On-Demand Transformation of Carbon Dioxide into Polymers Enabled by Comb Shaped Metallic Oligomer Catalyst

Quantitative transformation of CO2 can greatly elevate the sustainability impact of CO2 chemical utilization, but it is formidably challenging due to the sluggish kinetics requiring overwhelmingly excess usage of CO2. Here, we report an on demand CO2 transformation by a switch polymerization method, that is, all reactants including CO2 are fully converted without any by-product, generating tailor-made poly(ether carbonate) polyols (CO2-polyols) whose composition and chain length exactly correspond to the feed of CO2, epoxide and diacid. This is the first time for CO2 as a countable monomer which is in most cases obscurely considered as “pressure condition”. Studies on the kinetics rate law and the activation parameters of key intermediates disclose that it is the multisite cooperativity from metallic oligomer catalyst that facilitates quantitative insertion of CO2 into polymer backbone without adverse backbiting throughout the polymerization. Hence, this work not only introduces the conception of quantitative CO2 transformation, but engineers exquisite CO2-based polymer which is rarely achieved.<br>

On-Demand Transformation of Carbon Dioxide into Polymers Enabled by Comb Shaped Metallic Oligomer Catalyst

Quantitative transformation of CO2 can greatly elevate the sustainability impact of CO2 chemical utilization, but it is formidably challenging due to the sluggish kinetics requiring overwhelmingly excess usage of CO2. Here, we report an on demand CO2 transformation by a switch polymerization method, that is, all reactants including CO2 are fully converted without any by-product, generating tailor-made poly(ether carbonate) polyols (CO2-polyols) whose composition and chain length exactly correspond to the feed of CO2, epoxide and diacid. This is the first time for CO2 as a countable monomer which is in most cases obscurely considered as “pressure condition”. Studies on the kinetics rate law and the activation parameters of key intermediates disclose that it is the multisite cooperativity from metallic oligomer catalyst that facilitates quantitative insertion of CO2 into polymer backbone without adverse backbiting throughout the polymerization. Hence, this work not only introduces the conception of quantitative CO2 transformation, but engineers exquisite CO2-based polymer which is rarely achieved.<br>

Sulfate-Functionalized Metal−Organic Frameworks Supporting Pd Nanoparticles for the Hydrogenolysis of Glycerol to 1,2-propanediol

Selective hydrogenolysis of glycerol to 1,2-propanediol is one of the options for the chemical utilization of glycerol. In this work, we synthesized sulfate-functionalized metal-organic frameworks loading palladium nanoparticles, MOF-808-SO4-Pd, as...

Cracking of squalene into isoprene as chemical utilization of algae oil

Thermal decomposition of squalene proceeds as a chain reaction to produce isoprene (C5H8) and C10 hydrocarbons.

Hybrid Advanced Oxidation Processes Involving Ultrasound: An Overview

: Sonochemical oxidation of organic pollutants in an aqueous environment is considered to be a green process. This mode of degradation of organic pollutants in an aqueous environment is considered to render reputable outcomes in terms of minimal chemical utilization and no need of extreme physical conditions. Indiscriminate discharge of toxic organic pollutants in an aqueous environment by anthropogenic activities has posed major health implications for both human and aquatic lives. Hence, numerous research endeavours are in progress to improve the efficiency of degradation and mineralization of organic contaminants. Being an extensively used advanced oxidation process, ultrasonic irradiation can be utilized for complete mineralization of persistent organic pollutants by coupling/integrating it with homogeneous and heterogeneous photocatalytic processes. In this regard, scientists have reported on sonophotocatalysis as an effective strategy towards the degradation of many toxic environmental pollutants. The combined effect of sonolysis and photocatalysis has been proved to enhance the production of high reactive-free radicals in aqueous medium which aid in the complete mineralization of organic pollutants. In this manuscript, we provide an overview on the ultrasound-based hybrid technologies for the degradation of organic pollutants in an aqueous environment.

Assessment of the Possibility of Polymer Composite Materials Recycling by Chemical Method

The research of chemical utilization, which is mainly aimed at chemical depolymerization or removal of matrix by carbon fiber preservation, is presented. The article reflects the research results of carbon fiber composites disposal through chemical method providing the reinforcing filler extraction of the total matrix volume, which further can be reused in the polymer composite materials production, thereby the costly resource is saved. The obtained results allow to assess the possibility of establishing a fundamental basis for the waste and polymer composite materials articles disposal technology.