Herein, the interaction between partially hydrolyzed polyacrylamide (HPAM) and urea (UR) in an aqueous solution was characterized via differential scanning calorimetry (DSC) and two-dimension correlation spectra (2DCOS). The rheological properties of the HPAM solution (2000 and 2500 mg L?1) were studied as a function of the addition of the UR content (50, 100, 200, 300, and 400 mg L?1). The results indicate that the HPAM/UR solution exhibits higher intrinsic viscosity, apparent viscosity, first normal stress difference, and modulus than the HPAM solution due to the larger hydraulic size of HPAM in the aqueous solution. From the DSC and 2DCOS results, a stronger hydrogen bonding interaction between carbonyl and amino groups was observed in the vicinity of 45 °C. Dynamic light scattering (DLS) was employed to directly analyze the hydrodynamic diameter, and it further confirmed that a certain amount of UR enabled the blending solution to increase the hydraulic size. Moreover, an interplay model was put forward based on the rheology and dynamic light scattering data.
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机译：本文通过差示扫描量热法（DSC）和二维相关光谱（2DCOS）表征了部分水解聚丙烯酰胺（HPAM）与尿素（UR）在水溶液中的相互作用。研究了HPAM溶液（2000和2500 mg L ？1 ）的流变性质与UR含量（50、100、200、300）的关系。和400 mg L ？1 ）。结果表明，由于水溶液中HPAM的水力较大，HPAM / UR溶液比HPAM溶液具有更高的特性粘度，表观粘度，第一法向应力差和模量。根据DSC和2DCOS结果，在45°C附近观察到羰基和氨基之间的氢键相互作用更强。使用动态光散射（DLS）直接分析流体动力学直径，并进一步证实一定量的UR使混合溶液能够增加水力尺寸。此外，基于流变学和动态光散射数据，提出了相互作用模型。
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