Advanced Materials Research Vol. 624

Abstract: In this paper the mobility and factots affecting mobility of phenyl silicone rubber is studied. The results showed that the crystallinity of phenyl silicone rubber was declined because of the presence of phenyl and the higher the phenyl content, the lower the crystallinity when the phenyl content was low. The viscosity of the phenyl silicone rubber was rised as molar mass and phenyl content of the rubber was increased but the changes was not uniform. The viscosity of the phenyl silicone rubber was declined as temperature was increased and viscosity-temperature dependence of the high molar mass phenyl silicone rubber was larger. The influence of shearing on the viscosity and mobility of the phenyl silicone rubber were evident.

Abstract: Abstract. The effect of styrene-The effect of hydroxy-terminated polybutadiene liquid rubber (HTPB) and softened agent on the performance of epoxy resin are studied. The mechanical properties of the composites investigated and the toughening mechanism were studied trough the SEM. In the HTPB/epoxy resin composites, the hardness is reduced but the elongation and the shear strength increased . Added 20wt%HTPB, the breaking elongation can be up to 16.19% and the shear strength rise to 13.74MPa. From the images of the SEM, the globular and trumpet-like hole and shear zone can hinder the development of the cracks, thus increasing the toughness of the epoxy resint. In the softened agent/epoxy resin composites, The addition of the softened agent, the breaking elongation and the impact strength have increased. From the images of SEM,we found that ,with the addition of the softened agent ,the single phase structure turns to two-phase structure and the bicontinuous phase and the brittle fracture turns to ductile fracture.

Abstract: PNA012 is a new nucleating agent on polybutylene terephthalate. The effect of different dosage of PNA012 on crystallization and mechanical properties were investigated by means of differential scanning calorimetry, universal testing machine, melt flow indexer and vicat softening testing machine. It was revealed that the PNA012 could substantially accelerate the crystallization of PBT. Compared with the pure PBT,the crystallization temperature of PBT/PNA012 rises from 196.3 °C to 199.7 °C and crystallization degree from 34.2% to 39.9%. The tensile Strength of PBT/PNA012 is increased 9.7%. The Bending Strength has a rise of 9.3% and the heat distortion temperatures of PBT/PNA012 is increased from 115.07°C to 125.94°C.

Abstract: This paper mainly concerned the effect of nucleating agents CAV101 on PLLA crystalline property. CAV101 was mixed with poly (L-lactic acid) (PLLA) to make PLLA/CAV101 blends, with CAV101 contents of 0, 0.1%, 0.3%, 0.5%, 0.7%, respectively. Mechanical performances, morphology and crystalline properties were investigated by tensile test, WAXD, SEM. The results demonstrated that the tensile strength and elongation of PLLA increased with the increase of CAV101 content and the maximum value at CAV101 of 0.3% and 0.5%, respectively. The crystallinity of PLLA blends CAV101 of 0.1%, 0.3%, 0.5%, 0.7% were 86.58%, 82.43%, 49.01%, 64.00% respectively.The SEM investigation found that the agglomeration of PLLA with the increasing of nucleating agents CAV101 content.

Abstract: In the homogeneous system, the low molecular weight Chitosan is obtained by H2O2 oxidation degradation method. Acetyl Sulface reacted by the mixture of Acetic Anhydride and Concentrated Sulfuric Acid at equal proportion is the reagent. low molecular weight Chitosan being as raw materials, Vulcanized Oligomer Chitosan is sulfonated with good water-solubility and high sulfur content under certain conditions. It has been tested for the influence of the usage of sulfonated reagent, reaction temperature and reaction time on Sulfer content. The best condition for preparation Vulcanized Oligomer Chitosan is 5ml of Acetyl Sulface with the reaction temperature of 25°C and time of 5 Hours. It’s a new potential heparin with around 100 nm particale size tested by spectral analysis and SEM measurements, which could be a new reagent in other fields.

Abstract: Talc was modified by aluminate coupling agent (ACA) before filling it into high density polypropylene (HDPP) to prepare talc/HDPP composites. Scanning electron microscopy (SEM), wear testing machine, electronic universal testing machine, and impact testing machine were used to analyze the surface modification and the effects of modified talc on friction and mechanical properties of modified talc/HDPP composites. The results indicate that after modified the lamellar structure of talc particles are open and the dispersion of particles are improved, and the edges and corners of surface become softer. Friction properties indicate that when the talc content is 8 wt%, both µ and K are at a lower value, which show that have better wear resistance. The frictional surface is relatively smooth and no furrow trace has found. Mechanical properties show that with talc content increasing, tensile strength and flexural strength of composites increase.

Abstract: Natural Stellerite has a big reserve volume, but has some shortcomings which are irregular ducts and Connotation impurities and so on. So, it is necessary to use Stellerite to prepare zeolite X for enhancing purity and property. It tests Products by XRD, FT-IR and Stereo Microscope. The study shows that optimum parameter is n(SiO₂)/n(Al₂O₃)=3, n(Na₂O)/n(SiO₂) =1.1-1.2 and n(H₂O)/ n(Na₂O)=30-40. The gel ages at room temperature for 12 h, and then keeps at 95 °C for 7h. The pure zeolite X could be prepared.

Abstract: Zeolite A was prepared from natural stellerite under hydrothermal conditions.The experiments were carried at different crystallization temperatures and times，the experimental results and synthetical factors were analyzed and researched. The end products have been characterized by using FT–IR, X–ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that zeolite A was synthesized on the condition of the crystallization temperature at 90~100°C and the crystallization time for 6 hours with 15% hydrochloric acid of stellerite modifying，according to certain proportion of stellerite.

Abstract: In this paper, Pd/Rh series catalyst substrate samples were prepared at the different cell density, with different volume. The fresh catalyst aging treatment. And Catalysts test by light-off factor (LOF). The results tested demonstrated that, it can achieve equal performance levels with the cell density is 600cpsi that the catalyst sample of the cell density is 400cpsi with the precious metal content for the 1.2g/L. This is more efficient for low content of noble metal catalysts. This work is still importantly to promoted catalyst stability, that the catalyst structure is optimized. And it can be used as the interaction between cell density and noble metal content of catalysts.

Abstract: In this paper, Pd/Rh series catalyst substrate samples were prepared at the same cell density, with different volume. The fresh catalyst aging treatment. And Catalyst test by light-off factor (LOF). The results tested demonstrated that, for the same cell density of substrate, the increase of substrate volume benefited to obtain lower light-off temperature. It was effective measurement that higher cell density enlarged the operating window of catalyst. When the volume of substrate increased by 40%, catalyst light-off temperature decreased 5～10°C, the range of the air-fuel ratio is enlarged in 0.43. And it is role equivalent to the density of the cell density in additive quantity of 50% or Pd/Rh in additive quantity of 20%.