Tough, Notch-Insensitive, Heat-Resistant Hydrogels Constructed by Vinylated Polylysine for Temporary Oilfield Water Plugging

自愈水凝胶 材料科学 聚丙烯酰胺 复合材料 化学工程 聚合物 高分子化学 工程类
作者
Qiongjun Xu,Rui Wu,Zhaoyang Yuan,Liang Hao,Shuhui Yu,Hu Xu,Haitao Wu,Jian Zheng,Jinrong Wu
出处
期刊:Industrial & Engineering Chemistry Research [American Chemical Society]
卷期号:62 (44): 18484-18492
标识
DOI:10.1021/acs.iecr.3c02851
摘要

Polyacrylamide hydrogels make up a category of widely used oilfield water-plugging agents. However, their poor mechanical properties and insufficient heat resistance severely limit their applications. In this work, a novel strategy for the construction of tough and heat-resistant polyacrylamide hydrogels using vinylated modified polylysine (PLL) as a multifunctional cross-linker (named APLL) is proposed. The multifunctionality of APLL leads to a three-dimensional network of hydrogels containing a uniform network structure that distributes stress and a dynamic cross-linked structure that dissipates energy. Meanwhile, APLL retains the thermal stabilization properties of PLL, and its use as a cross-linking site in the polymer network can effectively improve the heat resistance of hydrogels. As a result, hydrogels exhibit ultrastretchability to 3295%, excellent notch-insensitivity (75% prefabricated notched samples still have a fracture energy of 15,728 J/m2), and good heat resistance (better aging performance than N, N-methylene bis-acrylamide cross-linked hydrogels at 130 °C). In addition, the saline suspension composed of preformed gel particles of APLL cross-linked hydrogels can age at 80 °C for more than 10 days and effectively seal the pores with a sealing rate of 95% in percolation experiments. Such mechanical properties, notch insensitivity, and heat resistance enable the APLL cross-linked hydrogels to serve as a potential temporary water-plugging agent for heterogeneous reservoirs of the oilfield.
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