Evaluation of polyphenylene sulfide by surface thermodynamics approaches: Comparison with common polymers

The surface tension and viscosity values of N-methyldiethanolamine (MDEA) aqueous solutions promoted by tetramethylammonium arginate ([N1111][Arg]) were measured and modeled. The experimental temperatures were 303.2 to 323.2 K. The mass fractions of MDEA (wMDEA) and [N1111][Arg] (w[N1111][Arg]) were 0.300 to 0.500 and 0.025 to 0.075, respectively. The measured surface tension and viscosity values were satisfactorily fitted to thermodynamic models. With the aid of experimentally viscosity data, the activation energy (Ea) and H2S diffusion coefficient (DH2S) of MDEA-[N1111][Arg] aqueous solution were deduced. The surface entropy and surface enthalpy of the solutions were calculated using the fitted model of the surface tension. The quantitative relationship between the calculated values (surface tension, surface entropy, surface enthalpy, viscosity, activation energy, and H2S diffusion coefficient) and the operation conditions (mass fraction and temperature) was demonstrated.

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Investigation of the Effect of the Length and Content of Carbon Fibers on the Properties of Polyphenylene Sulfide

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.869.474 ◽

2020 ◽

Vol 869 ◽

pp. 474-480

Author(s):

Azamat L. Slonov ◽

Ismel V. Musov ◽

Elena V. Rzhevskaya ◽

Azamat Zhansitov ◽

Svetlana Yu. Khashirova

Keyword(s):

Mechanical Properties ◽

Impact Strength ◽

Heat Resistance ◽

Carbon Fibers ◽

Filler Content ◽

Sharp Decrease ◽

Polyphenylene Sulfide ◽

Average Particle ◽

Melt Flow Rate ◽

Particle Length

The article presents the results of a study of the effect of milled and chopped carbon fibers, with an average particle length of 0.2 and , respectively, on the mechanical properties of polyphenylene sulfide and its heat resistance. It was found that the introduction of carbon fibers leads to a significant decrease in the melt flow rate. It was shown that after a sharp decrease in impact strength at 10 % content of carbon fibers, its inverse improvement occurs with an increase in the filler content. Composites containing carbon fibers with length demonstrate higher impact strength. The introduction of a filler leads to a significant increase in the elastic modulus and strength of polyphenylene sulfide and its heat resistance.

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Biodegradation of bio-sourced and synthetic organic electronic materials towards green organic electronics

Nature Communications ◽

10.1038/s41467-021-23227-4 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Eduardo Di Mauro ◽

Denis Rho ◽

Clara Santato

Keyword(s):

Organic Electronics ◽

Electronic Materials ◽

Chemical Elements ◽

Electronic Devices ◽

Polyphenylene Sulfide ◽

Environmentally Benign ◽

Organic Electronic ◽

Synthetic Materials ◽

Organic Electronic Materials ◽

Thermophilic Conditions

AbstractUbiquitous use of electronic devices has led to an unprecedented increase in related waste as well as the worldwide depletion of reserves of key chemical elements required in their manufacturing. The use of biodegradable and abundant organic (carbon-based) electronic materials can contribute to alleviate the environmental impact of the electronic industry. The pigment eumelanin is a bio-sourced candidate for environmentally benign (green) organic electronics. The biodegradation of eumelanin extracted from cuttlefish ink is studied both at 25 °C (mesophilic conditions) and 58 °C (thermophilic conditions) following ASTM D5338 and comparatively evaluated with the biodegradation of two synthetic organic electronic materials, namely copper (II) phthalocyanine (Cu–Pc) and polyphenylene sulfide (PPS). Eumelanin biodegradation reaches 4.1% (25 °C) in 97 days and 37% (58 °C) in 98 days, and residual material is found to be without phytotoxic effects. The two synthetic materials, Cu–Pc and PPS, do not biodegrade; Cu–Pc brings about the inhibition of microbial respiration in the compost. PPS appears to be potentially phytotoxic. Finally, some considerations regarding the biodegradation test as well as the disambiguation of “biodegradability” and “bioresorbability” are highlighted.

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