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| Titel: |
A Novel Ultrasonic Method of Preparation of Polyurethane Materials |
| Auteur: |
Balasubramanian, Maridass Paglicawan, Marissa A. Kim, Jin Kuk |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 57 (2008) nr. 8 pagina's 832-839 |
| Jaar: |
2008-08 |
| Inhoud: |
The possibility of using ultrasonic waves in the reaction between methylene diphenyl diisocyanate (MDI) and polypropylene glycol (PPG) to create polyurethanes is described in this article. This normally slow reaction without chemical catalysts was found to occur to completion within minutes in the presence of ultrasonic waves. A commercially available ultrasonic apparatus was used and characterized for the ultrasonic power. The effect of varying the isocyanate/alcohol groups (NCO/OH) ratio in the presence of ultrasonic waves was also studied. These ratios were found to have a strong effect on the reaction time and mechanical properties of the materials. They also influence the thermal stabilities of the products. Higher NCO/OH ratios lead to faster curing times and harder but brittle materials. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 1 van 7 gevonden artikelen
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