The experimental results show that the effect obtained with zinc double dip process is better than that obtained with zinc single dip process. Through orthogonal experiments optimum zinc dipping technology was established: NaOH 210 g/L, ZnO 20 g/L, NaKC4H4O6·4H2O 40 g/L,dipping time 45 s, solution temperature 20℃.
Preliminary investigations on technological conditions of ultrasonic extraction showed that the optimal technological parameters were 20kHz for ultrasonic frequency,20min for treatment time,80% ethanol concentration,ratio of material to liquid of 1∶4, 800W power,50℃ for solution temperature,and the highest of tea saponin reached 96.1%.
Therefore, the florescence intensity at 307 nm was increased by 314% and the antibacterial activity was presented in Mn2+-PNIPAM complex, while the lower critical solution temperature of PNIPAM was not changed.
Moreover, the lower critical solution temperature (LCST) of the graft copolymer in aqueous solution was dependent on its grafting extent and concentration.
Copolymers of N,N-diethylacrylamide and N-acryloylphthalimide with a lower critical solution temperature (LCST) were synthesized by radical copolymerization.
Dynamic membranes were prepared from poly(N-isopropylacrylamide-co-heptadecyl vinyl ketone) having a lower critical solution temperature in an aqueous solution and being a micelle-forming surfactant.
The dependence of the critical concentration of the copolymer micellization on temperature was shown to have an extreme character, with a minimum at the lower critical solution temperature of the copolymer.
Other techniques for solving the above problem, namely, an increase in the temperature of the test solution temperature or the use of solvent extraction, bioaccumulation, and unusual analytical procedures are also considered.