Copolymerization Of Natural Extracts And SO₂ And Application Research

Sulfur dioxide?SO₂?is one of the major air pollutants in China,and it is also a standard to reflect the degree of air pollution in a country.With China turning into the world's second largest economic entity,the industrial discharge amount of SO₂ have also become the world's largest.Therefore,capture,storage and effective utilization of SO₂ will gradually become the focusofsubsequentresearch.Fromthecurrentresearchdataand achievements,the related research on the e utilization of SO₂ is relatively less.In the known study of SO₂ resource utilization,the use of olefins and SO₂ copolymerization to synthesize functional polymer materials is a more effective way of SO₂ utilization.The use of olefins extracted from petrochemicals and SO₂ is mainly used for copolymerization.The routes and resources for obtaining the olefins do not meet the requirements for sustainable development,low energy consumption and renewable resources.In this study,our attempt to prepare the sustainable functional polymer using a new green approach,we report here copolymerization of?-myrcene and Eugenol as a naturally feedstock to absorb SO₂ via the free radical polymerization.The chemical structure of the synthesized polymers was ascertainedbyspectroscopicmeasurements.Subsequently,themetal adsorption of eugenol and SO₂ copolymers was studied in detail,and the adsorptionkineticsandadsorptionthermodynamicswerestudied respectively.It was inferred that the model and method of the adsorption behavior of heavy metal in eugenolwith SO₂ copolymers were consistent.The main contents are as follows:1.A new type of poly?olefin sulfone?synthesized by copolymerization of?-myrcene with SO₂ via free radical copolymerization.From the FT-IR,¹H and ¹³C analysis,it was found that the TBHP initiated poly?MY-co-SO₂?contained 1,4-cis and 1,4-trans microstructure.Solubility behavior,thermal degradation and optical properties of poly?MY-co-SO₂?were characterized by theoretical solubility parameter,TG and Abbe-type refractometer.We also report the adhesive properties of the polymer on glass,wood,aluminum and copper.Concerning the different supports,the poly?MY-co-SO₂?contains the highest content of sulfone groups,the sulfone group can form hydrogen bonds with the hydroxyl groups on the supports.Therefore,it would be interesting to synthesize poly?MY-co-SO₂?at room temperature and check their adhesive properties.2.Copolymerization of eugenol with SO₂ was carried out by means of free radical copolymerization,and the optimum copolymerization reaction conditions were investigated.By using FT-IR,¹H-NMR,GPC,organic elements and other analytical means to determine the structure of the polymer,the content of the S element measured practically is compared with the theoretically calculated S element content,supplemented with infrared and H spectrum analysis confirmed that the copolymer of eugenol and SO₂was an alternating copolymer of 1:1.At the same time,the properties of the eugenol and SO₂ copolymers were determined,mainly focusing on thermal degradability,common dissolution solubility and heavy metal adsorption.3.In order to study the heavy metal adsorption of eugenol and SO₂copolymers,firstly,the Langmuir adsorption isotherm and Freundlich adsorption isotherm equations for adsorption thermodynamics were used for calculation and fitting,and the thermodynamic parameters for adsorption were calculated.It was concluded that eugenol and SO₂ were effective for Cr.The adsorption is not a simple monolayer adsorption,it is more in line with the Freundlich adsorption isotherm.The entire adsorption process is an endothermic process and can proceed spontaneously.Second,in order to determinethemaintypes ofadsorption,first-order kinetics model,second-order kinetics models,and intra-particle diffusion models dominate,and the data that influence the initial concentration of ions on adsorption experiments are fitted to these three models.The rate constant of the reaction adsorption equilibrium was determined to determine the rate control step of the adsorption process.