9Nikolic M S, Djonlagic J. Synthesis and Characterization of Biodegradable PolY(butylene suecinate-co-butylene adipate) s[J]. Polymer Degradation and Stability, 2001,74: 263- 270.
10Mapleston P. PP Foam Sheet Emerges as a Contender for a Range of Applications[J]. Modern Plastics, 1997, 74 (10) : 110-115.
