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Chemical Structure| 4437-85-8

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Maynard, Ryan K ; Patel, Kush G ; Wu, Huiming ; Knudsen, Frida C ; Ross, Imrie C ; Winfield, DeMichael D , et al.

Abstract: Semiaromatic polyesters derived from petroleum are an important class of polymers that encompass a wide variety of thermal and mechanical properties. Unfortunately, replacing the aromatic component with cost-competitive bioderived monomers is an ongoing challenge. This work describes the synthesis of nine different polyesters made from AB monomers that can be derived from lignin, starting with phloretic, coumaric, and ferulic acids and similar derivatives. The polyesters were synthesized at >50 g scale, and full characterization of the thermal, mechanical, and rheological properties is included. The polymers exhibit excellent thermal stability, a Tg range of 16−65 °C, tensile moduli ranging from 4.6 to 1200 MPa, and elongation at break ranging from 7.5% to greater than 3800%. To examine the effects of structural permutations among the polymer series, TTS master curves were constructed for seven polyesters using melt rheology. Properties such as packing length and characteristic ratio are described and compared among the series. Finally, it is demonstrated that these polyesters are easily chemically recycled to monomer in high yield.

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Abraha, Yuel W. ; Jacobs, Francois J. F. ; Brink, Alice ; Langner, Ernst H. G. ;

Abstract: Direct mixing (de novo) and Solvent Assisted Ligand Exchange (SALE) are the main methods used for the synthesis of Mixed-Linker Zeolitic Imidazolate Frameworks (ML-ZIFs). ML-ZIFs with combined -NO2 and -Br/-Cl functionalities were prepared via both synthetic routes. Thereafter the CO2 uptake of the ML-ZIFs were compared, as well as their abilities to fixate CO2 with epoxide substrates. The de novo synthesis resulted in ML-ZIFs with SOD topologies, 60: 40 (-NO2: -Br/-Cl) functionality ratios, higher porosities, better thermal stability and higher CO2 uptake than equivalent SALE products. SALE resulted in smaller ML-ZIF crystallites, only ∼ 10% incorporation of -Br/-Cl functionalized imidazolate linkers, and phase change during activation. ML-ZIF-7Cl, obtained from direct mixing, resulted in the highest CO2 uptake (90 cm3 g-1), in line with its higher porosity. ML-ZIF-7Cl, in combination with tetrabutylammonium bromide (TBAB), showed a high catalytic activity (TOF of 446 h-1) for the fixation of CO2 with propylene oxide and was reusable for up to 4 cycles without loss in activity.

Keywords: Zeolitic imidazolate frameworks (ZIFs) ; Solvent assisted ligand exchange (SALE) ; De Novo synthesis ; CO2 uptake ; CO2 fixation

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Product Details of [ 4437-85-8 ]

CAS No. :4437-85-8
Formula : C5H8O3
M.W : 116.12
SMILES Code : O=C1OCC(CC)O1
MDL No. :MFCD00143317
InChI Key :ZZXUZKXVROWEIF-UHFFFAOYSA-N
Pubchem ID :107282

Safety of [ 4437-85-8 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H315-H319
Precautionary Statements:P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313
 

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