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rblegend
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3Â¥2012-04-03 18:07:28
punkee
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sdzzdz
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8Â¥2012-04-05 09:56:23
sdzzdz
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Angew. Chem. Int. Ed. 2005, 44, 7053 ¨C7059 Resol precursor preparation: A soluble low-molecular-weight polymer (Mw=500¨C5000) derived from phenol and formaldehyde (resol) was prepared by a basic polymerization method.T ypical preparation procedure: Phenol (0.61 g, 6.50 mmol) was melted at 40¨C428C before 20% NaOH (aq; 0.13 g, 0.65 mmol) was added slowly over 10 min with stirring.F ormalin (37 wt%, 1.05 g) containing formaldehyde (13.0 mmol) was added dropwise, and the reaction mixture was stirred at 708C for 60 min.After cooling the mixture to room temperature, the pH of the reaction mixture was adjusted to neutral (7.0) using 0.6m HCl solution.W ater was then removed under vaccum below 508C.T he final product (Mw<500 measured by GPC) was redissolved in ethanol before use. |
9Â¥2012-04-05 20:02:58
zjchen69
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10Â¥2012-04-06 10:27:04













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