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From synthesis to processing: Links...

Guzman, Job Daniel.

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From synthesis to processing: Links between polymerization mechanism, molecular weight distribution, rheological behavior, and extrusion.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	From synthesis to processing: Links between polymerization mechanism, molecular weight distribution, rheological behavior, and extrusion./
作者:	Guzman, Job Daniel.
面頁冊數:	90 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6200.
Contained By:	Dissertation Abstracts International64-12B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3117124
ISBN:	0496645496

From synthesis to processing: Links between polymerization mechanism, molecular weight distribution, rheological behavior, and extrusion.
Guzman, Job Daniel.

From synthesis to processing: Links between polymerization mechanism, molecular weight distribution, rheological behavior, and extrusion. - 90 p.

Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6200.

Thesis (Ph.D.)--Illinois Institute of Technology, 2003.

A rheological model to link the molecular weight distribution (MWD) and the rheological behavior of linear polymer melts has been developed. This rheological model offers some advantages over previous developments; e.g., MWDs can be determined from rheological data without a priori knowledge of polymers properties such as the plateau modulus. Unimodal MWDs, in agreement with chromatographic measurements, have been determined for polystyrene and polycarbonates samples using only typical values for the scaling exponent (alpha ≈ 3.4) and dynamic moduli data. When coupled with a reactor model, the rheological model permits the prediction of rheological properties of linear polymers as a function of reactor conditions. A reactor model has been developed here to account for the possible dependence of polymerization rates on diffusion phenomena. The results show that, in step-growth polymerizations, diffusion limitations can narrow the MWD and alter the way it evolves with increasing conversion. The rheological model can also be used to predict processing performance, when a model for the processing equipment is available. Here, the metering zone in closed-discharge single-screw extrusion is analyzed, and new analytic relations between fluid theological properties and extrusion parameters are provided.

ISBN: 0496645496Subjects--Topical Terms:

1018531
Engineering, Chemical.

From synthesis to processing: Links between polymerization mechanism, molecular weight distribution, rheological behavior, and extrusion.
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245 1 0 $a From synthesis to processing: Links between polymerization mechanism, molecular weight distribution, rheological behavior, and extrusion.
300 $a 90 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6200.
500 $a Adviser: Jay D. Schieber.
502 $a Thesis (Ph.D.)--Illinois Institute of Technology, 2003.
520 $a A rheological model to link the molecular weight distribution (MWD) and the rheological behavior of linear polymer melts has been developed. This rheological model offers some advantages over previous developments; e.g., MWDs can be determined from rheological data without a priori knowledge of polymers properties such as the plateau modulus. Unimodal MWDs, in agreement with chromatographic measurements, have been determined for polystyrene and polycarbonates samples using only typical values for the scaling exponent (alpha ≈ 3.4) and dynamic moduli data. When coupled with a reactor model, the rheological model permits the prediction of rheological properties of linear polymers as a function of reactor conditions. A reactor model has been developed here to account for the possible dependence of polymerization rates on diffusion phenomena. The results show that, in step-growth polymerizations, diffusion limitations can narrow the MWD and alter the way it evolves with increasing conversion. The rheological model can also be used to predict processing performance, when a model for the processing equipment is available. Here, the metering zone in closed-discharge single-screw extrusion is analyzed, and new analytic relations between fluid theological properties and extrusion parameters are provided.
590 $a School code: 0091.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Plastics Technology. $3 1023683
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710 2 0 $a Illinois Institute of Technology. $3 1018749
773 0 $t Dissertation Abstracts International $g 64-12B.
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791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3117124