Near-Infrared Spectroscopic Analyses of Poly(ether urethane urea) Block Copolymers. Part II: Phase Separation

$29.00 plus tax (Refund Policy)

Buy Article:

Abstract:

Second-overtone carbonyl bands at 1918 and 2036 nm in the near-infrared (NIR) spectrum are used to monitor the phase separation of poly(ether urethane urea) (PEUU) block copolymers at 100°C. Exact positions of urea and urethane carbonyl bands are determined by NIR spectroscopic analyses of model compounds in bulk and in dilute solution. Results indicate that the carbonyl groups in the copolymers are affected by two different structural processes that occur with annealing. A faster process causes an increase in the number of free urethane groups, and a slower process causes a decrease in the number of free urea and urethane carbonyl groups. Although several structural mechanisms can be used to describe these trends, more information is necessary to identify exact structural changes that occur with annealing.

Keywords: Near-infrared spectroscopy; Polymers

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702904087460

Affiliations: 1: Department of Chemistry, BG-10, University of Washington, Seattle, Washington 98195; present address: Max-Planck-Institut für Polymerforshung, Postfach 3148, D-6500, Mainz, FRG 2: Department of Chemical Engineering and Center for Bioengineering, University of Washington, Seattle, Washington 98195; current address: Ciba Corning Diagnostics, 63 North St., Medfield, MA 02052 3: Department of Chemical Engineering and Center for Bioengineering, University of Washington, Seattle, Washington 98195 4: Department of Chemistry, BG-10, University of Washington, Seattle, Washington 98195

Publication date: May 1, 1990

More about this publication?
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more