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Search Results: 1 - 10 of 2250 matches for " Phenolic Resin "
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Enhanced Thermal Conductivity of Carbon Nanotube Arrays by Carbonizing Impregnated Phenolic Resins  [PDF]
Dongmei Hu, Hongyuan Chen, Zhenzhong Yong, Minghai Chen, Xiaohua Zhang, Qingwen Li, Zhen Fan, Zhihai Feng
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.48055
Abstract:

A carbonization method is reported to improve the thermal conductivity of carbon nanotube (CNT) arrays. After being impregnated with phenolic resins, CNT arrays were carbonized at a temperature up to 1400°C. As a result, pyrolytic carbon was formed and connected non-neighboring CNTs. The pyrolysis improved the room temperature conductivity from below 2 W/m·K up to 11.8 and 14.6 W/m·K with carbonization at 800°C and 1400°C, respectively. Besides the light mass density of 1.1 g/cm3, the C/C composites demonstrated high thermal stability and a higher conductivity up to 21.4 W/m·K when working at 500°C.

The Synthesize and Property Evaluation of High Temperature Resistant Phenolic Resin-Type Profile Control Agent  [PDF]
Qingwang Liu, Hongwei Mu, Jigang Wang, Zhenzhong Fan
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.43019
Abstract:

Most of the mining method of domestic oilfield is waterflood development, thus the water content in the mid and late water flooding would rise faster, and the oil recovery rate would decline relatively more rapid. So it is very important to research profile control agent for stabilizing oil production resin-type profile control agent, and focus on researching the themal stability, shear resistance, gelation time and gelation strength and other properties of this profile control agent [1]. Finally, the best ratio for synthesizing the high temperature resistant phenolic resin-type profile control agent was obtained.

Sustainable Polymers Derived From Naturally Occurring Materials  [PDF]
Bimlesh Lochab, I K. Varma, J. Bijwea
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B056
Abstract:

Nearly 95% of monomers or chemical intermediates used today are based on fossilized carbon such as coal and petroleum. This has resulted in a high rate of depletion of fossilized reserves, continuous escalation in petroleum prices, environmental impact with the increase in emission of greenhouse gases, and accumulation of non-biodegradable waste on earth. Current global main challenges are moving towards green sources - need for vast new and sustainable material resources; supplement, reuse and replace petroleum based polymeric materials; biodegradability of materials to prevent build up of waste; toxicity associated with the preparation, usage and environmental safety. Recent investigations are therefore, focused on procuring materials from the plant resources, agricultural waste and their utility in synthesis of polymeric materials. Amongst the polymers derived from natural resources poly(lactic acid) is a leading candidate. Commercial quantities of natural oil-based polyols such as castor, soya bean oil have been available over the past several years and currently used for synthesis of  polyesters, polyurethanes etc, but today many other  natural materials are also being investigated. It should be possible to produce sustainable polymers commercially and economically.

 

 


 

Uso de resíduo industrial a base de resina fenólica como carga para o polipropileno
Cavalcante, André P.;Canto, Leonardo B.;
Polímeros , 2012, DOI: 10.1590/S0104-14282012005000031
Abstract: the aim of this study was to assess the technical feasibility of using industrial waste composed of phenolic resin, lignocellulose, calcium carbonate, talc, mica and carbon black as filler for polypropylene (pp). composites of pp with 10, 15 and 20 wt% of the waste were processed in a twin-screw extruder followed by injection molding. molded composites were characterized by scanning electron microscopy (sem), thermal analyses (dsc and tga), mechanical tests (tensile, flexural and impact) and thermo-mechanical test (hdt). the composites showed residue particles with sizes less than 500 μm dispersed in the pp matrix. the residue particles acted as nucleating agents for pp crystallization. the composites showed greater thermal degradation resistance as compared to pp. the composites showed a balance of stiffness and mechanical strength with increase of the flexural module and decrease of the tensile strength. the notched impact strength was not altered and the heat distortion temperature (hdt) of the composites was increased as compared to pp. the performance of the composites developed here showed that the industrial waste based on phenolic resin can be used as functional filler for pp. furthermore, these composites are an alternative for the recycling of the phenolic resin industrial waste.
Um modelo de condu??o do processo de outsourcing e um estudo de caso na indústria de processamento químico
Vernalha, Hercules B.;Pires, Sílvio R. I.;
Produ??o , 2005, DOI: 10.1590/S0103-65132005000200011
Abstract: studies related to the outsourcing process in several important non-leading industries worldwide and also regarding the existence of practical models and frameworks to guide the entire process and not only the decision-making stage are rare to find. in this context, this article presents a practical model to guide the whole outsourcing process, divided into four main stages (motivation, decision, implementation and management). it was successfully applied in a case involving two multinational companies operating in brazil, in a supply chain of the phenolic resin industry. the results highlighted mainly the adequacy of the proposed model, as well as the importance of constructing a partnership based on trust and integration by information technology.
Synthesis and Characterization of Hydroquinone Based Benzoxazines and their Polymers Using Solventless System
Aiban Ahmed Anam,Zeng Fandi,Marian Gryta,Wojeciech Balcerowiak
Journal of Applied Sciences , 2002,
Abstract: This paper concentrates on synthesis and characterization of benzoxazine based on hydroquinone, aniline and formaldehyde using solventless system. Suitable reaction condition was determined. The structure of benzoxazine has characterized by Nuclear Magnetic Resonance (NMR), Infrared (IR). The thermal properties were determined by Differential Scanning Calorimeter (DSC) and Thermo Gravimetric Analyzer (TGA).
Effect of Natural Fiber Reinforced Polypropylene Composite Using Resin Impregnation  [PDF]
Gibeop Nam, Nanqi Wu, Kazuya Okubo, Toru Fujii
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.513143
Abstract:
In this paper, we deals with mechanical performance of resin impregnation with natural fiber and fiber reinforced composites. The effect of the addition of a rein impregnation process on static strength of the injection molded composites was investigated by carrying out tensile and banding tests, followed by Scanning electron microscopy (SEM) observation of fiber surface and fracture surface of composites. The tensile strength of natural fiber and natural fiber reinforced composites with resin impregnation method increases with Polyvinyl alcohol (PVA) impregnation. In addition, Phenol resin impregnation recovers fiber tensile strength after alkali treatment. Resin impregnation causes decrease in contact surface area; however, it does not cause decrease in mechanical properties. Our results suggest that the using rein impregnation method has better effect on the mechanical properties of natural fiber reinforced Polypropylene (PP) composites.
Study of Maleic Anhydride Grafted Polypropylene Effect on Resin Impregnated Bamboo Fiber Polypropylene Composit  [PDF]
Gibeop Nam, Noboru Wakamoto, Kazuya Okubo, Toru Fujii
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.513141
Abstract:
Previously, Polyvinyl Alcohol (PVA) and phenolic resin were used for resin impregnated bamboo fiber reinforced PP composites which was manufactures for resin impregnated bamboo fiber with polypropylene (PP). Resin impregnation method can show improvement on tensile strength of fiber. However, to reduce the contact surface area and low inter-facial shear strength (IFSS) between impregnated resin and matrix, using 40% weight fraction of bamboo fiber in PP matrix, PVA impregnated composites with mean flexural and tensile strength 10% higher than untreated composites were produced butphenolic resin impregnated fiber reinforced composition’s mechanical properties were decreased. In this study maleic anhydride grafted polypropylene (MAPP) was used to increase interfacial shear strength between resin impregnated fiber and PP. With 10% MAPP, IFSS between resin impregnated fiber and PP increased more than 100% and reinforced composites. MAPP with untreated, phenolic resin and PVA impregnated cases showed similar mechanical properties. Yet in water absorption test, the PVA treatment with bamboo/PP composites increased water absorption ratio. But with 10% MAPP, matrix PP water absorption ratio decreased like phenolic resin impregnated fiber reinforced composites. 10% MAPP with resin impregnated bamboo fiber reinforced PP composites can improve IFSS, mechanical properties of composite and can decrease water absorption PVA resin impregnated bamboo fiber reinforced composites.
Shear Strength of Exterior Plywood Panels Pressed at Low Temperature
Pavlo Bekhta,Salim Hiziroglu,Olga Potapova,Jan Sedliacik
Materials , 2009, DOI: 10.3390/ma2030876
Abstract: Plywood manufactured from thin veneer sheets of different species is one of the most traditional structural composite panels. The objective of this study was to produce experimental plywood panels using a temperature of 100 °C, which is 10 to 30% lower than typical press temperature of plywood manufacture. It was determined that shear strength characteristics of the samples were not adversely influenced as function of reduced press temperature. This process can be considered as a promising way to save substantial amounts of energy during pressing processes, which results in a major reduction in overall production costs.
Dispersing carbon nanotubes in phenolic resin using an aqueous solution
Botelho, Edson C.;Edwards, Elilton R.;Bittmann, Birgit;Burkhart, Thomas;
Journal of the Brazilian Chemical Society , 2011, DOI: 10.1590/S0103-50532011001100004
Abstract: the ability to control the carbon nanotube (cnt) dispersion in polymers is considered the key to most applications of nanotube/polymer composites. the carbon nanotube dispersion into water with different surfactants, as well as its incorporation into phenolic resins, was investigated. ultrasonication of liquid suspensions was used to prepare stable dispersions. in order to evaluate the best surfactant to be used, light scattering and uv-visible spectroscopy were employed. the structure of cnt reinforced of phenolic resin was analyzed in function of the concentration and type of surfactant, sonication power and time. it was also evaluated the influence in the dispersion by using the glass temperature transition properties being obtained by dynamic mechanical analyses and impact energy.
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