Study On Synthesis And Application Performance Of High-surface-active Hyperbranched Amphiphilic Polymers

Hyperbranched amphiphilic polymer named as poly(amino ester) and poly(imdazolium ester)s were synthesized from commercial available materials via the one pot Michael addition reaction under moderate conditions. The applications of these hyperbranched amphiphilic polymers in high-speed printing and coating indicate unique dynamic properties as efficient polymeric surfactants.Amphiphilic hyperbranched poly(amino ester)s with hydrophilic multi-ethoxylated triacrylate backbone and hydrophobic long alkyl side chain were firstly synthesized via one pot Michael addition polymerization. The poly(amino ester) could dissolve in cold water and self-assemble into loose micelle. Under 50-1000ms bubble, the dynamic surface tension (DST) of the poly(amino ester) aqueous solution (0.5wt%) still maintained in the range of 32-28 mN/m. The aqueous solutions of poly(amino ester)s with different molecular weights showed the lower critical solution temperature (LCST) in the range of 8-50℃, which could also be tuned by its pH. Capped with hydrophobic groups on the terminal units and partially neutralized with acid, the poly(amino ester)s still kept their stable dynamic surfactant behaviors, indicating promising application.The prepared amphiphilic poly(amino ester) could loosely self-assembled into single-molecular or multi-molecular micelles in nano-scale below its LCST. Because of the three-dimensional topology features in the main chain backbone, the alkyl chains were prevented from assembling into tight hydrophobic domain, and almost 'dissolved'and dispersed in polymer bulk solution, resulting in stronger dynamic surfactant activity. However, the random linear analogue had the tendency to assemble into compact hydrophobic domain and showed weaker dynamic surfactant activity. These amphiphilic poly(amino ester)s were further compared and tested in high-speed gravure printing water-based ink. The hyperbranched one could provide sufficient lower dynamic tension and promote to make ink smoothly wetting and spreading at high printing speed with less water-soluble organic solvent.Hydrocarbon soluble hyperbranched amphiphilic poly(amino ester)s were also synthesized from trimethylolpropane triacrylate and lauryl amine via the Michael addition reaction and applied in mineral oil dispersed offset printing ink. The hyperbranched polymer helped to enhance the viscoelastic modulus in the high-frequency region and improved ink transmission performance.Hyperbranched poly(imdazolium ester)s with imidazolium cations in the main-chain backbone were firstly purposely synthesized. Peripherally modified with hydrophobic groups, or its watcr soluble halide anions exchanged with hydrophobic dodecyl sulfate ions, the hyperbranched amphiphilic functional polymers were obtained from completely water-soluble one to totally hydrophobic one. The hyperbranched poly(imidazolium ester) was potentially a kind of highly active polymer surfactant.