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秋秋愛鐵蟲 (初入文壇)
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[求助]
熱固性酚醛樹脂的合成
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| 熱固性酚醛樹脂的合成,甲階水溶性的 |



鐵蟲 (小有名氣)

木蟲 (小有名氣)
木蟲 (著名寫手)
OUT小城,IN故事

鐵蟲 (初入文壇)

鐵蟲 (初入文壇)

木蟲 (小有名氣)
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Angew. Chem. Int. Ed. 2005, 44, 7053 –7059 Resol precursor preparation: A soluble low-molecular-weight polymer (Mw=500–5000) 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 40–428C 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. |

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