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借助于界面扩张流变测量方法,研究了测量时间对超高分子量聚丙烯酰胺Mo 4 0 0 0溶液与十二烷形成界面的黏弹性特征;研究了Mo 4 0 0 0溶液浓度对界面扩张黏弹模量E的影响,探讨了Mo 4 0 0 0溶液与空气、十二烷、原油所形成界面的E特征.结果表明,同一浓度的Mo 4 0 0 0溶液与十二烷形成的E大小随测量时间而变化,初期E较小,随着测量时间的增长而逐渐增大直至达到平衡.在同一测量时间时,Mo 4 0 0 0溶液浓度愈大E愈大,达到平衡E的时间愈短.不同浓度时,初始E的差异大于平衡E的差异.由于Mo 4 0 0 0的黏均分子量高达2 .2×10 7,故弹性模量E′对E的贡献大,虽然随着溶液浓度的增大,黏性模量E″对E的贡献比例略有上升,但是弹性模量E′对E的贡献仍为主导.此外,Mo 4 0 0 0溶液与不同物质所形成的不同界面具有不同的黏弹性特征,与空气、十二烷、原油所形成界面的E的大小次序为E空气>E十二烷>E原油,即E的大小随两相密度差的减小而减小.
The viscoelastic properties of ultra-high molecular weight polyacrylamide Mo 4 0 0 0 solution and dodecane were investigated by means of interfacial rheological measurements. The effects of Mo 4 O 0 0 concentration on interfacial expansion E elastic modulus and the E characteristics of the interface formed by Mo 4 0 0 0 solution with air, dodecane and crude oil.The results show that the same concentration of Mo 4 0 0 0 solution and dodecane formation E size With the change of measurement time, the initial E is small, and gradually increases with the increase of measurement time until it reaches equilibrium. At the same measurement time, the greater the concentration of Mo 4 O 0 0, the greater the E, and the time to balance E Short at different concentrations, the difference of the initial E is greater than the difference of the equilibrium E. Since the viscosity average molecular weight of Mo 4 0 0 0 is as high as 2.2 × 10 7, the elastic modulus E ’contributes greatly to E although, The increase of concentration, the contribution of viscosity modulus E to E increased slightly, but the contribution of elastic modulus E ’to E still dominated. In addition, the different interface formed by Mo 4 0 0 0 solution with different materials With different viscoelastic characteristics, the order of the size of E with air, dodecane and crude oil is E Gas> dodecane E> E oil, i.e. E decreases with the size of the two-phase density difference decreases.