2.1 Materials
The Polypropylene T30S (Homopolymer, the density is 0.905 g·cm−3, the MFI index is 2.6 g·10min-1, and the melting point is 170 °C) was purchased from China Petroleum and Chemical Corporation Limited. SCG was from a local coffee shop. Petroleum ether having a boiling range of 60-90 ℃ with analytical pure was purchased from Hangzhou Gaojing Fine Chemical Co., LTD.