Effects of silicon surfactant in rigid polyurethane foams
The rigid polyurethane foams (RPUFs) have been fabricated from high functional crude 4,4’-di-phenylmethane diisocyanate (CMDI) and polypropylene glycols (PPGs) for a wide range of surfactant concentration with an environmently friendly blowing agent (HFC 365mfc). Cream time, gel time, and tack-free...
| Format: | Article |
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| Language: | English |
| Published: |
Budapest University of Technology
2008-03-01
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| Series: | eXPRESS Polymer Letters |
| Subjects: | |
| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0000533&mi=cd |
| _version_ | 1818806823789002752 |
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| collection | DOAJ |
| description | The rigid polyurethane foams (RPUFs) have been fabricated from high functional crude 4,4’-di-phenylmethane diisocyanate (CMDI) and polypropylene glycols (PPGs) for a wide range of surfactant concentration with an environmently friendly blowing agent (HFC 365mfc). Cream time, gel time, and tack-free time increased with the addition of surfactant. Foam density decreased rapidly to a minimum at 0.5 pphp (part per hundred polyol) surfactant due to the increased blowing efficiency with surfactant. Surface tension rapidly decreased to an asymptotic value at 2 pphp surfactant. In accordance with this, cell size decreased and closed cell content increased rapidly to constant values at low surfactant concentrations (<1 pphp). The decrease of cell size was accompanied by the decrease of thermal conductivity to give a linear relatiohship between the two implying that the series model of heat transfer is applicable. |
| first_indexed | 2024-12-18T19:15:54Z |
| format | Article |
| id | doaj.art-8673432e02f745068a63fbbad3f88740 |
| institution | Directory Open Access Journal |
| issn | 1788-618X |
| language | English |
| last_indexed | 2024-12-18T19:15:54Z |
| publishDate | 2008-03-01 |
| publisher | Budapest University of Technology |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj.art-8673432e02f745068a63fbbad3f887402022-12-21T20:56:08ZengBudapest University of TechnologyeXPRESS Polymer Letters1788-618X2008-03-012319420010.3144/expresspolymlett.2008.24Effects of silicon surfactant in rigid polyurethane foamsThe rigid polyurethane foams (RPUFs) have been fabricated from high functional crude 4,4’-di-phenylmethane diisocyanate (CMDI) and polypropylene glycols (PPGs) for a wide range of surfactant concentration with an environmently friendly blowing agent (HFC 365mfc). Cream time, gel time, and tack-free time increased with the addition of surfactant. Foam density decreased rapidly to a minimum at 0.5 pphp (part per hundred polyol) surfactant due to the increased blowing efficiency with surfactant. Surface tension rapidly decreased to an asymptotic value at 2 pphp surfactant. In accordance with this, cell size decreased and closed cell content increased rapidly to constant values at low surfactant concentrations (<1 pphp). The decrease of cell size was accompanied by the decrease of thermal conductivity to give a linear relatiohship between the two implying that the series model of heat transfer is applicable.http://www.expresspolymlett.com/letolt.php?file=EPL-0000533&mi=cdThermal propertiesrigid polyurethane foam (RPUF)cell structurecompression strengththermal conductivity |
| spellingShingle | Effects of silicon surfactant in rigid polyurethane foams eXPRESS Polymer Letters Thermal properties rigid polyurethane foam (RPUF) cell structure compression strength thermal conductivity |
| title | Effects of silicon surfactant in rigid polyurethane foams |
| title_full | Effects of silicon surfactant in rigid polyurethane foams |
| title_fullStr | Effects of silicon surfactant in rigid polyurethane foams |
| title_full_unstemmed | Effects of silicon surfactant in rigid polyurethane foams |
| title_short | Effects of silicon surfactant in rigid polyurethane foams |
| title_sort | effects of silicon surfactant in rigid polyurethane foams |
| topic | Thermal properties rigid polyurethane foam (RPUF) cell structure compression strength thermal conductivity |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0000533&mi=cd |