N345b processing polyester resins for coatings applications. The toughness readily decreases until 50%, when a minimum is reached. Epoxy resin dgeba was toughened with 5, 10 and 15% by wt of unsaturated polyester using benzoyl peroxide as radical initiator and 4, 4. Unsaturated polyester resin was modified by replacing 15% styrene table5 by different acrylic monomers viz. Modification of unsaturated polyester resin was carried out in three neck flask equipped with stirrer.
Literature survey reveals that there are many reports about the synthesis and modification methods of unsaturated polyester resin 4149. Vacuum infusion and resin transfer moulding are growing techniques which allow reduced cycle times, improved mechanical properties, and better working conditions. These resins were cured using methyl ethyl ketone peroxide mekpo as an initiator and cobalt octoate as an accelerator. Jul 02, 2015 synthesis of unsaturated polyester resins from various bioderived platform molecules thomas j.
All the unsaturated polyester resins were viscous liquid, light yellow in colour and soluble in common organic solvents like acetone, methanol, chloroform and omf. During the first step low molecular weight synthesis of unsaturated polyester resin 265 figure2. Currently the unsaturated polyester resin is an important matrix resins for thermosetting polymer composites. Aslan s, immirzi b, laurienzo p, malinconico m, martuscelli e, volpe mg, pelino m, savini l 1997 unsaturated polyester resins from glycolysed waste polyethyleneterephthalate. A process for the preparation of an unsaturated polyester from a glycol and tetrahydrophthalic anhydride, maleic anhydride andor fumaric acid, suitable for the production of an unsaturated polyester resin rapidly loosing its surface tackiness after crosslinking, and furnishing very flexible materials which are resistant to creasing, is described. Pdf synthesis of unsaturated polyester resins from various bio. Synthesis and characterization of unsaturated polyesters for use in. When used to prepared unsaturated polyester resins, pet offers the combination of good elongation with high strength and heat resistance. Synthesis, characterization and properties of the new unsaturated polyester resins for composite applications by noorshashillawati azura binti mohammad thesis submitted in fulfilment of the requirements for the degree of master of science april 2007. An unsaturated polyester resin up resin is a solution of the unsaturated polyester in a lowviscosity monomer, which also contains carboncarbon double bonds. Oligopolyethylene terephthalate opet and oligocellulose oc were obtained by. Unsaturated polyester resins derived from renewable resources. Terephthalate resins synthesis and properties when using mpdiol glycol, preparation of the terephthalate resin is a remarkably easy.
Unsaturated polyester resins unsaturated polyester resins consist of two polymers, i. Synthesis of unsaturated polyester resin 265 figure2. Continuous online process control of polyester resins. Synthesized unsaturated polyester resin, stryrine and jute fiber along with benzoyl peroxide as catalyst were used for the composite preparation. Synthesis of unsaturated polyester resin from waste cellulose. Unsaturated polyester resins derived from renewable resources by dejan d. Download limit exceeded you have exceeded your daily download allowance. Fire resistant polyester resin 48 fire resistant polyester resins can be prepared by using halogenated dibasic acids e. The physical and mechanical properties of the cured samples were investigated. Synthesis of unsaturated polyester resins from various bio. Unsaturated polyester resin for specialty applications intechopen.
Unsaturated polyesters, usually strengthened by fibreglass or ground. Unsaturated polyesters resins uprs of maleic anhydride ma, phthalic anhydride pa and propylene glycol pg were synthesized using the fusion. In the course of curing, a threedimensional network is formed. Unsaturated polyester resin has been synthesized using different proportions of phthalic anhydride and maleic anhydride for the esterification with propylene glycol. In a recent work, we have reported the first successful preparation of a upest resin. Major objectives of this study were to synthesis and. The reaction is performed in the presence of water. Pdf synthesis of unsaturated polyester resins from. Verlag moderne industrie unsaturated polyester resins. Moreover, in synthesis of unsaturated polyester resins, it was observed that the reaction rate of glycolyzed ingredients prepared by cocatalytic system with anhydrides was higher than that of glycolyzed product made by zinc acetate. Unsaturated polyester resins from poly ethylene terephthalate. Us4312978a process for the preparation of unsaturated.
Methyl methacrylate mma, butyl methacrylate bma and acrylonitrile an. Unsaturated polyester resins from polyethylene terephthalate. At room temperature, the up is a highly viscous liquid or a brittle glasslike product with a low melting point. It was concluded that cyclohexyleamine has a catalytic effect on unsaturated polyester resin synthesis. The relatively low viscosity of unsaturated polyester resins and low curing temperatures, make them well suited for manufacture of large structures by use of these techniques. Modulus of upe as a function of the anhydride composition. Unsaturated polyester resin for specialty applications. This is a direct measure of the degree of polyesterification, since acid groups which have reacted to form ester groups will not react with koh.
Reactive and functional polymers 2007, 67 6, 549563. Synthesis of unsaturated polyester resins from various bioderived platform molecules thomas j. Unsaturated polyester resins from polyethylene terephthalate waste. Synthesis of unsaturated polyester resin from postconsumer. Pdf unsaturated polyester resins alaz tetik academia. Nov 23, 2011 compared to unsaturated polyester resin upr, the higher e a of fr. Abstractunsaturated polyester resin has been synthesized using different proportions of phthalic anhydride and maleic anhydride for the esterification with. Initially, maleic anhydride was allowed to react with propylene glycol for some time before the addition of phthalic anhydride. The molecular weight of the resin increased with reaction time and temperature as showed by gpc analysis fig. Synthesis of unsaturated polyester resins unsaturated polyester resins are complex polymers resulting from a crosslinking reaction of liquid unsaturated polyester with vinyl type monomers, most often styrene monomer such as in fig.
Dicyclopentadiene polyester resins are synthesized from dicyclopentadiene, maleic anhydride, and a gly col. The book basically deals with new raw materials for cost reduction of alkyds and unsaturated polyester, amino resins, polyester based resins, enzymatic synthesis of phenolic copolymers, radiation curable hybrid formulation, self polishing anti fouling, epoxy resins, epoxy resins from methyl epichlorohydrin, fillers. Pdf utilisation of bioderived platform molecules in polymer synthesis has advantages which are, broadly, twofold. Tensile strength of upe as a function of the anhydride composition. Some of the dicarboxylic acids contain carboncarbon double bonds, socalled unsaturated bonds.
Synthesis of unsaturated polyester resin effect of. Unsaturated polyesters upes are a large family of polymers with a wide range of applications stemming from their ability to undergo various. These synthesized unsaturated polyester resins could be used for various construction processes and materials such as no dig pipelining ndr1, pultrusion plr1 and polymer concrete pcr1. Synthesis of unsaturated polyester resins based on rosin acrylic acid adduct for coating applications. Physical properties of unsaturated polyester resin from glycolyzed pet fabrics. Pdf synthesis and characterization of unsaturated polyester. Unsaturated polyesters layered silicate nanocomposites. Acid value of unsaturated polyester resins is reported in table 2.
Synthesis and applications of unsaturated polyester. Mechanical and thermal properties of composites were evaluated. The detailed procedure for synthesis of an isophthalate upr with mpdiol glycol and the resultant properties of the cured resin can be viewed in a separate document 2238. Synthesis and applications of unsaturated polyester resins. Bulk polymerisation of bioderived unsaturated diacids has been employed to produce unsaturated polyester upes which have been analysed by gpc, tga, dsc and nmr spectroscopy, advancing on the analysis previously reported. During the first step low molecular weight unsaturated polyester resin 1. Synthesis of unsaturated polyesters for improved interfacial. Mwd of polyester resin was determined and disagreement was found compared to.
The invention relates to the acceleration of the synthesis of unsaturated polyesters containing maleic acidanhydride, 1 to 30 percent, preferably 5 to 15 percent of the prescribed maleic acidanhydride is introduced into the reaction mixture in total or in two or more increments at the stage of the reaction when the acid number or the molecular weight of the mixture has reached about 50 to. Abstract the incorporation of renewable resources in composite materials is a viable means to reduce environmental impact and support sustainability efforts in the composites industry. The automated resin processing apparatus figures 2 and 3 consists of three components. Synthesis of unsaturated polyester resins from pet wastes.
Synthesis of vinyl ester resins upev vinyl ester resins coded as upev were prepared in the present work by. Twostep synthesis of unsaturated polyester resins using maleic anhydride, isophthalic acid, and 2alkyl1,3propandiol and a vinyl monomer in the curing step. Firstly, the amount of hydroquinone used for inhibiting. Figure 2 diagram of automated apparatus for polyester resin synthesis processing polyester resins for coatings applications continued nitrogen supply agitator thermocouple stirring motor nitrogen. Unsaturated polyester resin uprc was synthesized from maleic anhydride ma and products of glycolysis. The resins may also be engineered to be suitable for mild corrosion resistant applications. Synthesis of unsaturated polyester resins the effect of various operation conditions on the upr synthesis was investigated. The curing reaction consists of a copolymerization of the vinyl monomer with the double bonds of the polyester. Synthesis of unsaturated polyester resin from waste. Synthesis of unsaturated polyester resin effect of anhydride composition. Unsaturated polyester resin has been synthesized using different proportions of phthalic anhydride and maleic anhydride for the esterification. Unsaturated polyester resin has been synthesized using phthalic anhydride, maleic anhydride, propylene glycol and adipic acid.
Green composites through the use of styrenefree resins and. Upon application of heat, liquid resin becomes cured rigid cured polymer is less temp. According to variations of the limited oxygen index loi values, the ul 94 rating of vertical burning test and scanning electron microscopy sem photographs of char residues, the flame retardance of cured fr. Pdf synthesis of unsaturated polyester resins from various.
Us4902773a method of preparation of unsaturated polyester. The obtained glycolyzed products were reacted with maleic anhydride and mixed with a styrene monomer to prepare unsaturated polyester upe resins. Synthesis of unsaturated polyester resineffect of anhydride. Pdf synthesis of unsaturated polyester resins from pet. Unsaturated polyester, any of a group of thermosetting resins produced by dissolving a lowmolecularweight unsaturated polyester in a vinyl monomer and then copolymerizing the two to form a hard, durable plastic material. Fundamentals, design, fabrication, and applications explains the preparation, techniques and applications relating to the use of unsaturated polyester resin systems for blends, interpenetrating polymer networks ipns, gels, composites and nanocomposites, enabling readers to understand and utilize the improved material properties that uprs facilitate. The resins were prepared by reacting glycidyl acrylate and glycidyl methacrylate with bisphenol a. Jan 16, 2008 three types of unsaturated polyester resins were synthesized from the glycolysis of polyethylene terephthalate pet plastic waste, considering environment, cost and properties for their applications. Synthesis of unsaturated polyester resin from glycolysed. Pg derived from these renewable sources and recycled. Effect of a novel cocatalytic system on glycolysis and polyesterification reactions.
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