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Totally found 309 items.

  • [会议] EFFECT OF PHENOLIC RESIN ON THE CHARACTERISTICS OF ACTIVATED CARBON PREPARED USING LIGNIN EXTRACTED FROM INDUSTRIAL WASTE BLACK LIQUOR
    Biomass-based industrial waste is increasingly interested in academia and industries due to its low cost and renewable applicability. Black liquor is a biomass-based waste industrially obtainable from the chemical pulping process [1]. Lignin is dissolved into black liquor with hemicellulose and other components. It can easily be extracted from black liquor [2,3]. It has been reported that the biomass product exhibits some potential as a precursor for preparing activated carbon [4]. The aim of the present study is to investigate the effect of phenolic resin incorporated into lignin derived from industrial waste black liquor on the specific surface area and the thermal stability of activated carbon derived from black liquor.
    关键词: -
  • [会议] Effect of environmental friendly filler on thermal properties of areca Phenolic resin composites
    The objective of this work is to develop environmental friendly fire retardant areca Phenolic composites by adding environmental friendly Pongamia pod powder as filler. Thermal properties such as Thermogravimetric Analysis (TGA), Coefficient of Thermal Expansion and Thermal Conductivity are investigated and analyzed. When the composites are exposed to heat above the glass transition temperature of resin matrix, this leads to reduction in stiffness and strength of material and degrades the mechanical properties due to thermal degradation and combustion of the resin. This poor fire resistance of composites has been a major factor to limit their wide spread of applications. Composites require high flame retardancy which can be obtained by adding a filler material. Thus improving the thermal properties and fire retardant behaviour of polymers was a main challenge for extend their use to most of the applications. In fabrication of composite specimen process, the proportion of the Phenolic resin (primary phase) was fixed to 65% by volume. It is mixed with varying proportion of areca Fibre (5%, 10%, 15% and 35%) and Pongamia shell powder (30%, 25%, 20% and 0%) by volume to weight ratio and represented by APC05, APC10, APC15 and APC35 respectively. Thermal properties improved with increase in Pongamia shell powder. Thermal stability, fire resistance properties increases with increase in Fibre proportion. It is expected optimum composition of the current work APC15 will be used in Aircraft industries, Aerospace applications, Chemical industries, Electrical systems and Electronics, Automobiles, Shipbuilding, wind turbine blades, Thermal encapsulation, Flip chip applications, Thermal interface materials.
    关键词: -
  • [会议] Influence of cross-linking agent on the hydrophobicity of microencapsulated ammonium polyphosphate with tung oil phenolic resin
    Ammonium polyphosphate(APP) was encapsulated with different cross-linked structure tung oil phenolic resin(TPF) by in situ polymerization and it was performed that a study on the influence of the cross-linking agent type on the hydrophobicity of the APP microcapsules.The chemical and physical features of APP microcapsules were characterized by Fourier transform infrared(FTIR),X-ray photoelectron spectroscopy(XPS).The hydrophobicity was assessed by the water contact angle(WCA).The results showed that the APP microcapsules with different cross-linked structure TPF shell had been achieved successfully and the cross-linking agent type had important influence on the hydrophobicity of APP microcapsules.
    关键词: Ammonium polyphosphate;microencapsulation;tung oil phenolic resin;cross-linking agent;hydrophobicity
  • [会议] AN INVESTIGATION OF THE MELT, FLOW AND CURE BEHAVIOR OF PHENOLIC RESIN DURING PROCESSING OF CARBON BONDED CARBON FIBER INSULATION
    CBCF insulation is made from chopped and carbonized rayon fibers bonded by carbonized phenolic resin. The melt, flow and cure behavior of the resin was investigated by several advanced techniques that provided insight into the current process and a promising pathway for making near term improvements.
    关键词: -
  • [会议] Mesoporous Phenolic Resin Catalysts and Their Use in Asymmetric Epoxidation and Aldol Reactions
    Ordered mesoporous phenolic resins are an advanced class of ultra-stable mesoporous materials that offer potential applications in the field of catalysis.Two select examples of asymmetric catalysis will be presented.First,the Jacobsen catalyst N,N'-bis(3,5-di-tert-butylsalicylidene)-l,2-cyclohexanediaminomanganese(Ⅲ) chloride is covalently immobilized and highly dispersed on mesoporous phenolic resins through a direct and simple procedure.This novel catalytic system shows high catalytic activity and excellent enantioselectivity in the asymmetric epoxidation of diline.The heterogeneized Jacobsen catalyst is demonstrated to be a re-usable and zero-leaching catalyst system.In a second example,the mesoporous phenolic resins were functionalized with sulphonic acid groups and acted as novel support for the non-covalent immobilization of a L-phenylalanine derived chiral diamine organocatalyst for asymmetric aldol reactions.The immobilization is established by an acid-base interaction between the sulphonic acid group and the amine function.The acidity and in particular the electronic withdrawing environment of the sulphonic acid groups influence enormously the catalytic performance of the non-covalent immobilized chiral diamine catalyst.
    关键词: covalent;resins;diamine;Jacobsen;phenolic;catalysis;dispersed;chiral;immobilization;phenylalanine
  • [会议] Synthesis and carbonization of nickel-modified thermoplastic phenolic resin
    The use of formaldehyde and phenol as raw materials, under the acidic catalyst, the high temperature polymerization produces a thermoplastic phenolic resin. At low temperatures, modified nickel sulfate is added to synthesize Ni-modified thermoplastic phenolic resin, and carbonization is carried out at high temperature. The effects of carbonization temperature, carbonization heating rate and nickel doping amount on the carbonization product are investigated. Experiments have shown that the optimal conditions for the Ni-modified thermoplastic phenolic resin. The molar ratio of formaldehyde to phenol is 0.85, oxalic acid accounts for 2% of the mass of phenol. The reaction temperature is 100° C. The reaction time is 2 h. The molar ratio of iminodiacetic acid to phenol is 0.03, and the molar ratio of nickel sulfate to phenol is 0.04. The combined temperature is 60° C and the chelating time is 40 minutes. The pyrolytic carbon of the nickel modified phenolic resin is characterized by field emission electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the best carbonization temperature is 10 °C/min at 1100°C for 3 h, and a large number of carbon nanotubes are formed in the pyrolytic carbon.
    关键词: -
  • [会议] Study on the preparation of carbon nanotubes by iron modified phenolic resin pyrolysis
    An iron modified phenolic resin was synthesized by grafting ferric ions into a phenolic resin structure through a coordination reaction. Carbon nanotubes were prepared by high temperature pyrolysis of phenolic resin under the protection of argon gas. The CNTs were characterized by SEM, Raman and TEM. The effects of iron content, temperature and time on the formation of carbon nanotubes were studied. The results show that when the content of iron is 0.005, the yield of carbon nanotubes in the pyrolytic carbon is the highest, and the optimal time and temperature for the pyrolysis of iron modified phenolic resin to generate carbon nanotubes are 3h and 1000°C, respectively. The process of high temperature pyrolysis of iron modified phenolic resin to produce carbon nanotubes follows the 'melting carbon-carbon precipitation' mechanism, generating a tube diameter of 80 to 100 nm, a length of several tens of micrometers and a complete structure with about 20 layers of wall thickness multi-walled carbon nanotubes.
    关键词: -
  • [会议] Study on the preparation of carbon nanotubes by iron modified phenolic resin pyrolysis
    An iron modified phenolic resin was synthesized by grafting ferric ions into a phenolic resin structure through a coordination reaction. Carbon nanotubes were prepared by high temperature pyrolysis of phenolic resin under the protection of argon gas. The CNTs were characterized by SEM, Raman and TEM. The effects of iron content, temperature and time on the formation of carbon nanotubes were studied. The results show that when the content of iron is 0.005, the yield of carbon nanotubes in the pyrolytic carbon is the highest, and the optimal time and temperature for the pyrolysis of iron modified phenolic resin to generate carbon nanotubes are 3 h and 1000℃, respectively. The process of high temperature pyrolysis of iron modified phenolic resin to produce carbon nanotubes follows the "melting carbon-carbon precipitation" mechanism, generating a tube diameter of 80 to 100 nm, a length of several tens of micrometers and a complete structure with about 20 layers of wall thickness multi-walled carbon nanotubes.
    关键词: Study on the preparation of carbon nanotubes by iron modified phenolic resin pyrolysis
  • [会议] Effect of environmental friendly filler on thermal properties of areca Phenolic resin composites
    The objective of this work is to develop environmental friendly fire retardant areca Phenolic composites by adding environmental friendly Pongamia pod powder as filler. Thermal properties such as Thermogravimetric Analysis (TGA), Coefficient of Thermal Expansion and Thermal Conductivity are investigated and analyzed. When the composites are exposed to heat above the glass transition temperature of resin matrix, this leads to reduction in stiffness and strength of material and degrades the mechanical properties due to thermal degradation and combustion of the resin. This poor fire resistance of composites has been a major factor to limit their wide spread of applications. Composites require high flame retardancy which can be obtained by adding a filler material. Thus improving the thermal properties and fire retardant behaviour of polymers was a main challenge for extend their use to most of the applications. In fabrication of composite specimen process, the proportion of the Phenolic resin (primary phase) was fixed to 65% by volume. It is mixed with varying proportion of areca Fibre (5%, 10%, 15% and 35%) and Pongamia shell powder (30%, 25%, 20% and 0%) by volume to weight ratio and represented by APC05, APC10, APC15 and APC35 respectively. Thermal properties improved with increase in Pongamia shell powder. Thermal stability, fire resistance properties increases with increase in Fibre proportion. It is expected optimum composition of the current work APC15 will be used in Aircraft industries, Aerospace applications, Chemical industries, Electrical systems and Electronics, Automobiles, Shipbuilding, wind turbine blades, Thermal encapsulation, Flip chip applications, Thermal interface materials.
    关键词: -
  • [会议] Synthesis and carbonization of nickel-modified thermoplastic phenolic resin
    The use of formaldehyde and phenol as raw materials, under the acidic catalyst, the high temperature polymerization produces a thermoplastic phenolic resin. At low temperatures, modified nickel sulfate is added to synthesize Ni-modified thermoplastic phenolic resin, and carbonization is carried out at high temperature. The effects of carbonization temperature, carbonization heating rate and nickel doping amount on the carbonization product are investigated. Experiments have shown that the optimal conditions for the Ni-modified thermoplastic phenolic resin. The molar ratio of formaldehyde to phenol is 0.85, oxalic acid accounts for 2% of the mass of phenol. The reaction temperature is 100° C. The reaction time is 2 h. The molar ratio of iminodiacetic acid to phenol is 0.03, and the molar ratio of nickel sulfate to phenol is 0.04. The combined temperature is 60°C and the chelating time is 40 minutes. The pyrolytic carbon of the nickel modified phenolic resin is characterized by field emission electron microscopy(SEM) and energy dispersive spectroscopy(EDS). The results show that the best carbonization temperature is 10 °C/min at 1100°C for 3 h, and a large number of carbon nanotubes are formed in the pyrolytic carbon.
    关键词: Synthesis and carbonization of nickel-modified thermoplastic phenolic resin
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