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Shear-induced crystallization of mod...

Elmoumni, Aadil.

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Shear-induced crystallization of model polymers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shear-induced crystallization of model polymers./
作者:	Elmoumni, Aadil.
面頁冊數:	100 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1027.
Contained By:	Dissertation Abstracts International66-02B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3163664
ISBN:	0496976389

Shear-induced crystallization of model polymers.
Elmoumni, Aadil.

Shear-induced crystallization of model polymers. - 100 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 1027.

Thesis (Ph.D.)--University of Massachusetts Amherst, 2005.

The properties of a product made of semi-crystalline polymers strongly depend on both molecular parameters and on the processing conditions applied. This dissertation is focused on flow-induced structure formation correlating the material and crystallization time scales with the structure development in isotactic polypropylene (iPP) after a temperature quench. Morphological changes during the quiescent (no flow prior to crystallization) and shear-induced (with flow prior to crystallization) isothermal crystallization have been monitored with optical microscopy, light scattering and rheology. The experiments have the purpose to identify the effects of shear rate, total strain, molar mass and high molecular weight fraction on the crystallization of iPP. Dimensionless quantities are introduced to correlate the characteristic time scales with structure development; namely, the Weissenberg number ( We), consisting of the product of the applied shear rate and a material characteristic relaxation time ( g&d2;ol r ) is introduced to demonstrate the transition from spherulitic to oriented structure. A dimensionless characteristic crystallization time scale (tau), defined as the ratio of the experimental time and a characteristic crystallization time, and allows for comparison of crystallization patterns of samples with different molecular specifications (molecular weight, molecular weight distribution) and at different thermo-mechanical conditions. Wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) show the characteristics of the crystalline populations present in the cooled samples after completion of crystallization.

ISBN: 0496976389Subjects--Topical Terms:

1018531
Engineering, Chemical.

Shear-induced crystallization of model polymers.
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520 $a The properties of a product made of semi-crystalline polymers strongly depend on both molecular parameters and on the processing conditions applied. This dissertation is focused on flow-induced structure formation correlating the material and crystallization time scales with the structure development in isotactic polypropylene (iPP) after a temperature quench. Morphological changes during the quiescent (no flow prior to crystallization) and shear-induced (with flow prior to crystallization) isothermal crystallization have been monitored with optical microscopy, light scattering and rheology. The experiments have the purpose to identify the effects of shear rate, total strain, molar mass and high molecular weight fraction on the crystallization of iPP. Dimensionless quantities are introduced to correlate the characteristic time scales with structure development; namely, the Weissenberg number ( We), consisting of the product of the applied shear rate and a material characteristic relaxation time ( g&d2;ol r ) is introduced to demonstrate the transition from spherulitic to oriented structure. A dimensionless characteristic crystallization time scale (tau), defined as the ratio of the experimental time and a characteristic crystallization time, and allows for comparison of crystallization patterns of samples with different molecular specifications (molecular weight, molecular weight distribution) and at different thermo-mechanical conditions. Wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) show the characteristics of the crystalline populations present in the cooled samples after completion of crystallization.
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