Papers by Keyword: Phenol Formaldehyde Resin

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Authors: Yang Min Zhou, Lin Tian, Gang Xie, Rong Xing Li, Xiao Hua Yu
Abstract: Cold ramming paste was successfully synthesized used electro-calcined anthracite (ECA) and artificial graphite as aggregate and phenol-formaldehyde (PF) resin as binder. Synthesized paste was measured by electrical resistivity, compressive strength, Infrared Spectrum (IR) and Thermo Gravimetry (TG), etc. The results show that the synthesized paste has some excellent physical properties such as low electrical resistivity and high compressive strength, all of which can meet industry requirements. Thermal decomposition and condensation of the paste can be divided into four stages by TG. Finally, it is found that the synthesized cold ramming paste is an ecofriendly material by the toxicity measurement of gas phase escaping from the heated paste
1208
Authors: Hai Yang Yu, Xiang Jun Liu, Wen Juan Ji, Hai Tao Gao, Bin Bin Xu
Abstract: Polymer gel is widely used in water shut-off and profile control. For success of conformance treatment, it is very important to study the dynamic gelation process of polymer gel, especially in porous media. Based on the systems of HPAM/ phenol formaldehyde resin (PFR), the dynamic gelation process in porous media was studied in an unconsolidated sandpack of the circulating device. The results showed that dynamic gelation time was much longer than static gelation time in ampoule bottle and porous media. With permeability increasing or injected speed decreasing, the dynamic initial gelation time increased but the dynamic initial gelation time varied unconspicuously. In dynamic gelation process, the system of HPAM/ PFR could be injected into in-depth of reservoir more easily. The relationship between permeability and apparent viscosity was in accordance with equation y=a (1-e-bx). The apparent viscosity after dynamic gelation was in contrast with linear velocity of b.
718
Authors: Shi Feng Zhang, Jian Zhang Li, Xiao Ying Liu, Yan An Ou, Qiang Gao
Abstract: For increasing the curing rate and decreasing the curing temperature, modified phenol-formaldehyde (PF) resins were synthesized under a complex catalyst. The bonding strength and formaldehyde emission of the plywood bonded by them were measured according to Chinese National Standards methods. The curing behavior was conducted by differential scanning calorimetry (DSC) measurement. The results indicate that PF resins catalyzed by the complex catalyst show more moderate pH values, lower curing temperature and shorter gel time comparing with control ones. Plywood bonded with modified PF resins shows good bonding strength and low formaldehyde emission even at low hot press temperature (110 °C), which is closed to the plywood bonded with normal control PF resin at high hot press temperature (130 °C).
2124
Authors: Ai Ju Li, Qiang Yin, Kang Ning Sun, Lei Shao
Abstract: Using carbon nanotubes (CNTs) treated with Fenton/ultra-violet (UV) as reinforcement and phenol formaldehyde resin/graphite(PF/G) composite as matrix, a new composite for bipolar plate is fabricated by hot-pressing. The effects of different molar ratios of Fe2+ and H2O2 on the surface of the CNTs, the bend strength and conductivity of the composite produced are investigated. It is found that the surface of CNTs will be purer with the decreasing of the concentration of Fe2+; that a large quantity of hydroxyl groups and few carboxyl groups can be brought on the sidewalls of CNTs when the mole match of Fe2+ and H2O2 is 1:40; that the bend strength and conductivity of the composite increase initially and then decrease with the decreasing of mole match of Fe2+ and H2O2; and that the bend strength and conductivity of the composite can reach their best values when the mole match of Fe2+ and H2O2 is 1:40, corresponding 72.5MPa and 185.6 S•cm-1, respectively.
933
Authors: Chuan Bai Yu, Chun Wei
Abstract: Reinforced phenol formaldehyde resin (PF) matrix nanocomposites with different nano-SiO2 were fabricated with two-roll compounding and compression molding technology. The mechanical and tribological behaviors of the reinforced composites were studied. The friction and wear experiments were tested on a constant speed machine (D-SM). The impact and flexural strength of nanocomposites were increased by the addition of various types of SiO2, but the flexural modulus was decreased. The effects of the addition of various types of SiO2 on tribological properties of the composites were explored in this study. The results showed that the coefficient of friction of the composites increased, while the wear rate values decreased at various temperatures. Microstructure of worn surface of the tested composites was observed by scanning electronic microscope (SEM) and the wear mechanism of the reinforced composites was studied.
1772
Authors: Samaresh Ghosh
Abstract: Novel hyperbranched phenol-formaldehyde (HBPF) resin 1 has been prepared for the first time. Thorough characterizations (FT-IR, NMR, HPLC, MALDI-TOF MS and elemental analyses and rheological flow behavior) were performed to ascertain the structure of HBPF 1. The condensationcuring event of HBPF with diglycidylether of bisphenol-A (DGEBA) has been studied by differential scanning calorimetry (DSC) technique.
177
Authors: Jin Sun, Rui Hang Lin, Xiao Bo Wang, Xiao Feng Zhu, Zhen Zhong Gao
Abstract: The novel adhesives were prepared using PF resin as matrix and sodium silicate as modification additive. It was proved by Fourier transform infrared spectrometer (FTIR) that silicon-oxygen bonds had been successfully introduced to the structure of PF resin. Boiling water extraction (BWE),scanning electron microscopy (SEM),thermogravimetric analyzer (TGA) and differential scanning calorimetry (DSC) were used to characterize the structure of PF resin modified with sodium silicate (Na2SiO3-PF). The test results show that sodium silicate is an effective modifier to PF resin which lessen the brittleness, accelerate the cure rate and enhance the boiling water resistance of PF resin as well. The FTIR,TGA and DSC test results also show that the structure of PF resin has been changed by sodium silicate.
1198
Authors: Shu Heng Liu
Abstract: A new polymer amine modified phenyl phenol cresol resin preparing reports, physico-chemical constants and the ability to dissolve resin was determined, on the basis ofthe resin and the ring emulsion resin curing were studied.
665
Authors: Wei Qiang Wang, Ai Ju Li, Ming Ming You, Bin Xia
Abstract: Composites of phenol formaldehyde (PF) resin/graphite reinforced by milled carbon fibers (MCFs) for bipolar plates are obtained by hot compression molding. The raw materials of the MCF particles, PF resin powder and graphite powder are simply dry powder ball milled and mixed. The effects of PF resin content and the content, granularity and surface treatment methods, such as air oxidation and Fenton/ultraviolet (UV) liquid-phase oxidation of MCFs on the electrical conductivity and flexural strength of the composites are measured by methods of four-point probe technique and three point flexural test, and the fracture patterns of the composites are analyzed by scanning electron microscope (SEM). The results indicate that the electrical conductivity decreases and flexural strength increases with the increase of PF resin content. Especially, the values of electrical conductivity and flexural strength can reach 165.28 S.cm-1 and 55.11MPa respectively when the PF resin content was 17% in weight. The properties of composites reinforced by air oxidation treated MCFs are better than those by liquid-phase oxidation treated one. The electrical conductivity and flexural strength of the composites are 208.12S.cm-1 and 57.44 MPa when they reinforced by 5% MCFs which treated by air oxidation at 450 . Compared with the nonreinfoced composites, the properties of reinforced composites increase 25.92% in electrical conductivity and 4.23% in flexural strength.
1090
Authors: Lian Xiang Ma, Na Zhang, Gang Yang, Yan He
Abstract: In order to improve the thermal conductivities of composites, AlN are used as thermal conductive fillers of EPDM rubber. The contact angle and surface free energy of AlN and modified AlN are studied. The influence filler amount and the surface treatment of AlN which coated by phenol formaldehyde resin (PF), on the thermal conductivities and mechanical properties of composites material are also investigated. The results show that the surface free energy of modified AlN is lower than unmodified, so the modified AlN are easier dispersion in the matrix. Through the TGA analysis, it can give a quantitative analysis of the surface coating thickness. With the increase of the filler, the thermal conductivities of composites are all on the rise, while the mechanical properties decreased in different degree. The modified AlN have active impacts on the thermal conductivities and harmful to mechanical properties of the filled EPDM rubber.
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