Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 214, Issue 17, Pages 1951-1964Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201300296
Keywords
isotactic polypropylene; mechanical properties; mesophases; stereodefective polypropylene
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Funding
- Basell Polyolefuis (Ferrara, Italy)
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A strategy to tailor the properties of isotactic polypropylene, based on the combination of the crystallization of the mesophase and the control of the molecular structure and concentration of stereodefects via polymerization with metallocene catalysts, is presented. The mechanical properties can be modulated through the conventional slow crystallization from the melt in the and forms, depending on the concentration of stereodefects, or the crystallization of the mesophase by melt quenching. The most stereoirregular sample with rr concentration of 11% shows elastic behavior either when it is slowly crystallized in the form or when it is crystallized in the mesomorphic form, but with remarkable differences in the values of the modulus and tensile strength.
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