Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 110, Issue 1, Pages 49-54Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/app.28571
Keywords
density; mechanical properties; morphology; polyurethanes; thermodynamics
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Funding
- Ministry of Education, Science Technology (MEST)
- Korea Industrial Technology Foundation (KOTEF)
- National Research Foundation of Korea [R15-2006-022-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Rigid polyurethane foams (RPUFs) have been fabricated from crude MDI (CMDI) and polypropylene glycols (PPGs) of various functionalities (f) with HFC 365mfc as a blowing agent. Foam density increased, cell size and density distribution decreased with increasing f while the closed cell content was kept constant over 92%, The gel time, tack-free time, volume change, and the thermal conductive of the foam showed a minimum with f = 5, and the existence of minimum has been explained in terms of a large mixture viscosity and cell wall resistance. (C) 2008 Wiley Periodicals, Inc.
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