Preparation And Properties Of Styrene - Butyl Acrylate Copolymer Fiber

In this dissertation, the corresponding polymer was synthesized by using styrene, butyl acrylate, butyl methacrylate and hydroxyethyl methylacrylate as raw monomers. After modification by solution polymerization and reactive extrusion, the polymer was spun into different fibrous materials through wet spinning, melt spinning, and electrospinning.First, styrene and butyl acrylate was used as monomers, and their copolymer was synthesized via suspension polymerization. The copolymer was formed from the random linkage of rigid and flexible chain segments, its rigid chain segments were formed by styrene, and its flexible chain segments were formed by butyl acrylate, thus it showed good low-temperature resistance compared with polystyrene. The results of electrospinnability research showed that flexible butyl acrylate chain segments had a more important impact on the electrospinnability of the copolymer solution compared with the entanglement concentration Ce. Besides, the electrospun fibrous membrane exhibited good hydrophobicity and lipophilicity due to the nonpolarity of styrene chain segments and the porous structure formed by the random arrangement of nano-micro fibers. The water contact angle approached 155.0° as the fibrous membrane was immersed into sunflower oil; the maximum oil removal efficiency reached 97.3% when the fibrous membrane was used as oil absorbent, and oil removal efficiency was still up to 74.2% as the fibrous membrane was used for seven times. Additionally, when O/W emulsion passed through the fibrous membrane, the oil could be absorbed by the fibrous membrane and the mulsion became clear.Second, solution polymerization was adopted to modify the copolymer of styrene and butyl acrylate and to prepare spinning solution when the N, N-dimethylformamide solution of the above-synthesized copolymer, hydroxyethyl methylacrylate, and benzoyl peroxide were used as polymerization medium, monomer, and initiator, respectively. The spinning solution was spun into fiber via wet spinning. During the post-treatment of the fiber, because poly (hydroxyethyl methylacrylate) (PHEMA) which was generated during solution polymerization contained a lot of hydroxyl groups, and the hydroxyl groups could perform an oxidation-reduction reaction with potassium permanganate in the presence of the aqueous solution of sodium hydroxide, thus carboxylic acid groups and manganese oxides were in-situ generated on the prepared fiber’surface,and manganese oxides were firmly immobilized by the fiber’surface due to the complexation between carboxylic acid groups and manganese oxides. Manganese oxides-loaded fiber could catalyze hydrogen peroxide and ozone to oxidize cationic blue, making the maximum removal efficiency of cationic blue in its aqueous solution reach up to 95.8%.Thereafter, to remedy the poor strength of wet spinning fiber, a solution was prepared by dissolving benzoyl peroxide in hydroxyethyl methacrylate, and the solution was then sprayed into the copolymer of styrene and butyl acrylate. Then, we adopted reactive extrusion to make hydroxyethyl methylacrylate polymerize into PHEMA which owned a lot of hydroxyl groups and to modify the copolymer of styrene and butyl acrylate. Finally, the modified polymer was spun into fiber by combining with melt spinning. Based on the above-mentioned mechanism, the fiber was treated, and manganese oxides were loaded on the surface of the prepared fiber, as a result, the formed fiber was endowed with the catalytic oxidation capability for cationic blue dye.At last, to manufacture the fibrous material with higher specific surface area, fibrous membrane was prepared via the electrospinning of the above extrudate. Based on the above-mentioned mechanism, the fibrous membrane was treated, and manganese oxides were loaded on the surface of the prepared fibrous membrane. The mechanism of catalytic oxidation was researched in detail. The fibrous membrane was found to have good reusability.