Cured blends of epoxy resin/high molecular weight phenoxy resin containing phosphorus（P PR（H）） showed the best flow properties with maintaining good resistant reliability and good peel strength.Increase of molecular weight of the phenoxy resin containing phosphorus could cause these improvements and then the best resin blends for halogen free FPC adhesives were prepared.

It is known that interfacial debonding between the fiber and matrix is a major mechanism regarding toughness improvement of ceramic matrix composites（CMC）. In this study, a new finite element（FE） model considering fiber/matrix debonding of CMC was proposed. In this model, equality of nodal displacements at the interface and equilibrium of contact forces are assumed as contact conditions.As an advantage, the numerical solutions can be obtained by only one calculation without iterative algorism, which has been performed in contact problems. The present model was formulated for the cases that（ⅰ）Coulomb friction occurs as an nterfacial frictional force, and（ⅱ）a constant nterfacial shear stress works. The obtained numerical results were compared with the theoretical interfacial debonding models. Results show that the numerical results in fiber and matrix stress distributions agree well with those of the theoretical models Furthermore, we deled the formulation of cohesive element（one of finite elements simulating interfacial amage）by assuming a proportional relation between the contact force and relative displacement at the interface. The obtained results edicted qualitatively actual behavior in the fiber and matrix stress distributions at the debonding region.

Peeling behavior of polyacrylic block copolymer and crosslinked polyacrylic copolymer containing acrylic acid during probe tack test was observed using a high speed microscope. As a result, three different peeling patterns were observed: Peeling progressed linearly from the edge to the center of the probe without cavitation（A）, peeling progressed from the edge to the center of the probe with cavitation（B）and cavitation occurred in the entire adhesive layer, and peeling initiation was delayed （C）. Tack was higher in the order of C＞B＞A. The stringiness during 90°peel test was observed for crosslinked polyacrylic copolymer with various crosslinking degrees. All observed stringiness were sawtooth shaped, however the frame formed at the peeling front in the case of middle crosslinking degree. When the front frame formed, the peel strength was higher. It was found that the cavity formation and the sawtooth shaped stringiness with front frame are caused by the internal deformation of adhesive layer preferentially over peeling. Then these phenomena delayed peeling by the strain energy dissipation with the deformation of adhesive layer.