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.

ポリエチレン（ PE） とポリアミド（ PA） を含む積層フィルムが食品包装用に用いられている。しかし，この積層フィルムの溶融混練では相溶性に乏しいブレンド物が得られてしまうために，この積層フィルムのマテリアルリサイクルは十分に検討されていない。そこで，PE/PA 多層フィルム回収物のモデルとして LLDPE/PA6 ブレンドの力学特性と相溶化材である無水マレイン酸変性ポリプロピレン（ MPP） の添加効果 について検討した。LLDPE 中に分散するPA6 粒子によって弾性率は向上し，衝撃強度は低下した。引張降伏応力は大きく変化しなかった。相溶化材としてのマレイン酸変性PP（ MPP） の添加は，LLDPE 中に分散するPA6 粒子を微細化し，衝撃強度を顕著に向上させた。一方，MPP の添加は，弾性率や降伏強度をあまり変化させなかった。LLDPE/PA6 ブレンドへのMPP の添加は，高い衝撃強度と高い弾性率を両立させる優れた手法であった。

粘着物性と導電性を両立した導電性粘着剤の設計を目的とし，粘着物性を維持させる観点から高いアスペクト比を有する多層カーボンナノチューブ（ MWCNT） を用いてより少量で高い導電性を得るための影響因子を調査した。ウレタン系（ PU） およびアクリル系（ PA） を含む20 種類の溶剤系粘着剤に添加した結果，特にMWCNT と粘着剤の表面自由エネルギーの分散成分（ γ_s^d） の差が大きい程，MWCNT 同士が凝集・連結して高い導電性が得られた。またPU と粘着付与樹脂（ TF） を混合した海島型相分離構造を有する粘着剤においては，特にMWCNT と親和性の高いTF が海相となる配合比にてMWCNT が効率よくネットワークを形成し低抵抗を示した。 これらの知見を活用し，シリル化ウレタン系粘着剤をベースとして1.00wt％以下のMWCNT 添加量で20N/25mm 以上の強粘着力と10⁴Ω/sq. 以下の表面抵抗率を達成した導電性粘着剤を設計した。