低エネルギー電子線を用いたポリアミド6（PA6）の表面改質による接着強度とその機構に関して検討を行った。本研究では，PA6に対する電子線処理により剥離強度は約8 倍に増加した。電子線処理後のPA6の表面物性，構造評価から，酸素含有極性官能基の導入だけでなく，ラジカル種が発生し，比較的長い寿命で存在していることが明らかとなった。このことから，電子線処理が静電的相互作用だけでなく，接着剤との化学結合の形成により接着強度が増大したものと考えられた。さらに長寿命ラジカルが存在し，処理効果の維持が数日間に亘り，可能であることが明らかになった。これらのことから，近年の装置技術の発展により，低電圧での電子線発生が可能となり，表面処理法の一つとして電子線照射処理を接着へ利用することの有用性を示すことができた。

This paper reviews the dynamical behavior of peeling adhesive tape from the viewpoint of complex system sciences, including morphology formation caused by large deformations of the adhesive. In particular with instability and nonlinearity as keywords, we explain formation of fibril structures at the peeling front of the tape and occurrence of stick-slip.

Interaction between polymers and flows is related to a lot of characteristic flow behaviors such as drag reduction, elastic instability and lubrication etc. It is therefore necessary to quantify this interaction in order to better understand the characteristic flows. We begin this review by overviewing some previous works focusing on a tethered polymer conformation in flows. Several types of conformation such as unperturbed state，trumpet regime and stem-and-flower regime are derived by considering force balance between stokes drag due to polymer and elastic force of polymers. However, in the case of synthetic polymers, effects of flows on the polymer and its conformation in flows are not experimentally measured. Therefore, we have tried to measure drag force of synthetic polymers in flows to derive the interaction. We proposed a method to measure the drag force of methoxy polyethyleneglycol thiol（mPEG-SH） as a synthetic polymer in flowing fluids by using a scanning probe microscope （SPM）． The drag force of mPEG-SH was affected by the molecular weights of mPEG-SH and solute in the flows. To determine the drag force, we proposed a stem and ellipsoidal-flower model. The model was used to calculate the drag force by predicting the polymer conformation, which was reasonably close to the drag force measured by experiments.

Although all the isotopes of bismuth are radioactive, the most abundant 209Bi can serve as a stable isotope owing to its very long half-life. Bismuth is an attractive heavy element for inorganic components of organic–inorganic hybrid materials. As an element, bismuth exhibits unique features such as high atomic refractivity, X-ray shielding property, and heavy atom effect. Furthermore, typical bismuth compounds are less toxic and inexpensive. However, appropriate molecular designs are necessary for the synthesis of bismuth-containing polymers with sufficient stability, as typical Bi–C bonds are weak. In this review, we survey research on the synthesis of functional bismuth-containing polymers. These bismuth-containing polymers exhibit excellent and unique properties such as high refractive index, X-ray shielding property, and phosphorescence.