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An innovative polymer processing met...

Tao, Ying.

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An innovative polymer processing method, "solid-state shear pulverization (SSSP)": Intimate mixing, compatibilization and basic understanding of the process.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	An innovative polymer processing method, "solid-state shear pulverization (SSSP)": Intimate mixing, compatibilization and basic understanding of the process./
作者:	Tao, Ying.
面頁冊數:	165 p.
附註:	Adviser: John M. Torkelson.
Contained By:	Dissertation Abstracts International67-10B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3236973
ISBN:	9780542907715

An innovative polymer processing method, "solid-state shear pulverization (SSSP)": Intimate mixing, compatibilization and basic understanding of the process.
Tao, Ying.

An innovative polymer processing method, "solid-state shear pulverization (SSSP)": Intimate mixing, compatibilization and basic understanding of the process. - 165 p.

Adviser: John M. Torkelson.

Thesis (Ph.D.)--Northwestern University, 2006.

Thermodynamic and kinetic limitations inherent in conventional melt mixing limit its ability to produce finely-dispersed immiscible polymer blends and achieve compatibilization. Solid-state shear pulverization (SSSP), which relies on a modified twin screw extruder to process materials in the solid state, is designed to overcome these limitations. Repeated fragmentation and fusion steps accompanying SSSP lead to intimate mixing and compatibilization which are difficult to be achieved in conventional melt mixing.

ISBN: 9780542907715Subjects--Topical Terms:

1018531
Engineering, Chemical.

An innovative polymer processing method, "solid-state shear pulverization (SSSP)": Intimate mixing, compatibilization and basic understanding of the process.
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245 1 3 $a An innovative polymer processing method, "solid-state shear pulverization (SSSP)": Intimate mixing, compatibilization and basic understanding of the process.
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500 $a Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5906.
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520 $a Thermodynamic and kinetic limitations inherent in conventional melt mixing limit its ability to produce finely-dispersed immiscible polymer blends and achieve compatibilization. Solid-state shear pulverization (SSSP), which relies on a modified twin screw extruder to process materials in the solid state, is designed to overcome these limitations. Repeated fragmentation and fusion steps accompanying SSSP lead to intimate mixing and compatibilization which are difficult to be achieved in conventional melt mixing.
520 $a This novel process method, SSSP, has been shown for the first time to be capable of forming quasi-nanostructured polymer blends. When an 80/20 wt% polystyrene (PS)/poly (methyl methacrylate) PMMA blend is made by SSSP, the blend exhibits many irregular, minor-phase domains with length scales of &sim; 100 nm or less. However, the dispersed-phase domain size in an analogous blend made by melt mixing is one order of magnitude larger. The addition of styrene (S)/methyl methacrylate (MMA) gradient copolymer into the PS/PMMA blend during SSSP compatibilizes the blend and can largely maintain the nanostructure during high temperature annealing. Compatibilization 4 can also be achieved with the addition of block copolymer during SSSP of PS/high density polyethylene (HDPE); in particular, the addition of 5 wt% styrene/ethylene-butylene/styrene (SEBS) block copolymer to a 90/10 wt% PS/HDPE blend during SSSP yields a reduction in coarsening rate by a factor of thirty relative to a melt-mixed blend without copolymer.
520 $a The understanding of the basic principles associated with SSSP has been advanced. Polymer materials accumulate, and pressure is built up in the region of bi-lobe and tri-lobe kneading disk blocks, in which repeated fragmentation and fusion steps can occur. The development of polymer blend morphology along a screw during SSSP was shown to be blend specific. The attainment during SSSP of the final microstructure in PS/poly (n-butyl methacrylate) blends and the final quasi-nanostructure in PS/PMMA blends is evident after the initial mixing zone and before the high-shear pulverization zone in the SSSP screw design. However, in the case of PS/HDPE blends, the HDPE dispersed phase size continues to decrease along the total screw length. Finally, the first residence time study for SSSP has shown a distribution typical of twin-screw melt extrusion.
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