Guangzhong Xing

Preparation and characterization of WPU/CNT/GO nanocomposites

abstract WPU/CNT/GO nanocomposites were prepared with waterborne polyurethane (WPU), grapheme (GO) and carbon nanotubes (CNT) as main materials modified by (3-Aminopropyl) triethoxysilane (APTES). The morphologies and composite physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG) and fourier transform infrared spectroscopy (FTIR). Scanning electron microscopy observations revealed that modified GO had good compatibility with WPU whereas modified CNT had slight agglomeration. Results from FTIR and TG suggested that modified CNT and GO had been successfully introduced to the polyurethane molecular chain, when the ratio of CNT and GO was 1:2, thermal decomposition temperature of the composite films was increased by 30°C than pure WPU film, at the same time water resistance and mechanical properties of the composite films were obviously improved.

Use of Novel Polyurethane Microspheres in a Curcumin Delivery System

Despite having a wide range of beneficial pharmacological effects, curcumin is characterized by poor water solubility and absorption. In this study, novel polyurethane microspheres containing curcumin (Cur-PUMs) were prepared using carboxymethyl cellulose sodium to improve the bioavailability and prolong the retention time of curcumin. The prepared Cur-PUMs were characterized by Fourier transform infrared spectroscopy, scanning electron microscope, and ultraviolet spectrophotometer. The sustained-release effects of Cur-PUMs were demonstrated using stability tests in vitro and in vivo pharmacokinetic studies following oral administration. We found that the stability of Cur-PUMs was strongly affected by pH variation. Further, compared with free curcumin, Cur-PUMs showed significantly improved maximum concentration and half-life.

Research on the microstructure and property of an anion rubber modified asphalt

The anion rubber modified asphalt (ARMA) mixture was first successfully developed with a unique process. In the development process, rubber and asphalt were mixed in the same proportion. Furthermore, the microstructure and modification mechanism of the material were characterized by SEM, FT-IR, TG, and XRD tests. The mechanical property of the mixture was also tested in accordance with the relevant standards. In the end, the materials capacity of releasing anion was measured by DLY-6A232 atmospheric ion gauge. Theresults indicated that the addition of anion additive into the rubbermodified asphalt (RMA) was amere physical mixture, and the anion additives and rubber particles uniformly dispersed in the ARMA. The addition of anion additive could improve the thermal stability of the RMA. Compared with the traditional asphalt pavement material, the ARMA material shows excellent mechanical properties as well as the ability of releasing anion. Moreover, the material has enormous economic and social benefits by taking full advantage of a large amount of waste tires, thus improving the road surrounding environment.

Preparation and properties of anion rubber-modified asphalt

First successfully developed anion rubber modified asphalt mixture with a unique process based on mixing rubber and asphalt in the same proportion. The results showed that compared with conventional asphalt, the anion rubber modified asphalt show a more excellent general performance and anion release function, fully meet the relevant specifications and improve road surrounding environment, also bring huge economic and social efficiency.

Characterization of the Key Material for Elimination of PM2.5 Particles in the Atmosphere

In recent years, with the gradual deterioration of air quality and with the more and more frequency of haze weather phenomenon, it intrudes into the human body and brings great harm to human health when people are unprepared. The basic theory that anion could purify air and eliminate positive ion explains that anion balata modified bitumen could reduce PM2.5, and the number of anion pavement release relates to the air purification. At the same time, building materials plaza and pavement materials with many functions were designed which can release negative ions, eliminate PM2.5 particles, and decompose harmful components of fuel vehicle exhaust.

Characterization of Binary Organogels Based on Some Azobenzene Compounds and Alkyloxybenzoic Acids with Different Chain Lengths

In this work the gelation behaviors of binary organogels composed of azobenzene amino derivatives and alkyloxybenzoic acids with different lengths of alkyl chains in various organic solvents were investigated and characterized. The corresponding gelation behaviors in 20 solvents were characterized and shown as new binary organic systems. It showed that the lengths of substituent alkyl chains in compounds have played an important role in the gelation formation of gelator mixtures in present tested organic solvents. Longer methylene chains in molecular skeletons in these gelators seem more suitable for the gelation of present solvents. Morphological characterization showed that these gelator molecules have the tendency to self-assemble into various aggregates from lamella, wrinkle, and belt to dot with change of solvents and gelator mixtures. Spectral characterization demonstrated different H-bond formation and hydrophobic force existing in gels, depending on different substituent chains in molecular skeletons. Meanwhile, these organogels can self-assemble to form monomolecular or multilayer nanostructures owing to the different lengths of due to alkyl substituent chains. Possible assembly modes for present xerogels were proposed. The present investigation is perspective to provide new clues for the design of new nanomaterials and functional textile materials with special microstructures.

Preparation and Characterization of Fiber-Tourmaline/PVA Nanofiber Prepared by Electrospinning

In this paper, fiber-tourmaline was for the first time used in preparation of fiber tourmaline nano powder. The preparation process of fiber tourmaline/PVA spinning solution based on the vinyl acetate, fiber tourmaline nano powder and EDTA was described through the use of micro-polymer chemistry laboratory equipment. The utilization of micro-polymer processing equipment-electrostatic spinning machine for the first time successfully prepared the fiber tourmaline/PVA composite nanofibers. The samples were characterized and the performance of its anion was tested, after which the impact of the addition of fiber tourmaline upon the electrospun fiber was analyzed and the best quality scores of tourmaline that need were also discussed.

Preparation and Research of Electrospinning Chitosan Nanofiber Sustained-Release Carrier

In this paper, chitosan (CTS) nanofibers loaded Ca2+, Zn2+, Mg2+, Ce3+, ibuprofen and amoxicillin sustained-release carriers were prepared by electrospinning. The morphology, performance and structure were characterized by SEM, FTIR, TG and DTG, etc. Rheological analysis indicated that the viscosity of mixture solution was proportional to concentration of polymers, while surface tension had no relationship with it. SEM images revealed that the diameter of nanofibers varied from 25 nm to 70 nm, and the nanofibers which loaded 0.8% concentration of Ca2+ presented optimal spinning effect with a CTS/PVA ratio at 7:3. FTIR showed that loaded materials were successfully contained in electrospun nanofibers and had strong interaction with them.

Preparation and characterization of PVA/P(AA-AM) super absorbent polymer

ABSTRACT PVA/P(AA-AM) super absorbent polymer was prepared with polyvinyl alcohol (PVA), acrylic acid (AA) and acrylamide (AM) as main materials by solution polymerization. The morphologies and composite physical states were investigated using fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetry analysis (TG-DTG). Scanning electron microscopy observations revealed that a large number of porous network structures existed in the resin. Results from FTIR and XRD suggested that PVA/P(AA-AM) superabsorbent which had semi-interpenetrating network structure had been successfully prepared. Results from TG-DTG suggested that PVA/P(AA-AM) superabsorbent had good thermal stability under 200°C. At the same time it had good water retention property and the water retention property of sandy soil was improved obviously when the resin was added into the sandy soil.

Preparation and research of waterborne polyurethane phase change material 2

ABSTRACT In this paper, the researcher first designed molecular structure of water-soluble polyurethane phase change material. Then, by taking HDI, PEG, chain extender (DMPA, BDO, EDA), catalyst (DBTDL) and neutralizing agent (TEA) as the main raw material, the author prepared waterborne polyurethane phase change material (WPUPC), which is available for wet spinning. The orthogonal design determined the optimal ratio of raw materials, namely, DMPA content is 7 wt%, R equals 6, emulsifying temperature is 30°C, the reaction temperature is 60°C and the reaction time is 180 min. Whats more, WPUPCM was characterized utilizing FTIR, DSC-TG and TG-FTIR. A series of tests indicated that this experiment successfully prepared WPUPCM, which has the following advantages: reversible phase change process, high thermal stability, excellent thermal cycling stability, safety and environmental protection. It is foreseeable that this material has broad application prospects in the field of functional textiles.