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}
}
  • J. Varga
  • Published 1992
  • Materials Science
  • Journal of Materials Science
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… 
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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
Investigation on structural changes of isotactic polypropylene mesophase in the heating process by using two-dimensional infrared correlation spectroscopy
Highly efficient nucleating additive for isotactic polypropylene studied by differential scanning calorimetry
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…
Analysis of the Dynamic Crystallisation of Isotactic Polypropylene/α-Nucleating Agent Systems by DSC
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…
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References

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Polymorphism in isotactic polypropylene
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…
Studies on the monoclinic and hexagonal modifications of isotactic polypropylene
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…
Structure and properties of isotactic polypropylene
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…
Spherulitic Crystallization in Polypropylene
A survey has been made of spherulites formed by the isothermal crystallization of polypropylene from the melt in the temperature range 110°–148°C. Four types of spherulite have been distinguished and…
Morphology of polypropylene crystals. II. Twinning of lamellar crystals
Twinned crystals were obtained from fractionated isotactic polypropylene of Mw = 600,000 by isothermal crystallization at 130°C. for 20 hr. from dilute α-chloronaphthalene solution (0.005 wt.-%).…
The spherulitic and lamellar morphology of melt-crystallized isotactic polypropylene
On the existence of near-range order in isotactic polypropylenes
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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…
Morphology of polypropylene crystallized from the melt
Morphology of different types of isotactic polypropylene spherulites crystallized from melt
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