Additive group contributions to density and glass transition temperature in polyurethanes.: An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB00098M28Q
ISBN-13978B00098M281
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on December 1, 1998. The length of the article is 3113 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: The method of additive properties was applied to the density and glass transition temperature, [T.sub.g], of linear amorphous polyurethanes. This method assumes that certain polymer properties result from the additive effects of unique constituent group properties and that these group properties are independent of their environment. To determine the component properties, 14 model polyurethanes were synthesized. The polymers contained only the following four groups: urethane, phenylene, methylene, and ether oxygen. The densities and [T.sub.g]'s of these polymers were measured. Using these measured values, the known composition of each polymer, and an appropriate additive form, the molar component properties were calculated using a matrix least-squares simultaneous fit algorithm. An error analysis confirmed that the component values were determined with greater accuracy than literature results. The densities ranged from 1.0 to 1.2 g/[cm.sup.3] and measured versus predicted densities agreed to within 0.3% on the average. Tg's ranged from -70 [degrees] C to 70 [degrees] C and measured versus predicted [T.sub.g]'s agreed to within 1.3% on the average.
Citation Details
Title: Additive group contributions to density and glass transition temperature in polyurethanes.
Author: Jeffry Fedderley
Publication:Polymer Engineering and Science (Refereed)
Date: December 1, 1998
Publisher: Society of Plastics Engineers, Inc.
Volume: 38 Issue: 12 Page: 2072(5)
Distributed by Thomson Gale
From the author: The method of additive properties was applied to the density and glass transition temperature, [T.sub.g], of linear amorphous polyurethanes. This method assumes that certain polymer properties result from the additive effects of unique constituent group properties and that these group properties are independent of their environment. To determine the component properties, 14 model polyurethanes were synthesized. The polymers contained only the following four groups: urethane, phenylene, methylene, and ether oxygen. The densities and [T.sub.g]'s of these polymers were measured. Using these measured values, the known composition of each polymer, and an appropriate additive form, the molar component properties were calculated using a matrix least-squares simultaneous fit algorithm. An error analysis confirmed that the component values were determined with greater accuracy than literature results. The densities ranged from 1.0 to 1.2 g/[cm.sup.3] and measured versus predicted densities agreed to within 0.3% on the average. Tg's ranged from -70 [degrees] C to 70 [degrees] C and measured versus predicted [T.sub.g]'s agreed to within 1.3% on the average.
Citation Details
Title: Additive group contributions to density and glass transition temperature in polyurethanes.
Author: Jeffry Fedderley
Publication:Polymer Engineering and Science (Refereed)
Date: December 1, 1998
Publisher: Society of Plastics Engineers, Inc.
Volume: 38 Issue: 12 Page: 2072(5)
Distributed by Thomson Gale
