2.1. Materials

PP (T30S) was purchased from Sinopec (Beijing, China). SEBS (g1652) was purchased from KRATON (Houston, TX, USA). Dichloromethane, methanol, and n-heptane were purchased from Tianjin Fuyu Fine Chemical Co, Ltd. (Tianjin, China). Acetyl chloride and anhydrous aluminum chloride were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. (Shanghai, China). The antioxidant 1010 was produced by Dongguan Yamaichi Plastic Chemical Co., Ltd. (Dongguan, China).

Ac-SEBS was prepared according to the Friedel–Crafts acylation, and the chemical equation for the synthesis of Ac-SEBS is shown in Figure 1. In total, 10 g of SEBS was dissolved in 200 mL of dichloromethane, and then the mixture was heated to 75 °C to dissolve all the SEBS. When the solution was cooled to room temperature, 5 mL of acetyl chloride were added to the solution, and after stirring for 5 min, a certain mass (0.5, 0.7 g) of anhydrous aluminum chloride was added to make the reaction proceed for 3 h. After the reaction, 300 mL of methanol were poured into the solution to precipitate white flocculent precipitates. The precipitates were filtered and dried in an oven at 50 °C. Then, the precipitates were dissolved in 200 mL of dichloromethane, heated to 75 °C, and dissolved completely. Then, 300 mL of methanol were slowly poured into the solution to precipitate white flocculent precipitates. The precipitates were filtered and dried in an oven at 50 °C to obtain pure Ac-SEBS.

The preparation process of Ac-SEBS.

Ac-SEBS, PP, and antioxidants were added to the torques rheometer for melting blending, in which the temperature was set at 190 °C, the rotor speed was set at 60 rpm, and the mixing was 5 min, in which the content of Ac-SEBS was 30%, and the content of antioxidants was 1%. After evenly mixed samples were taken out, according to different experimental requirements, a flat-plate vulcanizing machine was applied to press the samples into sheets of different thicknesses at 190 °C and 15 MPa for 15 min.