Influences of injection temperature on mechanical properties of linear low-density polyethylene（ LLDPE） / polyamide 6（ PA6） blends which were model blends of multilayer films were investigated. When the injection temperature was 170 ℃, shape and size of PA6 particles of dumbbell were almost same with that of strand before injection molding. However, when the injection temperature was higher than 190 ℃, the shape and size of PA6 particles significantly changed with the injection temperature. On the other hand, the mechanical properties（ modulus, tensile yield stress and impact strength） slightly changed with the injection temperature. Incorporation of maleic anhydride grafted polypropylene（ MPP） significantly minimized PA 6 particles in the blends. The incorporation of MPP significantly increased impact strength and slightly changed the modulus and tensile yield stress. At the LLDPE / PA6 / MPP ternary blends, change of the mechanical properties with the injection temperature was smaller than at the LLDPE / PA6 binary blends. In this way, the incorporation of MPP contributed to improvement and good stability of the mechanical properties.

Since polypropylene（ PP） is non-polar resin, it is incompatible with inorganic or highly polar fillers. PP and these are, so to speak, the relationship between water and oil. Therefore, it is necessary to add a Maleic Anhydride-modified polypropylene（ MAPP） in order to improve the mechanical properties of the PP composite. The characteristic of MAPP（ graft amount, molecular weight） affects the mechanical properties. In recent years, research and development of CNF（ Cellulose Nano Fiber）/PP composites has been actively carried out. MAPP is necessary for this development as well. MAPP is effective not only in improving mechanical properties but also in improving the dispersibility of CNF. We describe the function and effect of MAPP（ graft amount, molecular weight） on the mechanical properties and the dispersibility of filler.

Residual stress at the interface between a glass fiber-reinforced phenolic resin having a fiber orientation and copper foil was analyzed in situ during curing and thermal-testing via time-resolved X-ray diffraction measurements using a sin ² Ψ method, in which the specimen was prepared via a transfer molding. The residual stress, which was estimated from the stress in copper, shifted toward tensile and compressive stress directions in heating and cooling, respectively, due to a difference in the magnitude of thermal expansion and contraction between the resin and copper. There was an anisotropy of coefficient of linear expansion（ CTE） of the resin due to the fiber orientation, which caused a residual stress anisotropy. The temperature at a stress-free state indicated that the residual stress was also affected by a resin temperature at which the resin-copper adhesive interface first formed during molding.

The author investigated the combinational effect of two kings of epoxy terminated poly（oxytetramethylene）glycols E-PT with diglycidylether of bisphenol-A（ DGEBA）. Molecular weight（s Mn） of E-PT were 870（6ET） and 2016（20ET） respectively. Blends of 6ET and 20ET were added to DGEBA, then the mixtures were cured by typical tertiary amine. We examined the physical properties of cured epoxy resins which were varied blend ratio and adding amount of 6ET and 20ET. Adhesive properties（ T-peel strength and tensile shear strength） of blend ratio 5/5 system greatly increased at 20phr in comparison to two individual（ no-blend） systems and other blend systems. This behavior of blend system is remarkable characteristic. Regarding blend systems of 6ET and 20ET, bending properties and fracture toughness indicated higher value and maximum value shifted to higher adding amount side as blend ratio of 6ET increased. We revealed that the morphology of blend ratio 5/5 system was closely related to various physical properties. In concrete terms, fracture toughness held high value in micro phase separation structure of the sea and island type with fine particle, and adhesive properties showed high strength in roundish uneven morphology. It was clarified that various physical properties were greatly influenced by different morphology caused by blend ratio and adding amount of blends of 6ET and 20ET.