*2.1. Materials*

The 12 kinds of PUSX solutions and films were kindly synthesized and provided by Shin-Etsu Chemical Co., Ltd., and Dainichiseika Color & Chemicals Mfg. Co., Ltd. These synthesized PUSX solutions in *N*,*N*-dimethylformamide/ ethyl methyl ketone (DMF/MEK) standardized a solid content of 30 wt%. The structures of two types of PUSX are shown in Figure 1. PUSX with different silicone concentrations and chain lengths are listed in Table 1. Solvents such as *N*,*N*-dimethylformamide (DMF) and ethyl methyl ketone (MEK) were purchased from Wako Pure Chemical Industries., Ltd., and used as received.

**Figure 1.** Structures of block-type silicone-modified polyurethane (PUSX) (**a**) and graft-type PUSX (**b**).

**Table 1.** Polyurethane (PU) samples and silicone modified polyurethane (PUSX) samples of block type and graft type.

