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Maximum Rate of Crystallization and Morphology of Random Propylene Ethylene Copolymers as a Function of Comonomer Content up to 21 mol
| Content Provider | Semantic Scholar |
|---|---|
| Author | Jeon, Keesu Chiari, And Y. L. Alamo, Rufina G. |
| Copyright Year | 2008 |
| Abstract | We report a study of the primary chain microstructure, crystallization kinetics, and crystalline morphologies of propylene ethylene copolymers (PE) synthesized with metallocene catalysts in a range of ethylene up to 21 mol %. A 13C NMR triad distribution analysis lends support for a random distribution of the comonomer in the complete series. Melting (Tm) and crystallization (Tc) temperatures decrease with increasing ethylene more rapidly than the decrease of the glass transition temperature (Tg). Consequently, for ethylene >10 mol % the crystallization is observed at Tcs relatively close to Tg allowing to observe experimentally the maximum of the crystallization rate. In the low Tc range, segmental dynamics play a prominent role in developing the semicrystalline structure, and the crystallization rate decreases dramatically with increasing molar mass. For a fixed molar mass and undercooling, the strong decrease of the crystallization rate with increasing ethylene, especially for copolymers with >10 mol %... |
| Starting Page | 95 |
| Ending Page | 108 |
| Page Count | 14 |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/ma070757b |
| Volume Number | 41 |
| Alternate Webpage(s) | https://legacywww.magnet.fsu.edu/library/publications/NHMFL_Publication-3812.pdf |
| Alternate Webpage(s) | https://doi.org/10.1021/ma070757b |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
