Noticeable viscosity reduction of polycarbonate melts caused jointly by nano-silica filling and TLCP fibrillation.(thermotropic liquid crystalline ... article from: Polymer Engineering and Science
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PublisherThomson Gale
ISBN / ASINB000S7XY2Q
ISBN-13978B000S7XY29
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This digital document is an article from Polymer Engineering and Science, published by Thomson Gale on June 1, 2007. The length of the article is 5799 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Nano-Si[O.sub.2] was introduced into in-situ composites of polycarbonate (PC) and a thermotropic liquid crystalline polymer (TLCP) using a twin-screw extruder. The rheology of these composites was characterized with capillary rheometry, and the morphology of the dispersed TLCP observed with scanning electron microscopy. The rheological data revealed that the viscosity decrease of PC melts by only the addition up to 20 wt% TLCP remained smaller than 30%, while it became ~48% upon further addition of only about 1 wt% nano-Si[O.sub.2] and larger than 60% upon ~9 wt% nano-Si[O.sub.2] filling, in contrast to a 50% viscosity increase of PC melts with increase in nanosilica loading up to ~9 wt%. These silica-filled composites exhibited markedly low viscosity, especially at relatively high shear rates. The morphology of TLCP extracted from unfilled and silica-filled composites indicated that the largest viscosity reduction was correlated well with the fibrillation of TLCP droplets enhanced by nano-Si[O.sub.2]. The TLCP/Si[O.sub.2]/PC composites exhibited rheological hybrid effect with fillers at nanometer scale. POLYM. ENG. SCI., 47:757-764, 2007. [c] 2007 Society of Plastics Engineers
Citation Details
Title: Noticeable viscosity reduction of polycarbonate melts caused jointly by nano-silica filling and TLCP fibrillation.(thermotropic liquid crystalline polymer)
Author: Li-Chuan Wu
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: June 1, 2007
Publisher: Thomson Gale
Volume: 47 Issue: 6 Page: 757(8)
Distributed by Thomson Gale
From the author: Nano-Si[O.sub.2] was introduced into in-situ composites of polycarbonate (PC) and a thermotropic liquid crystalline polymer (TLCP) using a twin-screw extruder. The rheology of these composites was characterized with capillary rheometry, and the morphology of the dispersed TLCP observed with scanning electron microscopy. The rheological data revealed that the viscosity decrease of PC melts by only the addition up to 20 wt% TLCP remained smaller than 30%, while it became ~48% upon further addition of only about 1 wt% nano-Si[O.sub.2] and larger than 60% upon ~9 wt% nano-Si[O.sub.2] filling, in contrast to a 50% viscosity increase of PC melts with increase in nanosilica loading up to ~9 wt%. These silica-filled composites exhibited markedly low viscosity, especially at relatively high shear rates. The morphology of TLCP extracted from unfilled and silica-filled composites indicated that the largest viscosity reduction was correlated well with the fibrillation of TLCP droplets enhanced by nano-Si[O.sub.2]. The TLCP/Si[O.sub.2]/PC composites exhibited rheological hybrid effect with fillers at nanometer scale. POLYM. ENG. SCI., 47:757-764, 2007. [c] 2007 Society of Plastics Engineers
Citation Details
Title: Noticeable viscosity reduction of polycarbonate melts caused jointly by nano-silica filling and TLCP fibrillation.(thermotropic liquid crystalline polymer)
Author: Li-Chuan Wu
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: June 1, 2007
Publisher: Thomson Gale
Volume: 47 Issue: 6 Page: 757(8)
Distributed by Thomson Gale
