Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5189636 | Polymer | 2005 | 6 Pages |
Abstract
Thermal oxidative degradation behavior of polypropylene (PP) with different tacticities was studied based on the activation energy (ÎE) data obtained by thermogravimetric analysis (TGA). The ÎE value showed a negative proportion to the content of meso pentad fraction (mmmm) in all of isotactic PP (iPP) samples, and that of syndiotactic PP sample considerably deviated from this negative proportion relationship. Since the value of mmmm was directly related to polymer chain conformation, the ÎE value was thought to have close connection with the concentration of 31 helix conformation in the iPPs. The ÎE changes would be caused by the competition between uni- and bimolecular hydroperoxide decomposition, which was controlled by concentration and character of conformations of PPs.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Hisayuki Nakatani, Shoutarou Suzuki, Takamasa Tanaka, Minoru Terano,