Elastomeric polypropylenes from unbridged 2-phenylindene zirconocene catalysts: temperature dependence of crystallinity and relaxation properties

Macromolecules

Volumn 32, Issue 10, 1999, Pages 3334-3340

  Hu, Yirong ^a   Carlson, Eric D ^b   Fuller, Gerald G ^b   Waymouth, Robert M ^a  

^a STANFORD UNIVERSITY   (United States)

^b Stanford University   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; CHEMICAL RELAXATION; CRYSTAL STRUCTURE; DIFFERENTIAL SCANNING CALORIMETRY; ELASTOMERS; ETHERS; EXTRACTION; HEPTANE; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; SYNTHESIS (CHEMICAL); THERMAL EFFECTS; X RAY POWDER DIFFRACTION;

CRYSTALLINITY; ELASTIC NETWORK; IMMOBILE PHASE; ISOTACTIC PENTAD CONTENT; MOBILE PHASE; RELAXATION PROPERTIES; SOLID STATE STRUCTURE; TACTICITY; WIDE ANGLE X RAY POWDER DIFFRACTION;

POLYPROPYLENES;

EID: 0032680738     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma981336k     Document Type: Article

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44. It should be noted that the results from these characterizations may be influenced by the different cooling rates used in sample preparation. In the solid-state NMR and WAXD studies, samples were pretreated on a Mettler hotstage. Due to limitations of the hotstage, sample cooling was carried out at a rate of 10 °C/min. A cooling rate of 20 °C/min was used in the DSC and dynamic birefringence studies. Since crystallization rate plays an important role in determining the crystallinity of a material, the different cooling rates may be responsible for some of the differences that we observe. The reasonable agreement between the DSC and WAXD estimates would indicate that the cooling rate is not a major determinant.
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