A study has been performed to determine the effect of the use of divinyl benzene(DVB) as a crosslinking agent in polymeric binders consisting of mixtures of styrene, acrylonitrile, and acrylamide, on the thermal stability and structure of polymer concretes(PC), containing sand and cement as an aggregate. The results indicate that the inclusion of DVB results in improvements in the thermal and mechanical stability. The improvements are attributed to three‐dimensional cross‐linking of the polymer due to the inclusion of DVB. The influence of the sand‐cement ratio on the structure of PC samples at 240°C are also discussed.
SynopsisThe feasibility of using a copolymer composed of styrene, acrylonitrile, and acrylamide or methacrylamide in the formation of a high-strength thermally and chemically stable polymer concrete for use in geothermal environments has been demonstrated. Specimens produced with the copolymer in conjunction with an aggregate containing sand and portland cement had compressive strengths in the range of 25,000 to 30,000 psi a t 2OoC and were thermally stable up to -24OOC. A study of the effect of monomer concentration on the properties of the polymer concrete indicated that the optimum concentration is in the range of 12 to 13 wt. %. Increased monomer concentrations lead to a nonuniform polymer distribution within the composite, resulting in a deterioration of the properties. The optimum properties are obtained when the monomer is used in conjunction with a n aggregate containing 70 to 80 wt. % silica sand and 20 to 30 wt. % portlqd cement. The results from laboratory and field evaluations in progress indicate that the materials can be used for pipe or as protective liners on pipe and vessels in electric generating and direct utilization geothermal processes.
MTI;ISUTION OF m GXX~IT IS umm UNITED STATES DEPARTMENT OF ENERGY DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency, contractor or subcontractor thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency, contractor or subcontractor thereof.
SynopsisA series of polymer-concrete (PC) materials were evaluated in 30% hydrochloric acid a t 90°C. I t was shown that a polymer aggregated with quartz sand is a potential candidate for use in coating o r construction materials for hydrogen-chlorine energy storage systems. The results have shown that the corrosion rate of PC in this solution is a diffusion-controlled process. The major weight loss can be attributed to the presence of cement in the PC samples. The influence of the sand/cement ratio. and the crosslinking agent content on the corrosion of PC samples is also discussed.
SynopsisThermogravimetric (TGA) and infrared (IR) analyses were used to determine the thermal stability of a polymer system consisting of styrene-acrylonitrile-acrylamide-trimethylolpropane trimethacrylate. This study indicates that increases in curing temperature and the use of two initiators with different activities decreases the percentages of unreacted monomers. This increases the thermal stability of the polymer. To prove this, dynamic and isothermal TGA were used. The change in typical functional groups found by IR spectra also confirms this observation.
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