Papers by Keyword: Absorbency

Abstract: Super absorbent resin acrylic acid-acrylamide (P (AA-AM)) was synthesized by water solution copolymerization method using acrylic acid (AA) and acrylamide (AM) as monomer, potassium persulfate as initiator, aluminum hydroxide as crosslinking agent. The effects of mole ratio of acrylamide (AM) to acrylic acid (AA), degree of neutralization of AA, the amount of crosslinking agent and initiator, and reaction temperature on absorbing water performance influence was inspected.

Abstract: A new type of poly (acrylic acid-co-acrylamide) was synthesized by copolymerization method using acrylic acid (AA) and acrylamide (AM) as monomer. Synthesis technology was as follow: the acrylamide and acrylic acid molar ratio was 0.3-0.4, the temperature was 55-60°C, the degree of neutralization of AA was 70%, the potassium persulfate and monomer mass ratio was 0.2%-0.3%, the aluminum hydroxide and monomer mass radio was 0.03%-0.05%. The water absorption was more than thousands of times.

Abstract: A kaolin/sodium lignosulfonate graft acrylic acid and acrylamide superabsorbent composites(KLPAAM) prepared by solution polymerization are used for the equilibrium absorbency test of KLPAAM superabsorbent composite in different metal ion salt solutions. The effects of the solution concentrations on the equilibrium absorbencies in CuCl₂, ZnCl₂, FeCl₃ and AlCl₃ solutions are in order: CuCl₂<ZnCl₂<FeCl₃<AlCl₃. The solution concentrations and the pH values have an important effect on the equilibrium absorbencies. There are different pH values, 3.0 in FeCl₃ and ZnCl₂, 4.25 in AlCl₃ and 6.0 in CuCl₂ solution when the equilibrium absorbencies quickly increase with the pH values of the solutions. And then they reach their relative define values, in which the pH value is 3.8 in FeCl₃, 3.5 in ZnCl₂ and 5.5 in AlCl₃ solution. The absorbency obviously increases again when the pH value is larger than 7.0 in ZnCl₂ solution. They are slightly affected by the solution temperatures, that is, slightly decreases with increasing solution temperatures.

Abstract: Poly(acrylate-co-acrylamide)(PAAM) superabsorbent was prepared from partly- neutralized acrylic acid(AA) and acrylamide(AM) by inverse suspension polymerization. Its chemical structure and thermal property were characterized by Fourier-transform infrared spectrophotometer(FTIR) and the thermogravimetric analysis(TGA). The effects of various salt solutions on the absorbencies were studied systemically. Under the same ion strengths, the absorbencies of PAAM were in the order LiCl>NaCl>KCl in MCl (M=Li, Na, K) solutions and NaBr>NaCl>NaF in NaX solution, respectiverly. The tendency of absorbency of PAAM for the alkaline earth metal salt solutions was in the order MgCl₂>CaCl₂>BaCl₂. PAAM resin is thermal stable before 320°C.

Abstract: Paper surface efficiency (PSE), a paper property integrating gloss and absorbency, can be used to evaluate color reproduction after the interaction of paper and ink. But it was shown that the color reproduction was still related to paper whiteness in practice. So it is important to amend the PSE formula. In this paper, an assumed PSE formula which integrates gloss, whiteness and ink absorbency is firstly presented, and according to experimental data, it can be well forecasted that the change of these principal paper properties would affect color reproduction result via the new PSE formula. The data connection between the assumed and new PSE formula and ink color reproduction based the description of photo-density measurement and chromatic one was studied subsequently. The results showed that photo-density measurement was simpler and more practical than chromatic measurement.

Abstract: Kaolin/sodium lignosulfonate graft acrylic acid and acrylamide superabsorbents composites(LPAAM) were prepared by solution polymerization using sodium lignosulfonate, acrylic acid and acrylamide as raw materials, kaolin as inorganic filler, potassium peroxydisulfate as initiator, N,N’-methylene-bis-acrylamide as crosslinker and by saponifying 2h under 90 , 0.10mol/L NaOH solution. Its equilibrium absorbencies in distilled water and 0.9%NaCl solution are 1003g/g and 89g/g, respectively. The structure, morphology and thermal property are testing by FTIR, SEM and TG, respectively.

Abstract: Stabilized zirconia shows rather high microwave absorbency at room temperature, and the absorbency become higher with increasing temperature. In this study, stabilized zirconia powder, partially stabilized zirconia powder and zirconia fiber were subjected for microwave absorption measurements at elevated temperature. Microwave absorption measurements were done by using a system consists of a microwave vector network analyzer, a circular wave-guide fixture and a vacuum furnace. Microwave absorbency was evaluated by the reflection power change from the sample in the circular wave-guide fixture under vacuum heating. Microwave absorbency of stabilized zirconia powder, partially stabilized zirconia powder and zirconia fiber gradually increased with the increase of temperature. We supposed that the increase of microwave absorbency is related to the ionic (oxygen) conduction behavior of stabilized zirconia. Stoichiometric composition ZrO2 powder was also subjected for a measurement to consider the relation between microwave absorbency and ion conduction of zirconia. As the result, stoichiometric composition ZrO2 powder was not absorbed microwave power even when the powder was heated up to 900oC because it isn’t an oxygen ion conductor.