Li-Yao Dai,Jin-Sheng Sun,Kai-He Lv,Ying-Rui Bai,Bo Liao,Dong-Qing Yang,Chao-Zheng Liu,Mei-Chun Li
Fractures in geological formations, which are commonly encountered during oil and gas exploration, pose significant challenges by facilitating fluid loss and reducing wellbore stability. Polymer gels hold significant promise as lost circulation materials due to their excellent deformability under pressure and self-adaptability. However, conventional gels face certain limitations, such as poor retention of gel-forming suspensions in fractures, low structural strength, and instability at high temperatures. These issues result in low pressure-bearing capacity and, consequently, reduced effectiveness in sealing formation fractures. This study presents the synthesis of a supramolecular polymer gel (SPG) composed of acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), divinylbenzene (DVB), polyvinyl alcohol (PVA), TEMPO-oxidized cellulose nanofibers (CNFs), and laponite via in situ radical polymerization. Due to the synergistic effects of hydrogen bonding and electrostatic interactions, the supramolecular polymer gel-forming suspension exhibits high retention capacity in fractures. The as-synthesized gels demonstrate remarkable temperature resistance and high mechanical strength, attributed to covalent bonding, multiple hydrogen bonding, and electrostatic interactions, along with the high aspect ratio and modulus of CNFs and laponite. This study broadens the application scope of CNFs, laponite, and SPGs, offering a novel approach for the efficient development of unconventional oil and gas resources.
Minmin Chen,Linlin Li,Wei Ji,Wensheng Lu,Xiaochao Tang,Suwei Jiang,Hualin Wang
Petroleum-based food packaging causes substantial environmental damage through waste accumulation and microplastic pollution. Therefore, replacing it with biodegradable polymers to extend the shelf life of food products is highly desirable. In this work, a bilayer functional composite with barrier properties and antimicrobial activity was developed for pork preservation. The outer barrier layer of gelatin/laponite (Ge/La) was fabricated by the casting method, while the inner antimicrobial layer of zein/eugenol (ZN/Eu) was prepared through direct electrospinning on Ge/La. The incorporation of La enhanced the thermal stability, mechanical strength, and moisture barrier of the outer layer, while the encapsulation of Eu endowed the inner layer with excellent antioxidant and antimicrobial activities. Furthermore, the Eu release from ZN/Eu fibers was found to follow Fickian diffusion. The bilayer composite of Ge/La@ZN/Eu can prolong pork shelf life by 1 d at 25 °C, demonstrating its great potential in active food packaging
危险品化学品经营许可证（带存储）