Magnetic resonance imaging（ MRI） is one of the most popular molecular imaging methods especially in medical fields. As well as nondestructive monitoring of a sample, MRI enables to visualize the molecular mobility of a sample using magnetic resonance（ MR） parameters, including T₂ relaxation time and apparent diffusion coefficient（ ADC）. From this perspective, the present study demonstrated the applicability of magnetic resonance imaging for evaluation of the dispersion state of nanoparticles（ NPs） in concentrated suspensions. Titanium dioxide（ TiO₂） 15-nm-diameter NPs, for use in sunscreen lotion products, were examined as a test NP. As a result of the series of experiments, the MRI technique was proven to have a great capacity to visualize the slight change in dispersion state which is not detectable by the visible observation. Thus, this study succeeded in offering a new approach: that of nondestructive monitoring of the dispersion stability of NPs in concentrated suspensions. In the next phase of this study, we expanded the applicability of the MRI technique to the evaluation of emulsion state. Emulsions, for use in milky lotion and skin cream, were employed as test samples, and then their creaming behaviors were monitored by T₂ and ADC maps. From the findings, it was confirmed that MRI was also powerful for monitoring the emulsion state of pharmaceutical emulsions. In conclusion, MRI is a promising tool for evaluation of dispersion states of suspensions and emulsions.

Adhesion strength of PSA tapes is usually evaluated by the peel test, but it is still unclear how it is affected by thickness of the PSA layer and the backing substrate. One effective approach is to focus PSA layer on the release process from the initiation of the deformation to separation of the elongated fibrils because the measured peel force is the resultant of release forces distributed along the curved backing substrate. It has been known that the maximum release force is located at the early stage of the release process, followed by the sharp decrease and plateau until complete separation. It is interesting to note that this transition of release force in the peel test is very similar to force curve measured by the probe tack test. In other words, the maximum release force on release process by the peel test could be directly measured the by probe tack test. Therefore, it is necessary to establish the relationship between these forces for generalized quantitative definition of the adhesion strength. This review introduces the resultant release force and the local maximum release force individually evaluated by the peel test and probe tack test with consideration of the thickness of PSA layer and backing substrate.

Multilayer films, which combine polyethylene layer and polyamide layer are frequently used to wrap food in. However, the material recycling of this film is commercially less interesting because the direct melting process ing of the film leads to the immiscible and incompatible polymeric blends. In this study, mechanical properties of the blends of linear low-density polyethylene（ LLDPE） and polyamide 6（ PA6） which were model blends of the multilayer films and incorporation of maleic anhydride grafted polypropylene（ MPP） as compatibilizer were investigated. PA6 particles dispersed in LLDPE increased modulus, decreased impact strength and did not vary tensile yield stress. Incorporation of MPP increased impact strength significantly, because the MPP minimized significantly the PA 6 particles in the blends. However, the incorporation of MPP did not vary mod ulus and tensile yield stress. Incorporation of MPP as compatibilizer to LLDPE / PA6 blends was an excellent method which realize both high modulus and high impact strength.

Multi-walled carbon nanotube（ MWCNT）-polymer nanocomposites are attracting great attention because of their ability to form conducting networks, which is attributed to their high aspect ratios. We investigated the factors that affect MWCNT dispersibility and electro conductivity of Pressure sensitive adhesive（ PSA） in order to design conductive PSAs using MWCNT. The surface free energy of PSAs greatly influenced on the MWCNT dispersibility and conductivity of the conductive PSAs. The smaller interaction between PSA and MWCNT induced the formation of more conductive network by MWCNT agglomerates and provides higher conductive composites with low MWCNT loading. Also, we investigated the influence of the kind and quantity of added tackifier（ TF） on the phase structure and electrical conductivity of polyurethane（ PU） PSAs containing MWCNT. When TF having low compatibility with PU was incorporated, sea-island structure was formed. In the case of higher TF content, the sea component was composed of TF having high affinity MWCNT. As a result, dispersibility of MWCNT and conductivity of the composite were enhanced. Based on our results, we designed highly conductive PSAs by adding MWCNT to silylated urethane PSAs.