Synthesis and Properties of Amphiphilic Block Copolymer P (BA-b-AM)
|Keywords||Butyl acrylate - acrylamide copolymer Reverse atom transfer radical polymerization Emulsion Polymerization Parents Adsorption|
Amphiphilic block copolymers due to the composition containing the hydrophilic and hydrophobic segments of the copolymer both polymer tackifying and low molecular surfactant, the water phase and the oil phase there are affinity, while the copolymer can be adsorbed In the hydrophilic and the surface of the hydrophobic substance. Plus sodium bicarbonate / sodium carbonate conditions, the use of copper bromide catalyst, pentamethyl diethylene triamine ligand, potassium persulfate as initiator, sodium dodecyl sulfate / Triton through the X-100 emulsifier, reverse atom transfer radical emulsion polymerization synthesis of butyl acrylate polymer, and then lead to acrylamide polymerization synthesis of amphiphilic block copolymers. Add to the base to the polymerization system, the amount of emulsifier, initiator dosage catalyst / ligand ratio, reaction temperature, reaction time and other conditions are discussed. The optimum synthesis of the block copolymers P (BA-b-AM): butyl acrylate polymerization temperature was 80 ° C, added sodium bicarbonate / sodium carbonate 0.01/0.01 (g / g), sodium dodecyl sulfate sodium / Triton through X-100 1-2% (by weight), [I]: [M] = 1:100 (mol), CuBr 2 : PMDETA to 1:2 (mol) , [M]: [S] = 1:1-1:2 (vol), reaction 4h, monomer conversion rate of 78%; amphiphilic block copolymers polymerization temperature of 40 ° C, the reaction time of 100min, acrylamide The conversion rate of 72%. The monomer conversion rate with the reaction time of linear growth relationship, a block copolymer of molecular weight with the monomer conversion rate also showed a linear relationship, block copolymer polymerization found kinetics linear relationship. In this paper, IR, NMR, gel permeation chromatography, viscosity, particle size of the PBA and P (BA-b-AM), the structure and performance of the characterization: the final PBA molecular weight Mn = 5.78 × 10 4 sup> Polydispersity index Mw / Mn = 1.34; P (BA-b-AM) of a molecular weight of Mn = 6.79 × 10 4 sup>, multi-dispersion index MW / Mn = 1.61, and the P (BA-b-AM ) molecular weight distribution uniform. Simultaneously, the block copolymer, the emulsion particle diameter of 282nm, a viscosity of 2.53 mPa · s. Block copolymer in the fabric surface adsorption and emulsion stability of the pigment system testing, the following conclusions: the fabric of the copolymer emulsion equilibrium adsorption time of 5min at 40 ° C, 60 ° C and 80 ℃ conditions under, found that the temperature of 60 ℃ after fabric adsorption reached equilibrium absorbance ratio of the copolymer system the greatest change in the fabric under the conditions of 60 ° C. strongest adsorption ability of the copolymer, the adsorption capacity of up to 0.90 g. The SEM spectra Characterization copolymers are adsorbed on the fibers; adding pigments, in the copolymer emulsion systems, and is not the ultrasonic treatment, the pigment can not be dispersed in the emulsion, by ultrasonic treatment, a pigment is uniformly dispersed in the emulsion, pigment particles was measured uniform particle size distribution, the better performance of system ion stability.