Preparation and Properties of HBP-g-PEGDGE Gel Polymer
A class of HBP-g-PEGDGE(HPD)hydrogel were prepared by solution method using hyperbranched macromolecular-broom polymer(HBP-NH2)and linear diepoxide terminated polyethylene glycol(PEGDGE,Mn=600,1000,2000)as raw materials.The structure of the product was characterized by Fourier transform infrared spectroscopy,hydrogen nuclear magnetic resonance spectroscopy,ultraviolet spectrum,and scanning electron microscopy,and its swelling,thermal stability,rheology,and water-plugging properties were evaluated.The results show that the HPD hydrogel has a three-dimensional network structure,and the pore size gradually increases with the increase of molecular weight of PEG.For long-chain PEGDGE,lower temperature,acidic pH,and higher equilibrium swelling ratios in the absence of salt,the hydrogels show good swell-shrinkage reversibility at temperatures ranging from 10℃to 60℃and pH values ranging from 2 to 12.The thermal stability of the gels is good and increased with the increase of molecular weight of PEG.With the increase of molecular weight of PEG,the storage and loss modulus decrease.The closure rate is 99%,and the closure effect is good.
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