Polyamide6（PA6）is one of the engineering plastics with high thermal stability, wearable durability and mechanical properties and is a polymer matrix in carbon fiber reinforced plastics. Therefore, in the manufacturing, the adhesion of PA6 materials is significant. For the high adhesion properties of PA6, various surface modification methods have been investigated. Recently, low energy electron beam irradiation method has been developed as a surface treatment method. Herein, we focused on the surface modification and adhesion properties of PA6 substrates using low energy electron beam. The PA6 substrates were adhered with secondgeneration acrylic adhesive after irradiation of electron beam. The adhesion strength was increased, relative to that without any treatment. In the PA6 substrates irradiated electron beam（EB-PA6），the oxygen-containing functional groups was introduced and radical species were generated. The electron beam was achieved to deeper region from the surface of EB-PA6. In addition, adhesion properties of EB-PA6 was kept for more than 7 days. The electron beam irradiation has a large effect on the improvements of adhesion properties of polyamide 6.

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.