One‐Step Synthesis of Lignin‐Based Triblock Copolymers as High‐Temperature and UV‐Blocking Thermoplastic Elastomers

2021 ◽  
Author(s):  
Yi Wan ◽  
Jianghua He ◽  
Yuetao Zhang ◽  
Eugene Y.-X. Chen
Keyword(s):  
High Temperature ◽  
Triblock Copolymers ◽  
Thermoplastic Elastomers ◽  
Uv Blocking ◽  
One Step

scholarly journals Synthesis, Properties, and Biodegradability of Thermoplastic Elastomers Made from 2-Methyl-1,3-propanediol, Glutaric Acid and Lactide

Life ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 43
Author(s):  
Lamya Zahir ◽  
Takumitsu Kida ◽  
Ryo Tanaka ◽  
Yuushou Nakayama ◽  
Takeshi Shiono ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Glutaric Acid ◽  
Triblock Copolymers ◽  
Tensile Tests ◽  
Thermoplastic Elastomers ◽  
Proteinase K ◽  
Synthesis Properties

An innovative type of biodegradable thermoplastic elastomers with improved mechanical properties from very common and potentially renewable sources, poly(L-lactide)-b-poly(2-methyl-1,3-propylene glutarate)-b-poly(L-lactide) (PLA-b-PMPG-b-PLA)s, has been developed for the first time. PLA-b-PMPG-b-PLAs were synthesized by polycondensation of 2-methyl-1,3-propanediol and glutaric acid and successive ring-opening polymerization of L-lactide, where PMPG is an amorphous central block with low glass transition temperature and PLA is hard semicrystalline terminal blocks. The copolymers showed glass transition temperature at lower than −40 °C and melting temperature at 130–152 °C. The tensile tests of these copolymers were also performed to evaluate their mechanical properties. The degradation of the copolymers and PMPG by enzymes proteinase K and lipase PS were investigated. Microbial biodegradation in seawater was also performed at 27 °C. The triblock copolymers and PMPG homopolymer were found to show 9–15% biodegradation within 28 days, representing their relatively high biodegradability in seawater. The macromolecular structure of the triblock copolymers of PLA and PMPG can be controlled to tune their mechanical and biodegradation properties, demonstrating their potential use in various applications.

High-temperature CO2 adsorption by one-step fabricated Nd-doped Li4SiO4 pellets

2020 ◽  
pp. 128346
Author(s):  
Yuandong Yang ◽  
Shun Yao ◽  
Yingchao Hu ◽  
Jian Sun ◽  
Qiuwan Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Co2 Adsorption ◽  
One Step

One-Step Synthesis and Densification of Bulk YBa2Cu4O8/Ni Composite Superconductors

1989 ◽  
Vol 169 ◽  
Author(s):  
C. Gélinas ◽  
B. Champagne
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Oxygen Stoichiometry ◽  
Metal Composite ◽  
Consolidation Process ◽  
High Oxygen Pressure ◽  
Composite Superconductors ◽  
One Step ◽  
Stable Oxygen ◽  
Nickel Composites

The fabrication of bulk YBa2Cu307-x/metal composite superconductors is not easy because of the oxygen-temperature dependence of the YBa2Cu307-x phase (the socalled 123 phase). A loss of oxygen occurs during consolidation of these composites at high temperature and it is almost impossible to diffuse oxygen through the metallic envelope into the densified compound to restore the required oxygen content for superconductivity above 77K. To overcome this drawback, a one-step synthesis and consolidation process was used to produce YBa2Cu4O8/ nickel composites. The superconductive 124 phase has a more stable oxygen stoichiometry [1] and is synthesized under a high oxygen pressure at high temperature.

scholarly journals All-Polycarbonate Thermoplastic Elastomers Based on Triblock Copolymers Derived from Triethylborane-Mediated Sequential Copolymerization of CO2 with Various Epoxides

2020 ◽  
Vol 53 (13) ◽  
pp. 5297-5307 ◽  
Author(s):  
Mingchen Jia ◽  
Dongyue Zhang ◽  
Gijs W. de Kort ◽  
Carolus H. R. M. Wilsens ◽  
Sanjay Rastogi ◽  
...  
Keyword(s):  
Triblock Copolymers ◽  
Thermoplastic Elastomers

scholarly journals Electroanalytical Performance of Nitrogen-Doped Graphene Films Processed in One Step by Pulsed Laser Deposition Directly Coupled with Thermal Annealing

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 666 ◽  
Author(s):  
Florent Bourquard ◽  
Yannick Bleu ◽  
Anne-Sophie Loir ◽  
Borja Caja-Munoz ◽  
José Avila ◽  
...  
Keyword(s):  
High Temperature ◽  
Pulsed Laser Deposition ◽  
Graphene Film ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Synthesis Process ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
One Step

Graphene-based materials are widely studied to enable significant improvements in electroanalytical devices requiring new generations of robust, sensitive and low-cost electrodes. In this paper, we present a direct one-step route to synthetize a functional nitrogen-doped graphene film onto a Ni-covered silicon electrode substrate heated at high temperature, by pulsed laser deposition of carbon in the presence of a surrounding nitrogen atmosphere, with no post-deposition transfer of the film. With the ferrocene methanol system, the functionalized electrode exhibits excellent reversibility, close to the theoretical value of 59 mV, and very high sensitivity to hydrogen peroxide oxidation. Our electroanalytical results were correlated with the composition and nanoarchitecture of the N-doped graphene film containing 1.75 at % of nitrogen and identified as a few-layer defected and textured graphene film containing a balanced mixture of graphitic-N and pyrrolic-N chemical functions. The absence of nitrogen dopant in the graphene film considerably degraded some electroanalytical performances. Heat treatment extended beyond the high temperature graphene synthesis did not significantly improve any of the performances. This work contributes to a better understanding of the electrochemical mechanisms of doped graphene-based electrodes obtained by a direct and controlled synthesis process.

High temperature self-assembly one-step synthesis of a structurally ordered PtFe catalyst for the oxygen reduction reaction

2019 ◽  
Vol 55 (80) ◽  
pp. 12028-12031 ◽  
Author(s):  
Xiaoyan Gao ◽  
Siguo Chen ◽  
Jianghai Deng ◽  
Shumaila Ibraheem ◽  
Jia Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Self Assembly ◽  
Reduction Reaction ◽  
Assembly Strategy ◽  
One Step ◽  
Face Centered

Herein, we present a high-temperature self-assembly strategy that directly allows the transformation of adsorbed Pt(NH3)42+ and Fe3+ sources into structurally ordered face-centered tetragonal (fct)-PtFe alloy NPs (2.6 ± 0.2 nm).

scholarly journals One-step ultra-rapid fabrication and thermoelectric properties of Cu2Se bulk thermoelectric material

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10508-10519 ◽  
Author(s):  
Tiezheng Hu ◽  
Yonggao Yan ◽  
Si Wang ◽  
Xianli Su ◽  
Wei Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermoelectric Properties ◽  
Single Phase ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Thermoelectric Energy ◽  
Rapid Fabrication ◽  
One Step ◽  
First Time

Cu2Se is a promising material for thermoelectric energy conversion. Fully dense single-phase bulk Cu2Se was prepared by the combination of self-propagating high-temperature synthesis with in situ quick pressing for the first time.

A sintering burden blending model based on one-step optimization method and high-temperature characteristics of iron ore

2019 ◽  
Vol 116 (2) ◽  
pp. 211
Author(s):  
Shengli Wu ◽  
Xiaobo Zhai ◽  
Tiankai Song
Keyword(s):  
High Temperature ◽  
Iron Ore ◽  
Intelligent System ◽  
Quantitative Relationship ◽  
High Strength ◽  
Optimization Method ◽  
Temperature Characteristics ◽  
Positive Effects ◽  
One Step ◽  
The One

A sintering burden blending model is an intelligent system used to obtain the optimal blending proportions of burdens with minimal sintering burden cost. In this study, micro-sintering and sinter pot tests were first carried out to clarify the quantitative relationship between the shatter index (SI) of the sinter and high-temperature characteristics (HTCs) of the ore blends. The result shows that the lowest assimilation temperature (LAT) plays a dual role in SI, whereas the index of liquid phase fluidity (ILF) and compressive strength of the bonding phase (CSB) have positive effects on SI. The effect of the ILF is the largest. Based on the one-step optimization method, suitable ranges of room-temperature characteristics (RTCs) of ore blends, obtained relationship between sinter strength and HTCs of ore blends, sintering theory, and bisection and simplex algorithms, the proposed sintering burden blending model is established. The validation for the model shows that it is effective at utilizing iron ore resources, maintaining high strength of the sinter, while reducing burden costs.

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