Polyurethane tri-block copolymers--synthesis, mechanical, elastic, and rheological properties.(Report): An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB003HQBQEI
ISBN-13978B003HQBQE9
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on April 1, 2010. The length of the article is 5703 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: A series of polyurethane tri-block copolymers were synthesized by reacting a 4,4'-methylenebis(phenyl isocyanate) (MDI)-endcapped poly(tetramethylene oxide) (PTMO, [M.sub.n] = 2,000 g/mol) with a monoamine-diamide (6T6m) hard segment (HS). The concentration of the HS in the copolymer was varied between 9 and 33 wt % by changing the length of the soft mid-block segment. The structure of the copolymers was analyzed by nuclear magnetic resonance, the amide crystallinity was investigated by Fourier transform infra-red and the thermal properties were studied by differential scanning calorimetry. The mechanical and elastic properties of the tri-block copolymer were subsequently explored by dynamic mechanical analysis, compression set and tensile experiments, and the melt rheological behavior was studied by a parallel plate method. The amide end groups displayed a high crystallinity and the modulus of the tri-block copolymers was relatively high. The fracture strain increased strongly with the molecular weight and the copolymers demonstrated a ductile fracture behavior for molecular weights above 6000 g/ mol. Good compression set values were obtained for the tri-block copolymers despite their low molecular weight. In the molten state, the tri-block polymers displayed a gelling effect at low frequencies, which was believed to be a result of a clustering of the end-segments. POLYM. ENG. SCI., 50:747-755, 2010. [C]2009 Society of Plastics Engineers
Citation Details
Title: Polyurethane tri-block copolymers--synthesis, mechanical, elastic, and rheological properties.(Report)
Author: Araichimani Arun
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: April 1, 2010
Publisher: Society of Plastics Engineers, Inc.
Volume: 50 Issue: 4 Page: 747(9)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: A series of polyurethane tri-block copolymers were synthesized by reacting a 4,4'-methylenebis(phenyl isocyanate) (MDI)-endcapped poly(tetramethylene oxide) (PTMO, [M.sub.n] = 2,000 g/mol) with a monoamine-diamide (6T6m) hard segment (HS). The concentration of the HS in the copolymer was varied between 9 and 33 wt % by changing the length of the soft mid-block segment. The structure of the copolymers was analyzed by nuclear magnetic resonance, the amide crystallinity was investigated by Fourier transform infra-red and the thermal properties were studied by differential scanning calorimetry. The mechanical and elastic properties of the tri-block copolymer were subsequently explored by dynamic mechanical analysis, compression set and tensile experiments, and the melt rheological behavior was studied by a parallel plate method. The amide end groups displayed a high crystallinity and the modulus of the tri-block copolymers was relatively high. The fracture strain increased strongly with the molecular weight and the copolymers demonstrated a ductile fracture behavior for molecular weights above 6000 g/ mol. Good compression set values were obtained for the tri-block copolymers despite their low molecular weight. In the molten state, the tri-block polymers displayed a gelling effect at low frequencies, which was believed to be a result of a clustering of the end-segments. POLYM. ENG. SCI., 50:747-755, 2010. [C]2009 Society of Plastics Engineers
Citation Details
Title: Polyurethane tri-block copolymers--synthesis, mechanical, elastic, and rheological properties.(Report)
Author: Araichimani Arun
Publication:Polymer Engineering and Science (Magazine/Journal)
Date: April 1, 2010
Publisher: Society of Plastics Engineers, Inc.
Volume: 50 Issue: 4 Page: 747(9)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
