Adhesion between polymer and dissimilar inorganic solids on a molecular scale strongly affects the performance of the polymer composite materials. Also, the adhesion between a functional polymer and an inorganic solid is expected to be a thin-film device. Thus, it is highly desired that the aggregation states and the thermal molecular motion at interfaces are understood. We here introduce the aggregation states and the thermal molecular motion of polymers examined by interface-sensitive spectroscopy and the related properties and functions.

In order to improve reliability in adhesion technologies, a precise control of fracture behaviors and adhesive properties of epoxy resins as well as the prediction of the dulability are strongly desired. To that end, it is necessary to obtain a better understanding of how the network formation and physical state change involved in the curing reaction affect the resultant network architecture and mechanical properties. In this comprehensive paper, we discuss on（i）control for a heterogeneiy in the curing process，（ii）effect of the heterogeniy on solvent cracking in a glassy state，（iii）effect of the cross-linking points in the network on the glass transition dynamics and time-temperature scaling.

Underwater adhesive materials are demand in various fields, such as biomedical applications. In nature, there are lots of aquatic livings having adhesive devices including suckers of a squid and an octopus. Herein, we had focused on a clingfish, which is widely known for using hierarchical sucker disk structures to demonstrate rapid and strong adhesion to rocky surfaces under strong currents. To investigate strong adhesion strength of a clingfish sucker disk, we had prepared mimicked structures with varying material parameters and measured its adhesion strength. The clingfish mimicked materials had successfully prepared by using anodic aluminum oxide as the mold for polystyrene or polyethylene nanofilaments and PDMS as the soft top layer. As the result of the adhesive force measurements of the prepared clingfish mimicked adhesive materials, it had revealed that the embedded nanofilament in soft materials enforces the adhesive force of the surface soft materials. Furthermore, the hardness and length of the nanofilaments, and the Young’s modulus and thickness of the mucus-mimicking PDMS layer had critical effects on the adhesion strength. According to the results, clingfish nanofilaments act as hard bracing for the soft mucus, and the structural combination of the conflicting characteristics of hardness and softness is crucial for strong adhesion.