Polyureas Versatile Polymers for New Academic and Technological Applications

A thiourea hexamethylene diisocyanate covalent organic framework (TH COF) was synthesized by adjusting the surface charge and surface area. The surface charge value of TH COF, −3.8 ± 0.5 mV, can be changed to −29.1 ± 0.4 mV by treatment with NaOH (dp-TH) and 17.1 ± 1.0 mV by treatment with HCl (p-TH). Additionally, the surface area of TH COF was 39.3 m2/g, whereas the surface area of dp-TH COF and p-TH COF structures were measured as 41.4 m2/g and 42.5 m2/g, respectively. However, the COF structure had a better adsorption capability with acid and base treatments, e.g., dp-TH COF absorbed 5.5 ± 0.3 mg/g methylene blue (MB) dye, and p-TH COF absorbed 25.9 ± 1.4 mg/g methyl orange (MO) dye from 100 mL 25 ppm aqueous dye solutions, thereby increasing the MB and MO absorption amounts of the TH COF structure. Furthermore, by calculating the distribution, selectivity, and relative selectivity coefficients, the absorption capacity order was determined as dp-TH > TH > p-TH COFs for the MB dye, whereas it was p-TH > TH > dp-TH COFs for the MO dye. Finally, the reusability of dp-TH COF for MB absorption and p-TH COF for MO absorption were investigated. After five repeated uses, dp-TH COF retained 64.6 ± 3.7% of its absorption ability, whereas p-TH COF preserved 79.7 ± 3.2% of its absorption ability relative to the initial absorption amount.

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“…The reactions of isocyanates against nucleophilic groups under moderate conditions are reported below [37][38][39][40][41].…”

Section: Synthesis and Characterization Of Th-based Cofsmentioning

confidence: 99%

Thiourea-Isocyanate-Based Covalent Organic Frameworks with Tunable Surface Charge and Surface Area for Methylene Blue and Methyl Orange Removal from Aqueous Media

et al. 2022

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“…Alongside making the previously mentioned linear NIPUs, Deepa et al conducted the polyaddition of dicarbamates with diamines to produce linear PUas, and Koning and co-workers employed a non-metal TBD catalyst to prepare similar materials. 1372,1392 An excellent review on the current state of polyurea research was recently published by Santana et al 1393 The work of Shi et al and other similar works have highlighted the exceptional potential for the catalyst-free preparation of bio-based NIPUas directly from a diamine and CO 2 , requiring only elevated temperatures and pressurized CO 2 . 1373 Here, the potential for bio-based NIPUas is believed to further expand as additional bio-based diamines are developed and commercialized.…”

Section: Polyamidesmentioning

confidence: 99%

“…As mentioned, one such method is the production of dicarbamates from the reaction of bifunctional cyclic carbonates, and the subsequent reaction with a diamine. Alongside making the previously mentioned linear NIPUs, Deepa et al conducted the polyaddition of dicarbamates with diamines to produce linear PUas, and Koning and co-workers employed a non-metal TBD catalyst to prepare similar materials. , An excellent review on the current state of polyurea research was recently published by Santana et al . The work of Shi et al .…”

Section: Bisfunctional Monomers Used In the Synthesis Of Commodity Th...mentioning

confidence: 99%

Polymers without Petrochemicals: Sustainable Routes to Conventional Monomers

et al. 2022

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Access to a wide range of plastic materials has been rationalized by the increased demand from growing populations and the development of high-throughput production systems. Plastic materials at low costs with reliable properties have been utilized in many everyday products. Multibillion-dollar companies are established around these plastic materials, and each polymer takes years to optimize, secure intellectual property, comply with the regulatory bodies such as the Registration, Evaluation, Authorisation and Restriction of Chemicals and the Environmental Protection Agency and develop consumer confidence. Therefore, developing a fully sustainable new plastic material with even a slightly different chemical structure is a costly and long process. Hence, the production of the common plastic materials with exactly the same chemical structures that does not require any new registration processes better reflects the reality of how to address the critical future of sustainable plastics. In this review, we have highlighted the very recent examples on the synthesis of common monomers using chemicals from sustainable feedstocks that can be used as a like-for-like substitute to prepare conventional petrochemical-free thermoplastics.

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“…[22] 14CHDO is also the prime industrial precursor to 1,4-cyclohexanedione [23] a highly versatile platform molecule to the production of pharmaceuticals such as the analgesic Cebranopadol. [24][25] The prime application of diamines such as 14CHDA is for the preparation of polyamides, [26][27] polyimides, [28] polyureas [29] , polyurethanes [30] and biologically active compounds (Figure 1A). [31][32] Industrially 14CHDO and 14CHDA are produced from fossil resources, relying on the use of benzene, a carcinogenic and mutagenic compound with a lengthy hazard classification by several strategies that are briefly summarized on (Figure 1B) and on Supplementary Note 1 in more details.…”

Section: Introductionmentioning

confidence: 99%