Polyhydroxybutyrate as an Eco‐Friendly Alternative of Synthetic Plastics

Sharma, Sucheta; Sharma, Priyanka; Sharma, Vishal; Bajaj, Bijender Kumar

doi:10.1002/9781119525899.ch6

Cited by 13 publications

(9 citation statements)

References 142 publications

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“…When BnOH was then introduced, nitrogen proton (a) was further deshielded, and its shift (8.83 ppm) was closer to that of TU-1 itself. In the corresponding 13 C NMR spectra, the carbonyl peak 1 of TU-1 detected at 181.25 ppm was identical to that of TU-1 alone, indicating that the thiourea structure was maintained. Whereas, the phenyl carbon (marked by 2) linking with the thiourea group was obviously shifted from the initial 143.41 to 140.36 ppm.…”

Section: ■ Results and Discussionmentioning

confidence: 89%

“…When [NHC-1]/[TU-1] = 0.5:0.5 was mixed in d 8 -THF, the proton of the nitrogen (marked by a) disappeared at the initial 8.98 ppm, and a broad peak associated with the other proton b was simultaneously upshifted to 8.56 ppm (Figure 4A). Accordingly, the carbonyl peak of TU-1 (peak 1) displayed an upfield shift to 163.93 ppm in its 13 C NMR spectrum (Figure 4B). Such shift change indicated that the deprotonation of TU-1 by the interaction of equivalent NHC-1 produced the thiomidate anion.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…These green polymers, which range from small molecules to polymer materials to biomass, under appropriate active conditions after their intended use, represent one possible end-of-life solution. , As concerns about the environmental and biosafety impact of used polymers increase, there is sustained interest in the lifecycle of polymeric materials. A series of aliphatic polyesters, including poly(lactic acid) (PLA), − poly(glycolic acid), − poly(caprolactone), and polyhydroxybutyrate, − have been successfully developed as sustainable and degradable polymers. The introduction of an aromatic ring pendant into the backbone through the ring-opening polymerization (ROP) of mandelide , has produced a polyester as an alternative to nondegradable polystyrene.…”

Section: Introductionmentioning

confidence: 99%

“…NMR spectra of interaction between NHC-1, TU-1 varying the feed ratios. (A) 1 H NMR; (B)13 C NMR in d 8 -THF.…”

mentioning

confidence: 99%

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Facile Synthesis of Aromatic Polyesters with High Molecular Weights via Lewis Pair-Mediated Ring-Opening Polymerization of Salicylic Acid-Derived O-Carboxyanhydrides

Liang,

Meng,

Yang

2023

Macromolecules

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Compared to fossil resources, which display limited degradability, exploring novel green polyesters as more sustainable alternatives is an extremely challenging task. In this study, we have developed an effective pathway from natural origin salicylic acid (SA) to poly(salicylic acid) (PSA) with high molecular weight. This was achieved by employing Lewis pair-mediated ring-opening polymerization of salicylic acid O-carboxyanhydrides (SAOCA). We identified two metal-free combinations, namely, 1,3-bis(2,6-diisopropylphenyl)imidazole (NHC-1)/N-[3,5-bis(trifluoromethyl)phenyl]-N′-cyclohexyl thiourea (TU-1) and 2-tertbutylimino-2-diethylamino-1,3-dimethyl-perhydro-1,3,2 diazaphosphorine (BEMP)/TU-1, that mediated ROP of SAOCA at room temperature within 100 min and successfully produced PSA with molecular weight greater than 150 kDa. We observed that the phase state of the polymerization solution switched from clarification to turbidity to phase separation when the PSA chain was growing up. Based on the NMR results of the interaction between organic base and TU-1, the analysis of polymerization kinetics, and DFT calculations, we found that the excess addition of TU-1 could effectively restrain unfavorable results in which very fast propagation of the polymerization chain caused phase separation in a short time. Furthermore, it improved the controllability of ROP reactions and the resulting chain length of PSA. The generality of this synthetic strategy was evaluated by the convenient preparation of other PSA-series polyesters via the ROP of SAOCA analogues varying the substituents. The obtained PSA-series polyesters exhibited good thermal stability and high glass transition temperature, outperforming some commodity polyolefins. This synthetic method paves the way for a better understanding of PSA-based polyesters as a class of future green materials applicable in the field of biomedicine and sustainable plastic packaging.

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Section: ■ Results and Discussionmentioning

confidence: 89%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…NMR spectra of interaction between NHC-1, TU-1 varying the feed ratios. (A) 1 H NMR; (B)13 C NMR in d 8 -THF.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Facile Synthesis of Aromatic Polyesters with High Molecular Weights via Lewis Pair-Mediated Ring-Opening Polymerization of Salicylic Acid-Derived O-Carboxyanhydrides

Liang,

Meng,

Yang

2023

Macromolecules

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“…The processed lignocellulosic biomass after several rounds of steps including pretreatment, enzymatic saccharification act as a suitable substrate for the production number of bioproducts such as biofuels, bioplastics, vanillin, hydroxymethylfurfural, etc. (Figure 4) [1, 3,96,112].…”

Section: Bioconversion Of Lignocellulosic Biomass Into Biofuels and V...mentioning

confidence: 99%

Valorization of Lignocellulosic Biomass into Biofuels and Value-Added Products for Sustainable Environment: A Comprehensive Review

Sharma¹,

Tsai²,

Sharma³

et al. 2022

Preprint

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An upsurge in global population over the years and rapid urbanization have accelerated huge dependence on petroleum-derived fuels and consequent environment concerns owing to green-house gas emissions in the atmosphere. An integrated biorefinery uses lignocellulosic feedstock as raw material for the production of renewable biofuels, and other fine chemicals. The sustain-able bio-economy and the biorefinery industry would benefit greatly from the effective use of lignocellulosic biomass obtained from agricultural feedstocks to replace petrochemical products. Lignin, cellulose, hemicellulose, and other extractives, which are essential components of ligno-cellulosic biomass, must be separated or upgraded into useful forms in order to fully realize the potential of biorefinery. The development of low-cost and green pretreatment technologies with effective biomass deconstruction potential is imperative for an efficient bioprocess. The abun-dance of microorganisms along with their continuous production of various degradative en-zymes makes them suited for the environmentally friendly bioconversion of agro-industrial wastes into viable bioproducts. The present review highlights the concept of biorefinery, ligno-cellulosic biomass and its valorization by green pretreatment strategies into biofuels and other biochemicals. The major barriers and challenges in bioconversion technologies, environmental sustainability of the bioproducts and promising solutions to alleviate those bottlenecks are also summarized.

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Transition from Linear to Circular Bioeconomy for the Sustainable Production of Green Chemicals

Nargotra,

Bajaj,

Singhania

et al. 2024

Bioeconomy for Sustainability

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Polyhydroxybutyrate as an Eco‐Friendly Alternative of Synthetic Plastics

Cited by 13 publications

References 142 publications

Facile Synthesis of Aromatic Polyesters with High Molecular Weights via Lewis Pair-Mediated Ring-Opening Polymerization of Salicylic Acid-Derived O-Carboxyanhydrides

Facile Synthesis of Aromatic Polyesters with High Molecular Weights via Lewis Pair-Mediated Ring-Opening Polymerization of Salicylic Acid-Derived O-Carboxyanhydrides

Valorization of Lignocellulosic Biomass into Biofuels and Value-Added Products for Sustainable Environment: A Comprehensive Review

Transition from Linear to Circular Bioeconomy for the Sustainable Production of Green Chemicals

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