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Multilayer co-extrusion of biodegrad...

Tulsiani, Pawan K.

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Multilayer co-extrusion of biodegradable thermoplastics to study the effect of interfacial slip at polymer walls.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Multilayer co-extrusion of biodegradable thermoplastics to study the effect of interfacial slip at polymer walls./
作者:	Tulsiani, Pawan K.
面頁冊數:	78 p.
附註:	Source: Masters Abstracts International, Volume: 42-02, page: 0676.
Contained By:	Masters Abstracts International42-02.
標題:	Plastics Technology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1416213
ISBN:	0496209981

Multilayer co-extrusion of biodegradable thermoplastics to study the effect of interfacial slip at polymer walls.
Tulsiani, Pawan K.

Multilayer co-extrusion of biodegradable thermoplastics to study the effect of interfacial slip at polymer walls. - 78 p.

Source: Masters Abstracts International, Volume: 42-02, page: 0676.

Thesis (M.Sc.Eng.)--University of Massachusetts Lowell, 2003.

Blending two or more polymers together has been used as an alternative to tailor the end use properties of polymeric materials. Most of the polymers of practical interest in blends are immiscible, thus multi phases coexist in such blends. Their properties are dictated by the micro-morphology of each phase, which develops during mixing, and are determined by interfacial and rheological properties of the components. Interfacial properties and rheology interact with each other, making it difficult to clearly separate their individual effects. Coextruded multilayers provide a model system to decouple interfacial dynamics from component rheology.

ISBN: 0496209981Subjects--Topical Terms:

1023683
Plastics Technology.

Multilayer co-extrusion of biodegradable thermoplastics to study the effect of interfacial slip at polymer walls.
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245 1 0 $a Multilayer co-extrusion of biodegradable thermoplastics to study the effect of interfacial slip at polymer walls.
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500 $a Director: Stephen McCarthy.
502 $a Thesis (M.Sc.Eng.)--University of Massachusetts Lowell, 2003.
520 $a Blending two or more polymers together has been used as an alternative to tailor the end use properties of polymeric materials. Most of the polymers of practical interest in blends are immiscible, thus multi phases coexist in such blends. Their properties are dictated by the micro-morphology of each phase, which develops during mixing, and are determined by interfacial and rheological properties of the components. Interfacial properties and rheology interact with each other, making it difficult to clearly separate their individual effects. Coextruded multilayers provide a model system to decouple interfacial dynamics from component rheology.
520 $a A number of researchers have reported anomalous lowering of viscosity in immiscible polymer blends. Slip at the interfaces between the polymers has been proposed to explain these observations. Because of the complex morphology developed in melt blends it is difficult to test the slip hypothesis. However, using layer multiplication dies in coextrusion, two or more polymers can be alternatively combined into hundreds or even thousands of continuous layers generating a large amount of well defined interfacial area and reduce the thickness of individual layers. As the interfacial area will increase the crystallinity of the individual polymer will decrease in the contact area and the coextrudates will be more ductile compared to individual polymers extrudate. Poly-3-Hydroxybutyrate (PHB), Polylactic Acid (PLA) and Eastar (Copolyester) were coextruded in two layer structures. Tensile properties of the coextruded layers and the homopolymer layers were measured to understand if the interfacial slip had an impact on otherwise brittle homopolymer layers.
520 $a It was observed that the percent elongation of the coextruded layers is more than that of the monolayers. Also the maximum percent stress for break decreased for the coextruded layers compared to the monolayers.
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