## Abstract The nonβparallel chain structure determined for Ξ³βphase isotactic polypropylene (Ξ³βiPP) is confirmed by Rietveld analysis for highly isotactic high molecular mass iPP crystallized at 200 MPa. The new refinement shows that: (i) stereoregularity or crystallization pressure do not signific
High pressure d.t.a. study on the melting and crystallization of isotactic polypropylene
β Scribed by Chitoshi Nakafuku
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 316 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0032-3861
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The origins of the single-and double-melting endotherms of isotactic polypropylene crystallized at different temperatures were studied carefully by differential scanning calorimetry, wide-angle X-ray diffraction, and small-angle X-ray scattering. The experimental data show that spontaneous crystalli
## Abstract Melt history, pressure, and crystallization temperature are three variables that may be used to vary spherulite size in polymer systems. In this study, bulk polypropylene samples were given various melt treatments and then isothermally crystallized under constant pressure. Spherulite si