Study on Structure Design and Properties of Super Absorbent Copolymerized with Milk Protein Grafted Acrylic Acid

2013 ◽  
Vol 842 ◽  
pp. 142-146
Author(s):  
Meng Wei ◽  
Bo Gao ◽  
Yong Cong Xiao ◽  
Yu Feng Sui
Keyword(s):  
Acrylic Acid ◽  
Milk Protein ◽  
Influence Factors ◽  
Structure Design ◽  
Cross Linking ◽  
Health Product ◽  
Absorption Performance ◽  
Pure Milk ◽  
Water Swelling ◽  
Graft Reaction

Super absorbent resin(SAR) is a kind of contains strong hydrophilic groups such as carboxyl with certain degree of water swelling type crosslinking polymer. Because it can absorb their hundreds and even thousands of times of water, which are widely used in health product 、dewatering of coal seam and many other fields [1].At present ， there is few study on water absorption performance of protein grafted acrylic acid absorbent resin. Therefore, this article selects the pure milk of JiaBao dairy company production , conducted a series of graft reaction, studied the influence factors such as the initiator, cross-linking agent, neutralization degree ,consumption of milk and PH sensitivity.

Pulses of Fast Electrons as a Tool To Synthesize Poly(acrylic acid) Nanogels. Intramolecular Cross-Linking of Linear Polymer Chains in Additive-Free Aqueous Solution

2003 ◽  
Vol 36 (7) ◽  
pp. 2484-2492 ◽  
Author(s):  
Slawomir Kadlubowski ◽  
Jaroslaw Grobelny ◽  
Wielislaw Olejniczak ◽  
Michal Cichomski ◽  
Piotr Ulanski
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Polymer Chains ◽  
Linear Polymer ◽  
Cross Linking ◽  
Fast Electrons ◽  
Poly Acrylic Acid

Polyacryloyl hydrazide based injectable & stimuli responsive hydrogels with tunable properties

2014 ◽  
Vol 2 (42) ◽  
pp. 7429-7439 ◽  
Author(s):  
Anuj Kumar ◽  
Sabindra K. Samal ◽  
Rupesh Dash ◽  
Umaprasana Ojha
Keyword(s):  
Polyethylene Glycol ◽  
Acrylic Acid ◽  
Diethyl Malonate ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Stimuli Responsive ◽  
Polyethylene Glycol Diacrylate ◽  
Glycol Diacrylate ◽  
Responsive Hydrogels

The synthesis and characterization of a series of injectable and stimuli responsive hydrogels based on polyacryloyl hydrazide have been accomplished using dimethyl 2,2′-thiodiacetate, acrylic acid, diethyl malonate and polyethylene glycol diacrylate as cross-linkers through a chemical or dual cross-linking pathway.

Swelling of PVA/Chitosan/TiO2 Nanofibers Membrane in Different PH

2020 ◽  
Vol 990 ◽  
pp. 220-224
Author(s):  
Ari Dwi Nugraheni ◽  
Diki Purnawati ◽  
Ani Rohmatillah ◽  
Dian Nur Mahardika ◽  
Ahmad Kusumaatmaja
Keyword(s):  
Time Constant ◽  
Weight Ratio ◽  
Low Ph ◽  
Membrane Stability ◽  
Swelling Behavior ◽  
Cross Linking ◽  
High Ph ◽  
Chitosan Concentration ◽  
Nanofiber Membranes ◽  
Water Swelling

The nanofiber PVA/chitosan have been successfully fabricated by the addition of TiO2 or without TiO2. Nanofiber membranes of PVA/chitosan/TiO2 were fabricated with weight ratio of PVA/chitosan (w/w) 90/10, 85/15, and 80/20. Glutaraldehyde cross-linking was added to increase membrane stability in water. Swelling behavior was tested in three different pH to investigate the swelling behavior of nanofiber membranes of PVA/chitosan with and without TiO2. The result indicated that the addition of chitosan concentration would decrease the swelling index, and increase the time constant (τ). The swelling index will increase in high pH (pH 10.01) compare to low pH (pH 4.01).

Modification of Rabbit Yarn by Milk Protein Grafting and Cross-Linking

2015 ◽  
Vol 10 (4) ◽  
pp. 155892501501000
Author(s):  
Li Jiali ◽  
Zhang Tonghua ◽  
Cheng Lan ◽  
Guo Min
Keyword(s):  
Milk Protein ◽  
Breaking Strength ◽  
Fiber Surface ◽  
Cross Linking ◽  
Knitted Fabric ◽  
Grafting Ratio ◽  
Locus Method ◽  
Graft Modification ◽  
Before And After ◽  
Friction Performance

Rabbit yarn was treated by milk protein grafting and cross-linking to improve its abrasion resistance performance and breaking strength. Grafting ratio and washing fastness of the rabbit yarn after graft modification were tested. The surface morphology of the rabbit yarn before and after graft modification was observed by a scanning electron microscope(SEM). The mechanical properties and friction performances of the treated and untreated rabbit yarns were also tested. The treated yarns were utilized to design and weave rabbit hair-knitted fabric. The anti-pilling resistance of the rabbit hair-knitted fabric was tested by circular locus method; the pills were then counted and weighed. The stiffness of the fabric was observed. Results showed that milk protein could obviously be grafted on the fiber surface, resulting in a rougher surface of the treated fabric than that of the untreated ones. The average grafting ratio is 3.701%. The protein retention ratio of the rabbit yarn treated by milk protein grafting and cross-linking is 99.312%. The breaking strength of the rabbit yarn was enhanced and friction performance improved significantly after treatment. The pilling grade of the fabric significantly improved and the stiffness of the fabric was reduced.

scholarly journals pH-sensitive polyvinylpyrrolidone-acrylic acid hydrogels: Impact of material parameters on swelling and drug release

2014 ◽  
Vol 50 (1) ◽  
pp. 173-184 ◽  
Author(s):  
Kashif Sohail ◽  
Ikram Ullah Khan ◽  
Yasser Shahzad ◽  
Talib Hussain ◽  
Nazar Muhammad Ranjha
Keyword(s):  
Drug Release ◽  
Acrylic Acid ◽  
Phosphate Buffer ◽  
Ph Sensitive ◽  
Cross Linking ◽  
Release Mechanism ◽  
Effect Analysis ◽  
X Ray Crystallography ◽  
Buffer Solutions ◽  
The One

In this study, we fabricated pH-sensitive polyvinylpyrrolidone/acrylic acid (PVP/AA) hydrogels by a free-radical polymerisation method with variation in the content of monomer, polymer and cross-linking agent. Swelling was performed in USP phosphate buffer solutions of pH 1.2, 5.5, 6.5 and 7.5 with constant ionic strength. Network structure was evaluated by different parameters and FTIR confirmed the formation of cross-linked hydrogels. X-ray crystallography showed molecular dispersion of tramadol HCl. A drug release study was carried out in phosphate buffer solutions of pH 1.2, 5.5 and 7.5 for selected samples. It was observed that swelling and drug release from hydrogels can be modified by changing composition and degree of cross-linking of the hydrogels under investigation. Swelling coefficient was high at higher pH values except for the one containing high PVP content. Drug release increased by increasing the pH of the medium and AA contents in hydrogels while increasing the concentration of cross-linking agent had the opposite effect. Analysis of the drug release mechanism revealed non-Fickian transport of tramadol from the hydrogels.

Running Cars Induced Wind Loads on Sound Barrier of Elevated Roads

2011 ◽  
Vol 378-379 ◽  
pp. 137-142 ◽  
Author(s):  
Da Lei Wang ◽  
Liang Zheng ◽  
Ai Rong Chen
Keyword(s):  
Traffic Noise ◽  
Influence Factors ◽  
Noise Pollution ◽  
Structure Design ◽  
Parameter Analysis ◽  
Wind Loads ◽  
Steel Columns ◽  
Sound Barrier ◽  
Short Service Life ◽  
Distribution Rule

Sound barriers are widely used as an important engineering measure to mitigate traffic noise pollution in urban elevated roads. However, structure design codes on sound barrier used in urban viaduct is empty, which is a key reason for the short service life of sound barrier. Numerical simulation of characteristics of running cars induced wind loads on sound barrier of elevated roads is carried out based on the method of computational fluid dynamics. The changing course of wind loads on the surface of sound barrier is reappeared in the process of cars passing by the sound barrier. The distribution rule of wind loads on the surface of sound barrier at different space positions is revealed. Influence factors of wind loads on surface of sound barrier are discussed by parameter analysis. The conclusions shows that running cars induced wind loads on sound barrier of elevated roads should considered as one main design loads, especially for the anti-fatigue design of steel columns of plate-inserted sound barrier.

scholarly journals Tunable Narrowband Silicon-Based Thermal Emitter with Excellent High-Temperature Stability Fabricated by Lithography-Free Methods

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1814
Author(s):  
Guozhi Hou ◽  
Qingyuan Wang ◽  
Yu Zhu ◽  
Zhangbo Lu ◽  
Jun Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Absorption Spectra ◽  
Fdtd Method ◽  
Temperature Stability ◽  
High Energy ◽  
Structure Design ◽  
Bragg Reflector ◽  
High Temperature Stability ◽  
Absorption Performance ◽  
Thermal Emitter

Thermal emitters with properties of wavelength-selective and narrowband have been highly sought after for a variety of potential applications due to their high energy efficiency in the mid-infrared spectral range. In this study, we theoretically and experimentally demonstrate the tunable narrowband thermal emitter based on fully planar Si-W-SiN/SiNO multilayer, which is realized by the excitation of Tamm plasmon polaritons between a W layer and a SiN/SiNO-distributed Bragg reflector. In conjunction with electromagnetic simulations by the FDTD method, the optimum structure design of the emitter is implemented by 2.5 periods of DBR structure, and the corresponding emitter exhibits the nearly perfect narrowband absorption performance at the resonance wavelength and suppressed absorption performance in long wave range. Additionally, the narrowband absorption peak is insensitive to polarization mode and has a considerable angular tolerance of incident light. Furthermore, the actual high-quality Si-W-SiN/SiNO emitters are fabricated through lithography-free methods including magnetron sputtering and PECVD technology. The experimental absorption spectra of optimized emitters are found to be in good agreement with the simulated absorption spectra, showing the tunable narrowband absorption with all peak values of over 95%. Remarkably, the fabricated Si-W-SiN/SiNO emitter presents excellent high-temperature stability for several heating/cooling cycles confirmed up to 1200 K in Ar ambient. This easy-to-fabricate and tunable narrowband refractory emitter paves the way for practical designs in various photonic and thermal applications, such as thermophotovoltaic and IR radiative heaters.

scholarly journals Synthesis and characterization of thermoresponsive hydrogels cross-linked with chitosan

2008 ◽  
Vol 6 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Yueqin Yu ◽  
Xianzhi Chang ◽  
Hansheng Ning ◽  
Shusheng Zhang
Keyword(s):  
Acrylic Acid ◽  
Pure Water ◽  
Solution Temperature ◽  
Feed Ratio ◽  
Cross Linking ◽  
Environmentally Responsive ◽  
Extracellular Materials ◽  
Degradation Properties ◽  
Phosphate Buffered Saline

AbstractHydrogels composed of N-isopropylacrylamide (NIPAAm) and acrylic acid (AAc) were prepared by redox polymerization with degradable chitosan cross-linkers. Chitosan degradable cross-linkers were synthesized by the acrylation of the amine groups of glucosamine units within chitosan and characterized with 1H NMR. With the chitosan cross-linkers, loosely cross-linked poly(N-isopropylacryamideco-acrylic acid) [P(NIPAAm-co-AAc)] hydrogels were prepared, and their phase transition behavior, lower critical solution temperature (LCST), water content and degradation properties were investigated. The chitosan cross-linked P(NIPAAm-co-AAc) hydrogels were pliable and transparent at room temperature. The LCST could be adjusted at 32∼39°C by alternating the feed ratio. Swelling was influenced by NIPAAm/AAc monomer ratio, cross-linking density, swelling media, and temperature. All hydrogels with different feeding ratios contained more than 95% water at 25°C in the ultra pure water and phosphate-buffered saline (PBS, pH = 7.4 ± 0.1), and had a prospective swelling in the simulated gastric fluids (SGF, pH = 1.2) > 72.54%. In degradation studies, breakdown of the chitosan cross-linked P(NIPAAm-co-AAc) hydrogels was dependent on the cross-linking density. The chitosan cross-linked P(NIPAAm-co-AAc) hydrogels which can be tailored to create environmentally-responsive artificial extracellular materials have great potential for future use.

Synthesis and Properties of Thermo- and pH-Sensitive Poly[(Sodium Humate)-(N-Isopropylacrylamide)-(Acrylic Acid)] Intelligent Hydrogel

2013 ◽  
Vol 781-784 ◽  
pp. 536-541
Author(s):  
Xiao Mi Zhou ◽  
Xiao Ran Sun ◽  
Guang Yue Li
Keyword(s):  
Acrylic Acid ◽  
Suspension Polymerization ◽  
Ammonium Persulfate ◽  
Continuous Phase ◽  
Ph Sensitive ◽  
Cross Linking ◽  
Swelling Ratio ◽  
Inverse Suspension Polymerization ◽  
Sensitive Characteristics ◽  
Intelligent Hydrogel

A novel intelligent hydrogel of poly(Humic acid - Nisopropylacrylamide - Acrylic acid) (P(NIPAAm-HA-AA)) was prepared at 70°C by inverse suspension polymerization. The reactions include uses N,N-methylene-bis-acrylamide (MBA) as a cross-linking agent, ammonium persulfate (KPS) as an initiator, cyclohexane as a continuous phase and span-65 as dispersant. The influence such as concentration of monomers and cross-linking agent, mole fraction of span-65 in mixed monomers, and temperature of polymerization on the property of resulting P(NIPAAm-HA-AA) hydrogels was investigated in detail. Fourier transform infrared (FTIR) demonstrated that NIPAAm, HA and AA was synthetized successfully. The results showed that the swelling ratio (SR) of modified hydrogel was improved significantly with the dosage of NIPAAm. It was also observed that the thermosensitive and pH sensitive characteristics was strongly affected by concentrations of NIPAAm. At last, we choose NIPAAm: HA=0.3.

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