東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back to Search results for [ null ]

Switch To: Labeled | MARC Mode | ISBD

Rheology and morphology of a polypro...

Chen, Wanlin (Warner).

Linked to FindBook

Google Book

Amazon

博客來

Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow./
Author:	Chen, Wanlin (Warner).
Description:	157 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3343.
Contained By:	Dissertation Abstracts International66-06B.
Subject:	Engineering, Industrial. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR02840
ISBN:	0494028408

Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.
Chen, Wanlin (Warner).

Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow. - 157 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3343.

Thesis (Ph.D.)--University of Toronto (Canada), 2005.

The objective of this thesis was to investigate rheological effects on the morphology of a polymer blend composed of 75 wt% Ziegler-Natta isotactic polypropylene and 25 wt% metallocene ethylene copolymer. This blend is a new class of thermoplastic polyolefin blends widely used in the automotive industry for making parts such as bumpers and fenders. Three steps were taken to meet the objective. First, viscoelastic properties of the blend components under shear were measured. Secondly, the blend was sheared in a microchannel at two processing temperatures. Above the equilibrium melting temperature of the polypropylene, shear-induced crystallization was found to be negligible. Below the melting temperature, on the other hand, crystallization was observed via the real time relative intensity and birefringence, ex situ polarized light microscopy and differential scanning calorimetry. Blend samples were obtained after different shear conditions, and were examined by laser scanning confocal fluorescence microscopy. Thirdly, the rheological and the morphological data were related by evaluating them in terms of distance from the channel centreline. It was found that droplet size is significantly influenced by droplet elasticity and coalescence, and that droplet size increases with elasticity ratio. As a result, and contrary to expectations, droplet size increased with distance from the centreline. With shear-induced crystallization, morphology depends on the interaction between rheology and crystallization. It appears that increasing droplet elasticity may lead to retraction of fibrous droplets, which would have been trapped by shear-induced crystallization.

ISBN: 0494028408Subjects--Topical Terms:

626639
Engineering, Industrial.

Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.
LDR:02498nmm 2200253 4500 001 1818374
005 20060908150235.5
008 130610s2005 eng d
020 $a 0494028408
035 $a (UnM)AAINR02840
035 $a AAINR02840
040 $a UnM $c UnM
100 1 $a Chen, Wanlin (Warner). $3 1907708
245 1 0 $a Rheology and morphology of a polypropylene/ethylene copolymer blend under channel flow.
300 $a 157 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3343.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2005.
520 $a The objective of this thesis was to investigate rheological effects on the morphology of a polymer blend composed of 75 wt% Ziegler-Natta isotactic polypropylene and 25 wt% metallocene ethylene copolymer. This blend is a new class of thermoplastic polyolefin blends widely used in the automotive industry for making parts such as bumpers and fenders. Three steps were taken to meet the objective. First, viscoelastic properties of the blend components under shear were measured. Secondly, the blend was sheared in a microchannel at two processing temperatures. Above the equilibrium melting temperature of the polypropylene, shear-induced crystallization was found to be negligible. Below the melting temperature, on the other hand, crystallization was observed via the real time relative intensity and birefringence, ex situ polarized light microscopy and differential scanning calorimetry. Blend samples were obtained after different shear conditions, and were examined by laser scanning confocal fluorescence microscopy. Thirdly, the rheological and the morphological data were related by evaluating them in terms of distance from the channel centreline. It was found that droplet size is significantly influenced by droplet elasticity and coalescence, and that droplet size increases with elasticity ratio. As a result, and contrary to expectations, droplet size increased with distance from the centreline. With shear-induced crystallization, morphology depends on the interaction between rheology and crystallization. It appears that increasing droplet elasticity may lead to retraction of fibrous droplets, which would have been trapped by shear-induced crystallization.
590 $a School code: 0779.
650 4 $a Engineering, Industrial. $3 626639
650 4 $a Plastics Technology. $3 1023683
690 $a 0546
690 $a 0795
710 2 0 $a University of Toronto (Canada). $3 1017674
773 0 $t Dissertation Abstracts International $g 66-06B.
790 $a 0779
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR02840