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一种疏水缔合丙烯酰胺共聚物的合成及流变性能评价 总被引:1,自引:0,他引:1
采用自由基胶束共聚法以丙烯酰胺(AM)和N-苄基-N-辛基丙烯酰胺(BOAM)为原料,合成了疏水缔合共聚物(AM-NaA-BOAM),并用红外光谱(FT-IR)和核磁共振(1H-NMR)表征了共聚物的结构.溶液的流变性实验表明,当共聚物浓度大于600 mg/L时,表现黏度显著增大,表现出疏水缔合行为,溶液的储能模量(G... 相似文献
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基于疏水缔合两亲聚合物具有良好的耐温抗盐性能,研究了以其为主剂的新型凝胶体系.利用黏度法筛选出体系的最优配方:两亲聚合物主剂的相对分子质量为750×10<'4>、浓度1000mg/L,交联剂乌洛托品、间苯二酚、助剂柠檬酸的最佳用量分别为0.3%、0.02%、O.3%(质量分数,下同),且最佳体系的储能模量G'大于损耗模... 相似文献
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储藏温度及保鲜包装薄膜对香菇品质的影响 总被引:4,自引:1,他引:3
目的研究储藏温度和包装材料对香菇品质的影响。方法采用高密度聚乙烯(HDPE)、复合膜(LDPE/HDPE)、低密度聚乙烯(LDPE)等3种保鲜薄膜材料制袋,并对香菇进行包装,在4,13,20℃等3种不同温度条件下储藏,测试香菇的失重率、硬度和呼吸速率等指标。结果在4,13,20℃条件下,香菇的新鲜度随时间增加明显下降,失重率逐渐增大,硬度逐渐降低。在20℃条件下,香菇品质变化最快,储藏4d即腐败变质;在13℃和4℃储藏条件下,储藏期分别达到7d和10d。3种薄膜材料对香菇的品质也有较大影响,HDPE保鲜效果最好,LDPE/HDPE次之,LDPE最差。结论在4℃储藏条件下,HDPE包装的香菇在相同储藏期内品质最佳。 相似文献
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The capability of hydrophobic association polymer(HAPAM) to displace oil is different from that of hydrolyzed polyacrylamide(HPAM) because they have different rheological properties.The viscoelasticity of five polymers was measured using Physica MCR301 rheometer and was compared.The five polymers include three HAPAMs with relative molecular mass of 1 248×104(TypeⅠ),750×104(TypeⅡ),and 571×104(Type Ⅲ) separately and two HPAMs with relative molecular mass of 1 200×104 and 3 800×104 respectively.The experiment results indicate that the viscoelasticity of HAPAM is better than that of HPAM.The storage modulus G’ and the loss modulus G″ for HAPAM solutions are also larger than those for HPAM.Comparing the rheological curves of different HAPAM types,it is found that the viscosity of typeⅡ and type Ⅲ is almost same at different shear rates while the viscosity of type I is the lower than that of Types Ⅱ and Ⅲ.The storage modulus G’ and the loss modulus G″ for three types of HAPAM were measured in low oscillation frequency range,and the results show that G’ is greater than G″ for all three different types of HAPAM,but their loss modulus is almost same,and the G’ is in the order of type Ⅱ>type Ⅲ>type I.In addition,the G’ and G″ increase with aging time for all three HAPAM solutions were stayed at different days.The viscoelasticity of type Ⅰ reaches the highest value when aging time is 9 d at 45 ℃,but it is 7 d for type Ⅱ and type Ⅲ.The different viscoelasticity properties can be attributed to self-organization supermolecule networks which is formed by hydrophobic association of HAPAM molecular and molecular chain entanglement. 相似文献
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矿化度影响HPAM溶液黏度机理 总被引:17,自引:0,他引:17
研究了矿化度对HPAM(部分水解聚丙烯酰胺)溶液流变性的影响,测定了电渗析器处理前后的油田污水、淡水、浓水配制的HPAM溶液的流变性,浓水对HPAM流变性影响最大;通过流变曲线拟合,确定了流变参数,矿化度越高,稠度系数越小,幂律指数越大。探讨了阴阳离子对HPAM溶液黏度的影响,阴离子对HPAM溶液黏度降低无贡献,阳离子是引起HPAM溶液黏度损失的主要原因,应用双电层理论深入探讨了阳离子浓度、电荷数及阳离子半径对HPAM分子构型的影响。得出了阳离子对HPAM分子构型的影响规律。 相似文献
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针对永平油田稠油粘度大、油层厚度薄、原始含油饱和度低及热采投产后产油量低的现状,筛选出一种能使稠油在地层中发生自发乳化的降粘剂,使稠油以较低粘度的乳状液被采出,从而提高稠油的采收率。针对不同乳化降粘剂对永平油田稠油的乳化效果评价结果表明,自发乳化降粘剂NS在质量分数为2%、温度为45℃的条件下,可将油水界面张力降至10-3mN/m数量级以下,并可完全自发乳化等体积的永平油田稠油,降粘率达99.74%。NS自发乳化驱油实验结果表明,经过后续水驱后,自发乳化驱的采收率在水驱基础上提高了38.18%。 相似文献