Papers by Author: Guang Yi Lin

Abstract: Unsaturated polyester resins are widely used in the manufacture of fiber reinforced plastics and shipbuilding industry. Their undesirable mechanical property may bring about disadvantages. The nanoparticles were added to the polymer material, which will strengthen the performance of the polymer material. AROPOL G102 / Clay Nanocomposites were prepared by magnetic stirring apparatus at room temperature. The result showed that nano-montmorillonite can effectively increase the mechanical property of the material.

Abstract: Extrusion and molding is one of the most important manufacturing processes of short fiber-rubber composite material. In order to be used to tire tread, the short fibers in rubber are wanted to be radial orientated. But the orientation of short fibers depends on the die structure, and the performances of short fiber-rubber composite material depend on the radial orientation degree of short fibers. So, the die structure has been studied by experiments in order to get a proper die structure for manufacturing of short fiber-rubber composite material. The experimental results indicate that the proper die structure parameters are: the molding length is 15mm, the molding height is 9mm, the channel length is 75mm, the channel height is 12mm and the channel angle is 135º.

Abstract: Epoxy resin / clay nanocomposites prepared by shock wave method. The structure and mechanical properties including hardness, stress, strain and elongation at break were investigated. XRD was used to observe the interlayer spacing of the OMMT and SEM was used to survey the morphology of nanocomposites system. The results indicated that nano-montmorillonite can effectively increase the mechanical property of the material. The nano-montmorillonite was well dispersed in the epoxy matrix. The optimal process condition is that shock time 5min, nano-MMT content of 5%, duty cycle 1:3, shock depth 3cm.

Abstract: In order to improve the dispersion degree of carbon black and other additives, reduce consumption of energy and the temperature of discharging rubber compound, our research has been focused on preparation of rubber compound with different rubber particle size at filling coefficient of 0.6 and 0.7 in the mixer. The power consumption, the temperature of discharging rubber compound and the dispersion of carbon black were characterized in this study. The mechanical properties of the rubber compound have also been tested. The results indicate that reducing the particle size of rubber can reduce the consumption of energy and the temperature of discharging rubber compound and improve the mechanical properties, which is very important in rubber industry

Abstract: Rotor Speed is an important factor which impacts the mixing process and quality of mixed rubber greatly. The effects of different rotor speeds on manufacturing process of short fiber-rubber composite material have been studied by experimental study. In the experiments, the rotor speeds were 50rpm, 60rpm, 70rpm and 80rpm respectively. The experimental results indicated that the mixed rubber after vulcanized had better physical and mechanical properties as the rotor speed was 70rpm. So the rotor speed that is 70rpm has been chosen for manufacturing short fiber-rubber composite material.

Abstract: The curing behaviour of an epoxy/OMMT nanocomposites system which was composed of a bifunctional epoxy resin with an anhydride curing agent and OMMT was investigated. Differential scanning calorimetry (DSC) was used to investigate the curing behaviour of the nanocomposites system. As for the nanocomposites system containing different amounts of OMMT, the values of activation energy, reaction order, theoretic gelling temperature and theoretic curing temperature were evaluated by kinetic equations. And the effect of OMMT on the curing reaction and the curing reaction mechanism of the system were discussed. The results showed that the curing process is at 100°C for 1hr, 170°C for 2hr when the OMMT content is 3%. XRD was used to observe the interlayer spacing of the OMMT and SEM was used to survey the morphology of nanocomposites system.

Abstract: The NR/SBR/oranoclay nancomposites were prepared by mechanical mixing method. The dispersion of the oranoclay in the rubber matrix was characterized by X-ray diffraction and scanning electron microscopy. And the effects of different filler and contents on the mechanical properties were investigated. The results showed that the particles of organoclay can be dispersed homogeneously in the rubber matrix. Compbination of carbon black and organoclay shows the synergistic effect which lead to high tensile strength. In addition, organoclay can decrease the Mooney viscosity which is useful for processing. The method is simple, which can be used industrially for use of organoclay in elastomer.

Abstract: A systematic study has been carried out to investigate matrix properties by introducing nmSiO2 fillers into an epoxy resin matrix. The study has revealed that with shock wave method, nanoparticle infusion brings about superior mechanical properties to the matrix than what is usually given by the other method. The nmSiO2 is dispersed in a high-energy liquid shock wave pressure processing. The resulting structural composites have been tested under tensile loads to evaluate mechanical properties. Shock wave mixing utilized high-energy, high voltage transient shock wave in the water medium to process the material lying in the focal area. Nanoparticles tend to reduce void content of the nanocomposites and thus translate into increased mechanical properties. Focused, the influence of the high-energy shock wave method on the mechanical properties of nanocomposite were systematic studied. Using different processing conditions, the experiments were done to find the best processing. Overall, shock wave method is shown as a promising methode for preparation of aerospace epoxy composites.

Abstract: The curing behaviour of an epoxy/nmSiO2 nanocomposites system composed of a bifunctional epoxy resin with an anhydride curing agent and nmSiO2 was investigated. Differential scanning calorimetry (DSC) was used to investigate the curing behaviour of the nanocomposites system. As for the nanocomposites system containing different amount of nmSiO2, the values of activation energy, reaction order, theoretic gelling temperature and theoretic curing temperature were evaluated by kinetic equations. And the effect of nmSiO2 on the curing reaction and the curing reaction mechanism of the system were discussed. The results showed that the curing rate of the nanocomposites system increased slightly with adaptively increasing nmSiO2 content, and the curing process is at 110°C for 1hr, 150°C for 2hr.

Abstract: A series of aromatic hyperbranched polyethers have been synthesized from cyanuric chloride and diols by using nucleophilic displacement polymerization technique. The synthesized sulfur containing polyether was blended with commercially available low density polyethylene (LDPE) and plasticized poly(vinyl chloride) separately to improve the flame retardant property of those linear polymers. The flame retardancy of blends at different dose levels of the hyperbranched polyether with those linear polymers was investigated by measurement of limiting oxygen index (LOI) value and thermogravimetric analysis. The LOI values and TG analysis of these blends indicated that the hyperbranched polyether act as flame retardant additive.