Surface and thermodynamic parameters of polymeric surfactants from recycled poly(ethylene terephthalate)

2007 ◽  
Vol 56 (8) ◽  
pp. 984-995 ◽  
Author(s):  
Ayman M Atta
Keyword(s):  
Thermodynamic Parameters ◽  
Ethylene Terephthalate ◽  
Polymeric Surfactants ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

scholarly journals Determination of key-thermodynamic parameters using a kinetic modeling approach to describe the post-consumer poly(ethylene terephthalate) hydrolysis catalyzed by cutinase from Humicola insolens

2021 ◽  
Author(s):  
Erika de Queiros Eugenio ◽  
Ivone Sampaio Pereira Campisano ◽  
Aline Machado de Castro ◽  
Maria Alice Zarur Coelho ◽  
Marta Antunes Pereira Langone
Keyword(s):  
Kinetic Model ◽  
Thermodynamic Parameters ◽  
Ethylene Terephthalate ◽  
Activation Entropy ◽  
Arrhenius Law ◽  
Humicola Insolens ◽  
Poly Ethylene Terephthalate ◽  
Reliable Parameter ◽  
Poly Ethylene

Abstract The search for a straightforward technology for post-consumer poly(ethylene terephthalate) (PC-PET) degradation is essential to develop a circular economy. In this context, PET hydrolases such as cutinases can be used as bioplatforms for this purpose. Humicola insolens cutinase (HiC) is a promising biocatalyst for PC-PET hydrolysis. Therefore, this work evaluated a kinetic model, and it was observed that the HiC seems not to be inhibited by any of the main PET hydrolysis products such as terephthalic acid (TPA), mono-(2-hydroxyethyl) terephthalate (MHET), and bis-(2-hydroxyethyl) terephthalate (BHET). The excellent fitting of the experimental data to a kinetic model based on enzyme-limiting conditions validates its employment for describing the enzymatic PC-PET hydrolysis using two-particle size ranges (0.075-0.250, and 0.250-0.600 mm) and temperatures (40, 50, 55, 60, 70, and 80 ºC). The Arrhenius law provided a reliable parameter (activation energy of 98.9 ± 2.6 kJ mol −1 ) for enzymatic hydrolysis, which compares well with reported values for chemical PET hydrolysis. The thermodynamic parameters of PC-PET hydrolysis corresponded to activation enthalpy of 96.1 ± 3.6 kJ mol -1 and activation entropy of 10.8 ± 9.8 J mol -1 K -1 . Thus, the observed rate enhancement with temperature was attributed to the enthalpic contribution, and this understanding is helpful to the comprehension of enzymatic behavior on hydrolysis reaction.

Nanostructured ZnO and CuI Thin Films on Poly(Ethylene Terephthalate) Tapes for UV-Shielding Applications

2020 ◽  
Vol 12 (3) ◽  
pp. 03007-1-03007-8
Author(s):  
N. P. Klochko ◽  
◽  
K. S. Klepikova ◽  
D. O. Zhadan ◽  
V. R. Kopach ◽  
...  
Keyword(s):  
Thin Films ◽  
Ethylene Terephthalate ◽  
Uv Shielding ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Dynamic rheology of branched poly(ethylene terephthalate)

2000 ◽  
Vol 49 (2) ◽  
pp. 203-208 ◽  
Author(s):  
Ruxandra F Rosu ◽  
Robert A Shanks ◽  
Sati N Bhattacharya
Keyword(s):  
Ethylene Terephthalate ◽  
Dynamic Rheology ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene
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