CO2 has been extensively used in polymer processing owing to its attractive properties. Dissolution of CO2 in polymer will affect the polymer properties in both melt and solid states. Moreover, the activity of CO2 can be easily tuned by changing temperature and pressure, which provides us a technique to manipulate crystalline modification transition and crystallization of polymers. Isotactic poly-1-butene (iPB-1) is a polymorphous semi crystal polyolefin with many outstanding properties. However, the relati...