scholarly journals Predicting the Swelling Behavior of Acrylic Superabsorbent Polymers Used in Diapers

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Shuxin Zhang ◽  
Yangyang Peng ◽  
Ran Jiang ◽  
Wenqiang Liu ◽  
Huanlei Yang ◽  
...  
Keyword(s):  
Swelling Behavior ◽  
Product Performance ◽  
Individual Factors ◽  
Semiempirical Model ◽  
Practical Application ◽  
Acrylic Polymer ◽  
Superabsorbent Polymers ◽  
Acrylic Polymers ◽  
Nacl Concentration ◽  
Higher Temperature

Acrylic polymer is a superabsorbent for water and widely used in diapers, in which its swelling behavior can be significantly affected by several factors, i.e., the time, temperature, pH, and salt concentration, and thus the product performance in the applications. In this work, the water absorption behavior of acrylic superabsorbent polymers by each of these individual factors was investigated. The results showed that the water absorbency increases with the pH in the range of 2 to ~7 and decreases when the pH continues to increase. However, it decreases with the increases in NaCl concentration in the solution. Moreover, more water can be absorbed by the acrylic polymers at the higher temperature. Based on a previously developed kinetic swelling model and the information from the above investigations, a semiempirical model for predicting the swelling behavior of superabsorbent polymers (SAPs) under different conditions has been developed. Data showed that the model can predict (with a relative error of <4.5%) the amount of water absorbed by acrylic SAPs under different swelling conditions. The model would be very helpful to the practical application in both product design and its performance evaluation.

Adsorption of 4-Chloro-2,5-Dimethoxy Nitrobenzene by Activated Pyrolytic Char from Pine Sawdust

2014 ◽  
Vol 884-885 ◽  
pp. 190-194
Author(s):  
Wei Xiao ◽  
Ran Di Zhang ◽  
Yu Bing Song ◽  
Run Ping Han ◽  
Yan Qiang Li
Keyword(s):  
Solution Temperature ◽  
Isotherm Models ◽  
Dihydrogen Phosphate ◽  
Solution Ph ◽  
Pine Sawdust ◽  
Major Mechanism ◽  
Nacl Concentration ◽  
Initial Ph ◽  
Higher Temperature ◽  
Pyrolytic Char

The adsorption studies of 4-chloro-2,5-dimethoxy nitrobenzene (CDNB) from aqueous solution on pyrolytic char activated by ammonium dihydrogen phosphate from pine sawdust have been performed. Several experimental parameters like initial pH, NaCl concentration, contact time solution temperature were evaluated. Solution pH within 2-7 is favor of adsorption and it is advantage of adsorption at higher temperature. Langmuir, Freundlich and Temkin isotherm models were used to fit the experimental data and Temkin model was better. The adsorption capacity was up to 33.8 mg·g1at 323 K. The process is spontaneous and endothermic and physical action is major mechanism.

Effects of NR and Liquid NR Loading on Swelling Behaviour of TPU/NR Blends

2013 ◽  
Vol 795 ◽  
pp. 133-136
Author(s):  
Nor Azwin Ahad ◽  
Sahrim Haji Ahmad ◽  
Norazwani Muhammad Zain
Keyword(s):  
Natural Rubber ◽  
Thermoplastic Polyurethane ◽  
Swelling Behavior ◽  
Melt Blending ◽  
Swelling Behaviour ◽  
Blend Ratio ◽  
Equilibrium Swelling ◽  
Liquid Natural Rubber ◽  
Higher Temperature ◽  
Blend Ratios

The blends of thermoplastic polyurethane (TPU) with natural rubber (NR) at four different blend ratios were prepared via melt blending at 180°C and 190°C, with addition of liquid natural rubber (LNR) as compatibilizer. The effect of blend ratio and temperature swelling index was studied. The equilibrium swelling index of TPU and its blend increase with increasing of NR, because of the easiness for solvent to diffuse into the gap between rubber molecules. The temperatures of blending also give effect to swelling behavior. Swelling index of all samples was higher when mixed the blends at higher temperature.

scholarly journals Effect of UV Radiation on Optical Properties and Hardness of Transparent Wood

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2067
Author(s):  
Igor Wachter ◽  
Tomáš Štefko ◽  
Peter Rantuch ◽  
Jozef Martinka ◽  
Alica Pastierová
Keyword(s):  
Mechanical Properties ◽  
Renewable Resource ◽  
Degradation Process ◽  
Optical Transmittance ◽  
Acrylic Polymer ◽  
Acrylic Polymers ◽  
Modification Method ◽  
Optical And Mechanical Properties ◽  
Wood Surfaces ◽  
Uv C

Optically transparent wood is a type of composite material, combining wood as a renewable resource with the optical and mechanical properties of synthetic polymers. During this study, the effect of monochromatic UV-C (λ—250 nm) radiation on transparent wood was evaluated. Samples of basswood were treated using a lignin modification method, to preserve most of the lignin, and subsequently impregnated with refractive-index-matched types of acrylic polymers (methyl methacrylate, 2-hydroxyethyl methacrylate). Optical (transmittance, colour) and mechanical (shore D hardness) properties were measured to describe the degradation process over 35 days. The transmittance of the samples was significantly decreased during the first seven days (12% EMA, 15% MMA). The average lightness of both materials decreased by 10% (EMA) and 17% (MMA), and the colour shifted towards a red and yellow area of CIE L*a*b* space coordinates. The influence of UV-C radiation on the hardness of the samples was statistically insignificant (W+MMA 84.98 ± 2.05; W+EMA 84.89 ± 2.46), therefore the hardness mainly depends on the hardness of used acrylic polymer. The obtained results can be used to assess the effect of disinfection of transparent wood surfaces with UV-C radiation (e.g., due to inactivation of SARS-CoV-2 virus) on the change of its aesthetic and mechanical properties.

scholarly journals Metal-Organic Framework Reinforced Acrylic Polymer Marine Coatings

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 27
Author(s):  
Hwawon Seo ◽  
Inwon Lee ◽  
Vadahanambi Sridhar ◽  
Hyun Park
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Field Tests ◽  
Gas Storage ◽  
Bacterial Activity ◽  
Two Dimensional ◽  
Acrylic Polymer ◽  
Acrylic Polymers ◽  
Marine Coatings ◽  
Metal Organic

Metal-organic frameworks (MOFs), a class of crystalline, porous, 3D materials synthesized by the linking of metal nodes and organic linkers are rapidly emerging as attractive materials in gas storage, electrodes in batteries, super-capacitors, sensors, water treatment, and medicine etc. However the utility of MOFs in coatings, especially in marine coatings, has not been thoroughly investigated. In this manuscript we report the first study on silver MOF (Ag-MOF) functionalized acrylic polymers for marine coatings. A simple and rapid microwave technique was used to synthesize a two-dimensional platelet structured Ag-MOF. Field tests on the MOF reinforced marine coatings exhibited an antifouling performance, which can be attributed to the inhibition of marine organisms to settle as evidenced by the anti-bacterial activity of Ag-MOFs. Our results indicate that MOF based coatings are highly promising candidates for marine coatings.

scholarly journals Effect of Various Types of Superplasticisers on Consistency, Viscosity, Structure and Long-Term Strength of Geopolymer Products

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7614
Author(s):  
Łukasz Anaszewicz
Keyword(s):  
Fresh Concrete ◽  
Curing Temperature ◽  
Term Strength ◽  
Acrylic Polymer ◽  
Acrylic Polymers ◽  
Air Voids ◽  
Flow Table ◽  
Early Strength ◽  
Air Void

This article presents the results of research on the effect of plasticisers made based on four different compounds—melamine (M), naphthalene (NF), acrylic polymers (AP) and polycarboxylic ethers (PC)—added to the tested mixes in the amount of 2% of the fly ash (FA). The influence of superplasticisers (SPs) on the consistency of the fresh concrete was investigated using a flow table and a penetrometer, and the air voids content was determined by means of a porosimeter. Additionally, the influence of plasticisers on the viscosity of the paste was investigated using a rheometer. Hardened mortar that matured under two different conditions was also tested at elevated and room temperatures. The tested properties were 7-, 28- and 90-days compressive strength and internal microstructure viewed under a microscope. NF had the greatest viscosity-reducing effect while it increased the air void volume in the mix at the same time. The highest early and late strengths were obtained after curing in elevated temperature samples with an acrylic-polymer-based superplasticiser. However, the increased curing temperature of the samples only influenced the early strength results. Its effect was not visible after 90 days. The AP addition also had a significant impact on improving the consistency of the mixture. The addition of plasticisers did not affect the microstructure of the specimens.

scholarly journals Continuum modeling of the swelling behavior of concrete when modified through superabsorbent polymers

PAMM ◽  
2016 ◽  
Vol 16 (1) ◽  
pp. 475-476
Author(s):  
Malte Sauerwein ◽  
Ralf Jänicke ◽  
Holger Steeb
Keyword(s):  
Swelling Behavior ◽  
Continuum Modeling ◽  
Superabsorbent Polymers

scholarly journals Assessing the Effect of Curing Conditions, Specimen Type, and Superabsorbent Polymers in Compressive Strength and Abrasion of Pervious Concrete

10.29007/fvwp ◽  
2020 ◽  
Author(s):  
Dennis Daddino ◽  
Cristian Gaedicke ◽  
Fadi Castronovo ◽  
Saeid Motavalli ◽  
David Liguori
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Field Conditions ◽  
Pervious Concrete ◽  
Superabsorbent Polymers ◽  
Curing Conditions ◽  
Specimen Type ◽  
Higher Temperature ◽  
Temperature Controlled ◽  
Abrasion Damage

The effect of curing conditions, specimen type, and the use of super absorbent polymers on the Compressive Strength and Abrasion of Portland Cement Pervious Concrete was evaluated. Five different mixtures, using different water/cement ratios, and the addition of polypromancic based acid and polyacrylate based super absorbent polymers were tested. Half of the specimens were cured in a temperature-controlled room at higher temperature and lower humidity to simulate field conditions. Specimens that were cured in these harsher conditions showed reduced compressive strength in the range of 34% to 35% for cast cylinders, and 27% to 67% for cores when compared to specimens cured under ideal conditions in the lab. These samples also had 3.14 to 3.2 times the abrasion damage compared to laboratory cured samples of similar porosities.

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