Influence of thermal treatments, molecular weight, and molecular weight distribution on the crystallization of b-isotactic polypropylene
Six samples of isotactic polypropylene were examined to study the influence of the thermal treatments and the molecular weights and their distribution on the *b-crystallization of the polymer. The highest amount of the *b-phase was obtained by isothermal crystallization and in correspondence of high...
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| Published in: | Journal of applied polymer science Vol. 91; no. 2; pp. 1008 - 1012 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
15-01-2004
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| Online Access: | Get full text |
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| Summary: | Six samples of isotactic polypropylene were examined to study the influence of the thermal treatments and the molecular weights and their distribution on the *b-crystallization of the polymer. The highest amount of the *b-phase was obtained by isothermal crystallization and in correspondence of high average molecular weights and wide molecular weight distributions. Small-angle X-ray scattering pointed out that a partial *b-crystallization seems not to influence the lamellar morphology parameters. Differential scanning calorimetry measurements, at different heating rates, allowed us to confirm that the multiple melting endotherms behavior of the *b-phase is to be correlated to a melting-recrystallization-melting mechanism. |
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| Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-1 |
| ISSN: | 0021-8995 |