heat resistance and environmental resistance, are a representative combination now being applied to many parts. Generally, PBT is annealed after molding at a temperature above the glass transition temperature to ensure dimensional stability when in use. But in this case, this process decreases the adhesive strength between PBT and epoxy. This study analyzes the adhesion degradation mechanism in this system and a countermeasure technology is proposed.
Regarding this PBT-epoxy adhesion degradation mechanism, focus is placed on changes in the fracture surface, which is analyzed before and after annealing. From this analysis it becomes clear that generation of a WBL (weak boundary layer) is caused by non-crystallization and a migration of the PBT functional group on the adhesion surface layer. According to this mechanism, it is clear that control of the functional group on the surface layer and reforming of a new functional group are very effective ways to maintain adhesive strength after annealing.
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