Supermolecular structure of isotactic polypropylene
@article{Varga1992SupermolecularSO, title={Supermolecular structure of isotactic polypropylene}, author={J{\'o}zsef Varga}, journal={Journal of Materials Science}, year={1992}, volume={27}, pages={2557-2579} }
The crystalline structure, spherulitic crystallization and melting behaviour of isotactic polypropylene (iPP) is comprehensively reviewed, illustrated and discussed. It is demonstrated and summarized how the nucleation, development and growth of the different spherulites depend on the crystallization and melting conditions both in quiescent and sheared melt. Based on the results the microtexture development during real processing conditions is elucidated for selected examples. Several subjects…
478 Citations
Spherulitic Morphology of Isotactic Polypropylene and its Melting Behavior
- Materials Science
- 2001
Abstract The crystallization and lamellar morphology of isotactic polypropylene (ipp) have been investigated by thermal analysis and electron microscopy. When ipp samples are crystallized above…
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Various aspects of polypropylene (PP) crystallization are discussed. The methods of studying the crystallization process and formed crystalline structure are presented. The polymorphism of crystals…
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The more recent results concerning the polymorphic behavior of isotactic polypropylene (iPP) are presented. Specifically contributions on the recently determined γ phase crystal structure, in which…
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The influence of low contents of a liquid crystalline polymer on the crystallization and melting behavior of isotactic polypropylene (iPP) was investigated using electron and optical microscopy,…
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The role of metastability in the micromorphologic features of sheared isotactic polypropylene melts
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Investigation on structural changes of isotactic polypropylene mesophase in the heating process by using two-dimensional infrared correlation spectroscopy
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The influence of an organic phosphate derivative in the crystallization of the monoclinic phase of isotactic polypropylene was studied by differential scanning calorimetry. To analyze the nucleation…
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The nucleation efficiency of dibenzylidene sorbitol, methyldibenzylidene sorbitol and 1,2,3,4-bis- (3,4-dimethylbenzylidene) sorbitol in the crystallisation of the monoclinic phase of isotactic…
References
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Abstract The conditions under which a given form of any of the three distinct polymorphic crystalline phases of isotactic polypropylene can be obtained have been investigated. The relationship…
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Pure isotactic polypropylene, which is isothermally crystallized from the melt in the temperature range between 0°C and 140°C, displays only the monoclinic α-modification whereas samples which…
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ABSTRACT The crystal structure of isotactic polypropylene and its chemical-physical properties are described here. The polymer crystallizes in the Cc space group with the following constants of the…
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The crystallization and melting behaviour of isotactic polypropylene (iPP) samples synthetized with different catalyst systems (low and high-yield) have been studied by differential scanning…