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Trends in Polymer Applications
Published in Manas Chanda, Plastics Technology Handbook, 2017
Polyaspartates, as exemplified by the parent polymer, polyaspartic acid, offer an attractive biodegradable alternative to polyacrylates [29]. In addition to their activity as scale inhibitors and dispersants, polyaspartates have also been shown to have corrosion inhibition activity, particularly for the corrosion environments frequently found in oil-field applications. Polyaspartates have very high biodegradability as indicated by OECD guidelines for aquatic biodegradability.
Facile preparation of tertiary amine grafted poly (α,β-L-aspartic acid) with zwitterionic property to limit nonspecific protein adsorption
Published in Journal of Dispersion Science and Technology, 2021
Xiaojuan Wang, Hanqing Gu, Guolin Wu
In recent years, inspired by the composition, structure and performance of biofilm, researchers proposed to modify the surface of materials with one or several layers of zwitterions with similar structure to choline phosphate groups from the perspective of bionics.[11–13] Researches revealed that hydration layer[14] is formed on the surface of materials through solvation of charged end-group functional groups and hydrogen bonding, thus effectively preventing adsorption of proteins.[15] Choline phosphate polymer and betaine polymer are modified materials developed in recent years for surface modification of biomedical materials. Among them, carboxyl betaine polymers have many modifiable carboxyl groups,[16,17] so they are also widely used in the preparation of long-cycle multifunctional nano-drugs. However, these synthetic polymers lack the ability of natural metabolism and will also produce harmful degradation products.[15,17–21] In recent years, polyaspartic acid has been extensively studied due to its protein-like structure, biocompatibility, simple synthesis process and rich functionalization modification. At present, most of the researches on polyaspartic acid use the functionalization of its side chains to adjust the hydrophilic/hydrophobic ratio of polymers to obtain more excellent polymers.[22–25] However, using the pH-responsiveness of polyaspartic acid itself, the research on the construction of responsive surface modification materials is still relatively few.
Research progress on scaling mechanism and anti-scaling technology of geothermal well system
Published in Journal of Dispersion Science and Technology, 2023
Huijun Zhao, Yahong Huang, Song Deng, Lei Wang, Haoping Peng, Xin Shen, Dingkun Ling, Lu Liu, Yuan Liu
Polyaspartic acid (PASP) has the characteristics of biodegradation, chelation and dispersion, and is considered to be a multifunctional polymer environmentally friendly material.[66–69] Migahed et al.[70] synthesized polyaspartic acid derivatives such as Gly-PASP, and tested their performance as scale inhibitors by complexometric titration with EDTA standard solutions. The inhibition efficiency diagram of the scale inhibitor at different concentrations is shown in Figure 3A. Yuan et al.[71] synthesized an environmentally friendly curcumin-citric acid-aspartic acid polymer (PCCA) scale and corrosion inhibitor using a solvent-free and catalyst-free green synthesis method. The analysis results showed that PCCA has good thermostatic properties. The synthetic route is shown in Figure 3B. Zhang et al.[72] synthesized modified polyaspartic acid scale inhibitors Trp-SA-PASP and Tyr-SA-PASP by graft copolymerization with sulfamic acid on PASP and applied them to inhibit calcium sulfate scale in cooling water. Then the scale inhibition performance evaluation proved that Tyr-SA-PASP and Trp-SA-PASP are two cost-effective scale inhibitors for calcium sulfate scale: compared with PASP and two commercial scale inhibitors JH-907 and PAPEMP, the two modified PASP scale inhibitors exhibit higher inhibition performance due to the coordination effect of deprotonation. The DFT calculation results are shown in Figure 3Ca,b,c,d. Figure 3Ce,f show the results of the scale inhibition performance measurement and XRD spectra, respectively. Fu et al.[74] used β-cyclodextrin intermediates and polysuccinimide (PSI) as raw materials to synthesize polyaspartic acid graft copolymers (PASP/β-CD) and studied their scale inhibition mechanism. Chen et al.[73] synthesized a new and efficient polyaspartic acid/graphene oxide graft copolymer (PASP/GO) through chemical modification and evaluated its scale inhibition performance. Figure 3Da shows the synthetic route, Figure 3Db shows the possible scale inhibition mechanism of the scale inhibitor.