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A study on grafting and characterization of HMDI-modified calcium hydrogenphosphate by Guo-Chung Dong; Jui-Sheng Sun; Chun-Hsu Yao; George J. Jiang; Chin-Wang Huang; Feng-Huei Lin is a Engineering article available to read on EtoBox.

What is A study on grafting and characterization of HMDI-modified calcium hydrogenphosphate about?

It is known that the organic molecules can provide an effective means to manipulate the surface properties of the biodegradable ceramic. There are two ways to modify the surface of the biodegradable ceramic by organic molecules. The first one is through surface adsorption but organic molecules will easily be washed out in the physiological environment. The second approach is to graft organic molecules through covalent bond to the hydroxyl groups that are available on the surface of the ceramics. Isocyanate group has been reported as a coupling agent for hydroxyapatite and organic molecule. The studies showed that the isocyanate could react with hydroxyl groups of hydroxyapatite and form a covalent bond between isocyanate and hydroxyapatite. In the study, hexamethylene diisocyanate (HMDI) was used as coupling agent and calcium hydrogenphosphate (CaHPO4, CHP) was the candidate ceramic. CHP will react with HMDI at the temperature of 20 degrees C, 30 degrees C, 40 degrees C, 50 degrees C, 60 degrees C, and 70 degrees C for 4h. Dibutyltin dilaurate and hydroquinone were used as catalyst and inhibitor, respectively. The effect of reaction temperature on the grafted yield will be describe

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Author

Guo-Chung Dong; Jui-Sheng Sun; Chun-Hsu Yao; George J. Jiang; Chin-Wang Huang; Feng-Huei Lin

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0142-9612)

Published

2001

Language

EN

Field

Engineering (Physical Sciences)