Abstract
In the preparation of polymer-based functional materials, it is often difficult to express the desired function using a single substance. Thus, multiple materials are often combined to achieve a desired function using methods such as the addition of a filler or lamination. However, when materials are mixed using a filler, the transparency of the polymer decreases. Therefore, a prediction indicator for transparency is needed. In this study, we focused on using the Hansen solubility parameter (HSP) as a predictor of transparency. The value of δd, which is the dispersion force term of the solubility parameter, is considered to be related to the refractive index of the solvent. Silica particles were selected as model particles, and the HSP value was determined. We examined the possibility of evaluating the transparency in a solvent containing silica particles based on the HSP value, and our results indicated that a smaller difference in δd between the particles and solvent corresponded with a higher transparency. The HSP value could be used as an index for evaluation of the dispersibility and solubility of the polymer. By using HSP theory in the material design of composite materials, it is thus considered possible to use the same index to simultaneously evaluate the dispersibility evaluation and predict the transparency of the filler.
Highlights
Plastic films have attracted attention as a potential substitute for glass as a display material
The Hansen solubility parameter (HSP) values of the silica particle surface determined from the Hansen solubility sphere were δd 1⁄4 16.7 [(MPa)1/2], δp 1⁄4 13.7 [(MPa)1/2], and δh 1⁄4 14.0 [(MPa)1/2]
Disc-shaped silica particles in various solvents were examined, and the HSP on the surface of the particles was determined from the contact angle
Summary
Plastic films have attracted attention as a potential substitute for glass as a display material. The properties generally desired for plastic films include high heat resistance, transparency, and chemical resistance [1]. The addition of a filler to the resin often improves the heat resistance and mechanical strength [1,2,8]; the transparency may be impaired. A method for predicting the transparency of a single resin from the molecular structure has previously been reported [9]. No prediction method for the transparency after the addition of a filler to solvents and resins has been reported. Hansen further refined the Hildebrand solubility parameter as consisting of three components based on the type of molecular interaction involved: namely, dispersion forces (δd), intermolecular dipole interactions (δp), and hydrogen-bonding interactions (δh) [10,12]
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