Injection molding of thin-wall parts with micro/nanoscale patterns using various polymers was performed to clarify the processability and surface replication of molded parts.Effects of process conditions on processability,higher-order structure and surface properties of molded parts were evaluated.The optical anisotropy in the vicinity of the gate became higher at any other positions.Height replication ratio of surface patterns increased with increasing injection speed,holding pressure,injection temperature and mold temperature.In the case of nanomolding,negative birefringence toward flow direction appeared higher than at the skin-shear region from the observation of skin-shear-core structure inside molded parts.Thus molecular orientation axis oriented along the thickness direction because of deformation during de-molding process.Thermal stability of nano-surface patterns was influenced by the size of surface features and internal higher-order structure.
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