Through melt blending route, using an epoxy group-containing reactive toughening A compatibility agent CX-3 to modify recycling PC/ABS alloy compound. The structure and mechanical properties of the alloy were measured by DMA, scanning electron microscopy. The results show that when the ratio of the material quality is PC:ABS:CX-03:A= 70:30:2:4, synergies compatible with the toughening agent getting most evident. Reactive epoxy groups can occur with the PC ring-opening reaction of hydroxyl end groups which has little effect on the tensile properties of the material, the stiffness and toughness of material can get perfect balance. Mechanical properties of alloy achieve the best.
The hydrophobically modified technology of water soluble polymers applies to hydrogel research, which can largely improve the performance of traditional hydrogels. Therefore, this method has been a hot research topic in hydrogel research. In this paper,the research progress of hydrophobic hydrogels,based on hydrophobically modification of chemical hydrogels, block copolymer hydrogels and graft copolymer hydrogels,is reviewed.
A series of polyether demulsifiers with straight chain, branched chain, and hyperbranched dendritic structures combined with reverse demulsifier were used to treat the emulsion of hydrophobically associating polymer flooding. The influence of polyether demulsifier molecular structure on the demulsification was assessed via bottle test experiments. The results revealed that the synergistic effect of hyperbranched polyamide-amine polyether demulsifiers and reverse demulsifier was specially effective for the emulsion of hydrophobically associating polymer flooding. The demulsification effect was enhanced by improving the content of ethylene oxide(EO), and the optimum mass ratio of EO / PO(propylene oxide) was1/1. It was found that the values of interfacial tension and dilational modulus between oil phase and water phase decreased significantly when a polyether demulsifier was added. Therefore, the demulsification mechanism may be that the demulsifier molecules was adsorbed at the oil-water interface due to its high interfacial activity, and then the intensity of the visco-elastic interfacial film was break down, which resulted in breaking emulsion.
According to the plugging rate and recovery factor, the plugging performance was studied by physical simulation experiment. The results of experiment indicate that the average diameter of SMG particle prepared by 27.7×104mg/L brine change very small at 84℃. Nano SMG can flow in core and produce more than 50% plugging rate. Micron SMG is inapplicable to low-permeability reservoir. In the later stage of high water cut, SMG particles can further enhance oil recovery.
The super absorbent resin was synthesized by aqueous solution polymerization, using acrylic acid(AA), 2-acrylamide-2-methyl propane sulfonic acid(AMPS), starch and organic-montmorillonite(OMMT) as the main material, ammonium persulfate as initiator and N,N-methylene diacrylamide as cross linking agent. The effect of the temperature, the ration of AMPS and the amount of OMMT on the absorption properties of super absorbent resin were studied. The distilled water and saline water absorption capacity of the high super absorption resin obtained under the optimal conditions were 774g/g and 116g/g, respectively.The composites were also characterized by FTIR, XRD and SEM.
PA6/PP-g-MAH/ Er2O3fiber materials were successfully prepared through melting extrusion. The research focused on the structure and performance characterized by DSC, FTIR; study on the effects of Er2O3modified nylon 6on the mechanical properties by detection melt index, tensile strength and elongation at break of composite samples. The results showed that the strength and elongation at break of as-formed fibers were improved 51% and 10.6% as the content of Er2O3reach 4 phr. At the same time, the Crystallization temperature and melting temperature were reduced, and the melt flow rate increased.
The prepared methods of porous materials polyHIPEs by high internal phase emulsion template was reviewed. The applications of porous materials polyHIPEs were introduced. And the research prospects and potential applications of these materials were also pointed out.
Shape memory waterborne polyurethane(SMWPU) was synthesized with poly-1,4-butylene adipate glycol(PBA) and isophorone diisocyanate(IPDI) as raw material, trishydroxymethyl aminomethane(TOAM) as crosslinking monomer by the prepolymer dispersion method. The effects of dosage of crosslinking monomer TOAM on the properties of waterborne polyurethane emulsion and its film were investigated. Shape memory properties of film was characterized.The results showed that: With increasing of the dosage of TOAM, the viscosity of emulsion increased firstly and then decreased, the particle size increased firstly and then tended to stabilize, the tensile strength increased and elongation at break decreased, the hard segments showed amorphous and soft segment crystallinity decreased;when the mass fraction of TOAM was 4.5%, the shape recovery rate could reach 90.15%.
In order to improve the monomer conversion rate, and reduce the content of volatile organic compounds(VOC), environmentally friendly styrene acrylic emulsion which has ultra-low VOC content and steady performance was prepared through adding a kind of natural olefins such as sunflower seed oil, which has double bond and can participate in the copolymerization with other monomers. In this paper, the emulsion polymerization of ultra-low VOC(269.7ppm) environmentally styrene-acrylic emulsion was carried out by pre-emulsification, semi-continuous polymerization, in which styrene, butyl acrylate, acrylic acid and sunflower seed oil were used as main materials. The effect of composite emulsifier content and initiator content on monomer conversion rate,coagulum rate, emulsion particle size and viscosity was investigated.Meanwhile, the related performance of the prepared styrene acrylic emulsion was characterized and tested.
The article focuses on using dimethyldimethoxy silane as raw materials, with adjusting the dosage of water, selecting ion exchange resin as catalyst and methanol as thinner, to prepare segment number of between zero and one hundred methoxy terminated siloxane oligomers. The results show that, with the dimethyl dimethoxy silane dosage being 1 mol and the water being between zero and zero point ninety-nine mol, we can obtain the segment number of between zero and one hundred methoxy terminated polydimethyl siloxane oligomers. With the ion exchange resin concent among the total weight being 2%, the yield of methoxy terminated polydimethylsiloxane oligomers is 96%, and the usage of methanol is above 80%, its yields are being maitainned about 95%; When the temperature is being kept at 70℃, the ones are up to 94 %, which reduced the hydrolysis and condensation of the methoxyl group among silane and the byproducts are formed due to the silane closed-loop reactions.
Factors influencing the migrate characteristic of polymer microsphere YG-370-5 through individual pore throat of low permeability cores were investigated using a visual flowing micro-channels experiment model. Those factors included displacement pressure, oilfield temperature, polymer microsphere mass concentration and micro-channel diameter. The results show that the threshold pressure gradient of polymer microsphere is in the micro-channels with diameter of 5μm and the injection flow ratio is in linear relations with the threshold pressure gradient. As the polymer micro-sphere mass concentration of microsphere increased,the plugging rate increases. When the microspheres are displaced at the pressure of 0.6 Mpa, the flow rate in micro-channels with diameter of 10μm is 3~10 times larger than that of 5μm. There is no polymer micro-sphere in micro-channels with diameter of 2μm. The experiments indicate that temperature has little impact on the plugging performance between 65℃ and 85℃.
Using the melt impregnation device developed at our laboratory, glass fibers reinforced polyoxymethylene(LGF/POM) composites were produced. Dynamic mechanical properties of LGF/POM composites have been investigated by using dynamic moehanical thermal analysis(DMA). The results indicated that glass fibers contents and scanning frequency had some effect on dynamic mechanical properties of LGF/POM composites. The storage modulus of LGF/POM composites were found to increase with increasing of glass fibers contents. Increasing of scanning frequencies, the damping peaks of LGF/POM composites decrease. The Arrhenius relationship has been used to calculate the activation energy of α-transition of LGF/POM composites. In addition, effects of glass fibers contents on mechanical properties of LGF/POM composites were carried out.
The pour point depressant(PPD) of octadecyl acrylate-maleic anhydride copolymers were synthesized by free radical polymerization. The orthogonal test proved that the appropriate ratio of polar group and non-polar group in polymer structure was very important for performance of PPD, and various length carbon chains were also necessary in PPD side chain. The morphology change of paraffin in oil observed by polarizing microscope demonstrated the mechanism was cocrystallization between PPD and paraffin. The addition of PPD could prevent the formation of three-dimensional network. The rheology experiments indicated the addition of PPD could enlarge the range of Newtonian fluid, reduce the viscosity,and change fluid types of crude oil, which led to the improvement of cold flow properties of waxy crude oil.
The effect of europium oxide on thermo-oxidative degradation behavior of HDPE and thermal decomposition kinetics of Eu2O3/HDPE composite have been studied by thermogravimetry(TG) and differential scanning calorimeter(DSC). With addition of europium oxide, the temperature at 5% weight loss can be dramatically enhanced. The thermal decomposition kinetics results showed thermal oxidation decomposition reaction of Eu2O3/HDPE composite was first order reaction. The apparent active energy of thermo-oxidative degradation reaction of HDPE was increased when europium oxide in presence. Europium oxide is not involved directly in the main chain scission of HDPE, which show the effect of europium oxide is related with oxygen.
Using toluene diisocyanate(TDI), hybrid hydrophilic polyether polyols, trimethylolpropane(TMP) and 1, 4- butanediol(BDO) and 3, 3 '- dichloro- 4, 4'- diamino diphenyl methane(MOCA), as the main raw materials, to prepare single-component water swelling polyurethane elastomer by using prepolymers method. The results show that the preferably comprehensive performance of elastomer is achieved when the weight of polyethylene glycol and polypropylene glycol ratio is 80/20 and the cyanate resin mass fraction is 4.2Wt%, and the elastomer performance using mixed TMP/MOCA chain extender is better than using TMP/BDO.
Mechanical and damping properties of NBR with various filler were studied. The results showed that there is a significant impact on the mechanical and damping properties of NBR with the filler type and content. As the amount of filler reached 30phr, the tensile strength and hardness showed an increasing trend, and at the meantime the elongation at break decreased. When the content of the filler was more than 30phr,the tensile strength and the elongation at break were on the decline,and the hardness first increased and later decreased. At different frequencies, the damping loss factor which varies with different kind of fillers resulted in the different damping properties.
Monodispersed polystyrene microspheres?with narrow size distribution was obtained via dispersion polymerization of styrene in the methanol medium,using AIBN and polyvinylpyrrolidone as initiator and dispersant,respectively.The microspheres were characterized by fourier transform infrared spectroscopy(FT-IR)、scanning electron microscopy(SEM)、laser particle size analysis(LPS).The influence of PVP content on microsphere products were studied.The results show that: the monomer conversion rate increases with the increase of the dosage of PVP,the particle size of PS microspheres decreases with the increase of dosage of PVP,the size distribution widen after first narrowing.When the dosage of PVP is 1.5%,the obtained PS microspheres with narrowest size distribution and best monodispersity.A series of different size of PS microspheres can be get by changing the anount of PVP.
In this paper, the main types of polyethylene(PE) and their applications were introduced.Furthermore, the production processes of high density polyethylene(HDPE), low density polyethylene(LDPE) and linear low density polyethylene(LLDPE) were concluded in details, and the latest progress of all production processes were also summarized.
This article focuses on rosin glyceride, naphthenic oil 4010, PIB dosage of three kinds of continuous phase and the matrix effect on the properties of medical adhesive hydrocolloid dressings, and to make a preliminary discussion on its mechanism of action. The results show that With the increase of dosage of rosin glyceride, hydrocolloid dressings, initial adhesion and 180° peel strength are a drop in after the first rise, when 23.36% of rosin glyceride, viscous force and at the beginning of 180° peel strength peaked at the same time; Naphthenic oil content of 4010 was 9.90% at the beginning of peak viscosity and 180° peel strength, continue to increase its dosage, initial adhesion and 180° peel strength decreases sharply; With the increase of dosage of PIB, initial adhesion and 180° peel strength increases gradually, reached the maximum when the content of PIB was 12.90%, continue to increase its dosage and initial adhesion 180° peel strength decreased.
Graphite oxide(GO) was prepared by modified Hummers method, and organical modified graphene oxide(OGO) was obtained by modifying with cetyl-trimethyl ammonium bromide(CTAB). High fluidity PA6/OGO composites were prepared by melt blending and the mechanical properties of composites were investigated. The results showed that the mechanical properties of composites were improved, when OGO content is 0.6 wt%, the mechanical properties of composites is optimize, the tensile strength increased by 17.8%, the elongation at break increased 4.7% and the flexural modulus increased 40.8%. The presence of OGO improves the mechanical properties of high fluidity PA6.
