Crystallization and melting behavior of iPP studied by DSC

Bogoeva‐Gaceva, Gordana; Janevski, Aco; Grozdanov, Anita

doi:10.1002/(sici)1097-4628(19980118)67:3<395::aid-app2>3.3.co;2-k

Cited by 6 publications

(12 citation statements)

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“…Theoretical background for calculations of parameters of crystallizations are given in our previous articles. 6,7 Based on the experimental DSC data, induction time (t i ) and half-time of crystallization (t 0.5 ) were determined. 7…”

Section: Methodsmentioning

confidence: 99%

“…The results obtained by polarizing optical microscopy showed the existence of a transcrystalline zone on the surface of PET fibers. 8 PET fibers are known to be able to cause transcrystallization. The Avrami plots for this particular model composite are linear (for all investigated T c ), enabling determination of rate constants (k) and Avrami exponents (n) (Fig.…”

Section: Isothermal Crystallizationmentioning

confidence: 99%

“…According to the kinetic theory of crystallization of polymers, 9 the energy for creation of a nucleus of critical dimensions and the critical dimensions of the growing nucleus are determined (see Figs. 5,6). Nucleation is obviously favored in composites, because lower values for energy and critical dimensions are determined as compared to PP; thus, the rate of crystallization is increased.…”

Section: Isothermal Crystallizationmentioning

confidence: 99%

“…5 It was also shown that differently treated and sized glass fibers might exhibit different nucleating ability toward isotactic PP (i-PP). 6,7 To study the influence of GF alone and in combination with PET yarns on the crys-tallization of PP, model composites are analyzed. In this article the results of a DSC analysis on isothermal and nonisothermal crystallization of PP in model composites are presented.…”

Section: Introductionmentioning

confidence: 99%

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DSC analysis of crystallization and melting behavior of polypropylene in model composites with glass and poly(ethylene terephthalate) fibers

Janevski¹,

Bogoeva‐Gaceva²,

Mäder³

1999

J. Appl. Polym. Sci.

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Isothermal and nonisothermal crystallization of maleic anhydride grafted polypropylene (PP), which is used for the production of split warp knit composite preforms, 1 are analyzed in model composites to determine the influence of reinforcement glass fibers (GF) and poly(ethylene terephthalate) (PET) binding yarns on the crystallization kinetics. Basic energetic parameters of crystallization are determined, and the melting behavior of PP in model composites is analyzed. The crystallization of PP carried out in nonisothermal and isothermal regimes is facilitated in the presence of GF, and the additional effects of PET fibers are also shown. Better conditions for nucleation, resulting in lower energy for formation of a stable nucleus and lower critical dimensions, are proposed as a reason for this. The crystal structure of PP in model composites exhibits lower lamellae thickness and is less disposed to recrystallization.

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Section: Methodsmentioning

confidence: 99%

Section: Isothermal Crystallizationmentioning

confidence: 99%

Section: Isothermal Crystallizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

DSC analysis of crystallization and melting behavior of polypropylene in model composites with glass and poly(ethylene terephthalate) fibers

Janevski¹,

Bogoeva‐Gaceva²,

Mäder³

1999

J. Appl. Polym. Sci.

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“…As in other studies on the crystallization of PP and PP/SWNT nanocomposite, we also found for nucleated PP and its nanocomposite that the crystallization temperature, T p , decreased with the increase of cooling rate. [30] Thus, crystallization occurred at higher temperatures with slower cooling rates. As a result, we may conclude that there is more time to overcome the nucleation energy barriers when crystallization starts at higher temperatures.…”

Section: Nonisothermal Crystallization Behaviormentioning

confidence: 99%

Study of the Nonisothermal Crystallization Kinetics and Melting Behaviors of Polypropylene Reinforced with Single-Walled Carbon Nanotubes Nanocomposite

Fereidoon

Ahangari

Saedodin

2008

Journal of Macromolecular Science, Part B

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Long‐term failure of transversely loaded glass/iPP

Erartsın

Arntz

Troisi

et al. 2021

J of Applied Polymer Sci

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Herein, temperature‐dependent long‐term behavior of polypropylene and its transversely loaded unidirectional glass fiber reinforced composite is investigated and a lifetime prediction method is proposed, which is based on the observed long‐term failure mechanisms. Furthermore, the effect of cooling rate during processing on the time‐dependent behavior is addressed. The composite is revealed to exhibit multiple molecular deformation mechanisms, similar to neat polypropylene, which is modeled using the Ree–Eyring approach. Failure kinetics under constant‐strain‐rate and creep tests are found to be identical and switching from creep to cyclic loading decelerates the failure, which are signs of plasticity‐controlled failure. Hence, lifetime is predicted well by using a lifetime prediction methodology for the plasticity‐controlled failure which combines the Ree–Eyring approach and the concept of critical strain. A change in the cooling rate alters the deformation and failure kinetics: lower cooling rates promote embrittlement.

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Crystallization and melting behavior of iPP studied by DSC

Cited by 6 publications

References 0 publications

DSC analysis of crystallization and melting behavior of polypropylene in model composites with glass and poly(ethylene terephthalate) fibers

DSC analysis of crystallization and melting behavior of polypropylene in model composites with glass and poly(ethylene terephthalate) fibers

Study of the Nonisothermal Crystallization Kinetics and Melting Behaviors of Polypropylene Reinforced with Single-Walled Carbon Nanotubes Nanocomposite

Long‐term failure of transversely loaded glass/iPP

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