以己二酸为扩链剂对DA10聚醚进行了改性 ,并用渤海原油对改性产物进行破乳评价 ,然后用红外光谱对反应进行了跟踪并对产物进行了结构表征 ,最后通过测定原料与产物对油水界面张力的影响 ,研究了扩链产物的破乳作用机理。结果表明 ,改性后的破乳剂的脱水性能明显增大 ,且随反应时间的增加 ,即相对分子质量的增大呈先增加后降低的趋势 ,与其对油水界面张力的降低趋势相一致 The polyether of DA10 was modified with adipic acid as chain extender, and the modified product was evaluated by emulsion breaking with Bohai crude oil. The reaction was followed by IR and the structure was characterized. Finally, And the effect of product on the interfacial tension of oil and water, the mechanism of demulsification of the chain extended product was studied. The results showed that the dewaterability of the modified demulsifier significantly increased, and with the increase of reaction time, the relative molecular mass increased first and then decreased, consistent with the decreasing tendency of the interfacial tension