Naslov
The thermal stability of rigid polyurethane foam in insulating pipes

Autori
Rek, Vesna ; Hace, Drago ; Bravar, Mladen ; Jagodar, Andrija

Izvornik
Die angewandte makromolekulare Chemie (0003-3146) 176 (1990), 1; 135-146

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
rigid polyurethane foam ; constructed ; insulating pipe ; isothermal aging ; equipment ; chemical changes ; physical properties

Sažetak
The rigid polyurethane, PUR, foam was prepared by reacting diphenylmethane diisocyanate, MDI, with aliphatic correactants of polyether type. The insulating pipe was made by moulding technic. The PUR pipe was subjected to isothermal aging by special equipment which wasconstructed for this purpose in order to study the structural changes in PUR foam under various temparatures and to define the maximal temperature at which it might be used as insulation in insulating pipes. The structural changes of PUR foam were studied by means of spectrophoto-metric measurement and thermal analysis. The evidence of thermal degradation of PUR foam has found. Its course and intensity depend upon the temperature and differ throught the verticale cross-section of the insulating pipe. The correlation between chemical changes of PUR foam and its physical properties are also discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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