Advanced Materials Research Vols. 690-693

Abstract: The surface-features of PP/nano-TiO₂ masterbatch before and after microwave irradiation were investigated by FT-IR, and then PP/nano-TiO₂ composites were prepared through secondary melt extrusion. The mechanical properties and crystallization behaviors of PP/nano-TiO2 composites before and after microwave irradiation were studied by mechanical property tests, Scanning Electron Microscope (SEM), differential scanning calorimetry (DSC) and polar optical microscope (POM). The results showed that impact strength, tensile strength and flexural modulus of PP/nano-TiO2 composites were remained, but elongation at break increased by 100% after microwave irradiation because their tensile fracture modes changed, and their crystallization onset temperature and crystallization temperature decreased respectively by 2.26°C and 2.23°C but crystallinity increased by 20%, while crystallization rate remained and the size of PP spherulites became bigger obviously.

Abstract: In this study the different finesses degree of the pulverized Eupatorium Adenophorum (EA) was evaluated as potential raw materials for the low-cost hydrogels whose the swelling behaviors were compared and studied at the same graft-copolymerization condition. The results are shown that the absorbency of EA hydrogels increased with decreasing the granule size of pulverized EA from 0.450mm to 0.063mm, while the swelling ratios gradually decreased with continuously reducing the particles size to 0.020mm, and the swelling exponents have been found to indicate non-Fickian mechanism for EA hydrogels at the all finesses range of 0.020~0.450mm. Moreover, to obtain better model for above 60% water uptake, the Beren-Hopfenberg differential model was applied, which also enabled to calculate the relaxation constants.

Abstract: The core-shell polyurethane-acrylate(PUA) emulsion containing fluorine and silicon in the core was synthesized by “one-pot” emulsion polymerization in the presence of castor oil-based polyurethane without traditional emulsifier, using methyl methacrylate (MMA), butyl acrylate (BA) as the main monomers, dodecafluoroheptyl methacrylate (G04), γ-methacryloxy propyl trimethoxyl silane (KH-570) as the functional monomers. The structure and properties of the fluorinated-silicated PUA and their films were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR) and contact angle testing. The results showed that fluorine and silicon monomers had effectively copolymerized with acrylic monomers and a core-shell structure in the latex was formed. The water contact angle for film-air interface is 92.5^o, and the cetane contact angle for film-air interface is 47.5 ^o.

Abstract: It has been proved that chitin content in Antarctic krill is much higher than other marine shelled organisms; therefore, people pay much more attention to the extraction and application of the chitin in Antarctic krill. During the experiments which use the traditional acid and alkali method to extract the chitin from Antarctic krill, the chitin’s extraction efficiency was found out to have a great influence on the degree of grinding the shell. After testing and then come to a conclusion that based on the chitin content: extraction efficiency, concentration and dosage of the acid and alkali as well as many other factors, the material’s fineness should be within forty mesh. And the optimum process conditions are: alkali treatment: concentration 25%, solid-liquid ratio 1:10, temperature 95°C, 2 hours; acid treatment: concentration 10%, solid-liquid ratio 1:10, temperature 60°C, 2 hours. By this way, 94.254% high-purity chitin was produced.

Abstract: A castor oil-based UV-oligomer bearing benzophenone side chains (LU-5)was synthesis through two-step partial esterification reaction of polyacrylic acid with 4-hydroxy benzophenone and castor oil in the presence of N, N-diisopropyl carbodiimide and 4-(dimethylamino) pyridinium 4-toluenesulfonate(DPTS), then LU-5 was cured by UV irradiation with trimethylolpropane triacrylate(TMPTA) without any photoinitiator. The structure of the productions of the esterification reaction was characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance(NMR) and ultraviolet and visible spectrophotometer (UV-Vis), and the properties of UV cured polymer(FUV) has been studied. The results show that LU-5 has a certain light initiator activity, and it can be used as a macromolecular photoinitiator, the film of polymer has a certain degree of crosslinking.

Abstract: Applied self-prepared GY dispersant into 75% thifensulfuron WDG formulation,only chang the dispersant and filler content, found out the optimal amount of dispersant using zata potential analyzer. The results show that when the dosage of dispersant is 6%, zeta potential to achieve the most negative,75% tribenuron water dispersible granule apparent suspension rate of more than 90%. Zata potentiometric method is a rapid method that decide anionic dispersant dosage.

Abstract: In this study, We immobilized hydrogel material onto expanded polytetrafluoroethylene (ePTFE) film and used as an functional biomaterial. The material is a film containing titanium oxide onto polymer sheet. The hydrogel film is hydrophilic, bacterial inactivated and bio-compatible. In order to improve the ePTFE film biocompatibility, the cold plasma or γ-ray technology was used with acetic acid as monomer to deposit onto ePTFE film and then (N-isopropylacrylamide) was grafted onto the surface by radiation photo-grafting. The characteristics of the material surface were evaluated with X-ray photoelectron spectroscopy (XPS), FTIR and water contact angle. It was found that the contact angle of water on the untreated ePTFE significantly decrease from125° to 72° after ePTFE film being treated with acetic acid plasma deposition procedure. Due to the hydrophilicity of poly (N-isopropylacrylamide), so the contact angle of water on the ePTFE-g-NIPAAm almost approached to 0°. This thermal sensitive ePTFE hydrogels can be applied to artificial guiding tube and wound dressing material.

Abstract: A surfactant containing sulfonic group was used as pretreatment agent before polymer flooding. It can form a mixed absorption layer with the polar substances of rock surface. So the wettability of rock surface can be changed to some extent, and plugging near borehole zones which was caused by polymer injection can be decreased. Compared with the effects of different wettability reversal agents on the saturated static adsorption of polymer on rock surface, a wettability reversal agent with the best effect was selected to be used as pretreatment agent for anti-clogging in polymer flooding wells. Core displacement experiment showed that the pretreatment agent can prevent the polymer adsorbing on rock surface effectively, and the plugging rate and injection pressure of polymer flooding were reduced by more than 20% and 50% respectively.

Abstract: Poly(acrylic acid dodecyl ester-styrene-maleic anhydride) terpolymer (LA-St-MA) is synthesized by free-radical solution polymerization and is used for surface modification of glass fiber. Terpolymer is characterized by Fourier transform-infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC). Meanwhile, scanning electron microscopy (SEM) is adopted to observe surface properties of modified glass fiber. The results reveal synthetic terpolymer can be coated on glass fiber surface well and that modified glass fiber can be bonded well with polypropylene(PP).

Abstract: In this paper, 2-phenyl imidazole (2-PZ) microcapsule-type curing agent of epoxy resin were prepared through solvent volatilization with 2-PZ and polymethyl acrylic glycidyl ester (PGMA) as the raw materials. The micro-morphology, shape and structure of the microcapsules were studied by scanning electronic microscope (SEM) and fourier transform infrared spectrum (FT-IR). The curing kinetics of microcapsule curing agent/epoxy resin E-44 curing system were studied using TGA/DSC simultaneous thermal analyzer. Results showed that the preparation method is simple and effective and the prepared 2-PZ microcapsules have smooth surfaces and monodisperse size. And the curing kinetic study of epoxy resin system suggested epoxy resin curing temperature was rising with the increase of heating rate.