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This activity is temporarily suspended. The reason is Dr. Sudhir is very busy.
06/10/2024
P-1
P-2
P-3
been busy recently but will do it once I get time!
22/09/2024
P-1
Boosting methanolysis of polycarbonate (PC) for bisphenol A recovery from end-of-life PC and PC/ABS blend - CEJ 2024
P-2
New advance in biorenewable FDCA-based polyesters: Multiple scale-up from lab bench to pilot plant - CEJ 2023
P-3
Depolymerization of waste polyethylene to linear alkenes via sequential dehydrogenation and metathesis - GC 2024
P-1: The challenges in PC depolymerization were discussed, with comparisons made among various methods in the literature. A systematic explanation of their methods was provided, and they also investigated the E-factor of both the literature methods and their own. A conclusion was drawn based on the data, revealing that the environmental energy impact factor (ξ) of their method is very low.--------
P-2: Background: Avantium’s newly launched FDCA and PEF production line is a significant boost for the future of the sustainable, bio-based plastic industry. Often, industries do not release systemic scale-up data for polymeric materials while developing new polymers. Researchers can understand this, but for the few curious individuals interested in the property variations that can occur from lab-scale reactions to multi-kilo batch reactions, there’s a paper published in 2023 that you should read.
In this paper, they have systematically increased the batch size from 100 mL to 150 L reactor. A gradual increment was noted with increasing batch size, for example, higher η (0.62 - 79 dL/g), higher Tg (82 - 84 ℃), and higher tensile strength (58 - 81 MPa) were observed.--------
P-3: Breaking the C-C bond or C-H bond in Polyethylene (PE) or Polypropylene (PP) is energy intensive as they require higher bond-breaking energies. For example, the dissociation enthalpy of the C–C bond is 362–369 kJ/mol and for the C–H bond 416.7 kj/mol. In this work, Chikkali et al., have prepared two PCP-type iridium complexes and studied their catalytic efficiencies to convert PE to dehydrogenated polyethynes (DHP). The DHP was then converted to shorted chains using the HG-II type catalyst in ethylene. As a result, they obtained dodecenes. I think this is an important finding as it can avoid the isomerization step (J. Am. Chem. Soc. 2022, 144, 18526−18531).---------Thanks to all the authors!
P-2: Background: Avantium’s newly launched FDCA and PEF production line is a significant boost for the future of the sustainable, bio-based plastic industry. Often, industries do not release systemic scale-up data for polymeric materials while developing new polymers. Researchers can understand this, but for the few curious individuals interested in the property variations that can occur from lab-scale reactions to multi-kilo batch reactions, there’s a paper published in 2023 that you should read.
In this paper, they have systematically increased the batch size from 100 mL to 150 L reactor. A gradual increment was noted with increasing batch size, for example, higher η (0.62 - 79 dL/g), higher Tg (82 - 84 ℃), and higher tensile strength (58 - 81 MPa) were observed.--------
P-3: Breaking the C-C bond or C-H bond in Polyethylene (PE) or Polypropylene (PP) is energy intensive as they require higher bond-breaking energies. For example, the dissociation enthalpy of the C–C bond is 362–369 kJ/mol and for the C–H bond 416.7 kj/mol. In this work, Chikkali et al., have prepared two PCP-type iridium complexes and studied their catalytic efficiencies to convert PE to dehydrogenated polyethynes (DHP). The DHP was then converted to shorted chains using the HG-II type catalyst in ethylene. As a result, they obtained dodecenes. I think this is an important finding as it can avoid the isomerization step (J. Am. Chem. Soc. 2022, 144, 18526−18531).---------Thanks to all the authors!
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