Polyester resins are unsaturated synthetic resins formed by the reaction of dibasic organic acids and polyhydric alcohols. The process examined is a typical batch process. Potential of electrostatic field is characterized and methods for its measurement are discussed. This is mostly due to the existence of reasonable (-OH) groups on the particle surfaces. Different thermodynamic parameters like Gibb’s free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) of the undergoing process have also evaluated through these adsorption models. Rice husk is rich in amorphous silica which has found various applications as a filler in rubbers and plastics. Natural fibers, like the one investigated – Cissus quadrangularis stem fiber (CQSF), have proven thermomechanical properties for polymer composite reinforcement. unsaturated polyester unsaturated molecular weight polyester Prior art date 1994-12-27 Legal status (The legal status is an assumption and is not a legal conclusion. to measure the rate of burning (R.B) & ASTM: D-3014 to measure the maximum height of flame (H). . Mechanical properties such as tensile strength, elongation-at-break, tensile modulus, impact strength, water absorption, toughness, and surface hardness were tested after curing the resin in appropriate molds. The electrical and mechanical properties of the water-soluble insulating impregnation coating were also studied. The FTIR result confirms that the fatty portions have been successfully grafted onto the fiber after the chemical modification. . Za-prezentowano wyniki badań rozkładu potencjału elek-trostatycznego po wystąpieniu wyładowania elektro-statycznego z powierzchni badanego dielektryka wy-konanego na bazie żywicy poliestrowej. Herein, a novel reactive flame retardant containing multivalent phosphorus (-1 and +5), Badania rozkładu potencjału elektrostatycznego na powierzchni dielektryków stałych S t r e s z c z e n i e Ładunek zgromadzony na powierzchni dielektryków stałych, przewidzianych do stosowania w atmosferze wybuchowej, może stanowić potencjalne źródło zapło-nu, w związku z możliwością wystąpienia wyładowań elektrostatycznych snopiastych. This radical cure systems results in a resin that has a rapid cure time which is also tolerant to cold temperatures. The hyperbranched structure and C=C double bonds of HBUP resin were investigated by Fourier transform infrared (FTIR) and nuclear magnetic resonance (¹³C-NMR and ¹H-NMR) spectroscopies. wednesday 05 november 2003 1:00:00 am. The TEA–AIBN mixture decomposed easily because of the hydrogen-bonding action between TEA and AIBN. resin unsaturated polyester formulation glycols Prior art date 1993-06-18 Legal status (The legal status is an assumption and is not a legal conclusion. Hydrogen-bonding activation in the TEA–AIBN mixture was put forward, and this agreed with the NMR and Fourier transform infrared (FTIR) spectroscopy results. Academia.edu is a platform for academics to share research papers. A novel flame-retardant unsaturated polyester (UP) was obtained by introducing ammonium polyphosphate (APP) and aluminum hypophosphite (AHP) into UP matrix. Polyester resins such as these are of the ‘unsaturated’ type. Does not contain halogen or antimony trioxide. Due to its structural symmetry, the resulting polyester resin has obvious crystallinity, which limits its compatibility with styrene, so it is generally not used alone. Under these conditions, ρ was 0.39 ± 0.01 g/cm3, and the specific compressive strength was 33.92 ± 1.31 MPa g−1 cm−3. For Unsaturated Polyester, Vinyl Ester and Modified Acrylic Based Formulations Eliminate Halogens and Reduce Resin Consumption with Huber’s MoldX® Optimized Alumina Trihydrate (ATH) Products. materiałów nieprzewodzących w przestrzeniach zagrożonych wy-buchem. S u m m a r y Due to a possibility of occurrence of brush electro-static discharges, charge collected on the surface of solid dielectric materials intended for use in explosive atmosphere can be a potential source of ignition. The reaction was simplified by reacting the compounds in air at 60 °C for 6 h. Fourier transform infrared spectroscopy(FTIR) and thermal gravimetric analysis were con-ducted to characterize the treated fiber. Energia wyładowania elektrosta-tycznego jest związana z ładunkiem uwolnionym podczas wyładowania, który w przypadku wyładowań z powierzchni materiałów nieprzewodzących jest mniej-szy niż całkowity ładunek znajdujący się na powierz-chni materiału badanego. As unsaturated polyester resins contain carbon-carbon double bonds (C = C) in their structure, they become a hard and solid material that cannot be processed again by forming a network structure when they harden. We coat tapes made of fiberglass yarn with unsaturated polyester resin. An intercalated structure was observed for samples up to 3 wt.% of clay and an amplitude of 20% during sonication, corroborating the increase in flexural strength and lower values of coefficient of thermal expansion. Today, polyester is prepared by reacting diethylene glycol, HO–CH 2 –CH 2 –OH, and an unsaturated aliphatic acid such as maleic acid, HOOC–CH=CH–COOH. The experimental results showed that the UP composites with 30% (volume percent) of SA filler had lower density and better thermal insulation than the composites with the same amount of PS. 2 Posts Wednesday 11 August 2004 1:00:00 am. The optimal parameters of LDUPR manufacturing, including a ratio of TEA to AIBN of 0.4 and a dosage of TEA–AIBN mixture of 2.5 phr at a curing temperature of 60 ± 1 °C, were defined by the testing of the apparent density (ρ) and compressive strength of LDUPR. The unsaturated polyester component comprises from about 10% to about 100% of isosorbide-modified unsaturated polyester. Join ResearchGate to find the people and research you need to help your work. The tensile strength of the higher percentage was lowered due to the existence of large size particles and the elongation at break was decreased due to the restriction of the polyester molecular chain flexibility. canal system in eight teeth; the remaining seven molars were prepared for histological examination in cross-section in the coronal, middle, and apical thirds for study under the light microscope. The Cel-1 was immersed in concentrated hydrochloric acid to liberate the micro crystalline cellulose (cel-2). Mechanical properties such as tensile strength, elongation-at-break, tensile modulus, impact strength, water absorption, toughness, and surface hardness were tested after curing the resin in appropriate molds. The Cel-2 has been characterized by attenuated total reflectance infrared spectroscopy (ATR-IR), wide angle X-ray scattering, particle size analysis from the dry state, thermo-gravimetric analysis and scanning electron microscope (SEM). In the first step, the unsaturated polyester is formed by the polycondensation reaction of the dicarboxylic acids and the glycols. The possibility of interactions between carbonyl of the uPE and the hydroxyl of the Cel-2 was evaluated by ATR-IR. A stand- After stirring the mixture for 5 minutes the mixture was dived in 2 portions of 100g each. 8. The Cloisite 30B clay (1, 3 or 5 wt.%) was dispersed in the resin by mechanical stirring and sonication at different ultrasonic amplitudes (20% and 30%). The UP/APP/AHP composites obtained were characterized by Fourier Transform Infrared Spectra (FTIR). Polyesters of dicarboxylic acids with ethylene and diethylene glycol can be conveniently prepared with the use of KU-2 cation exchange resin in, In this work, aluminum tri hydroxide (I), zinc oxide (II) and their mixture (1:1) (III) were used as flame retardants for unsaturated polyester resin in the weight ratios of (0, 2, 4, 7, 10, and 12) %, by preparing films of (130*130*3) mm in dimensions. W przemyśle górniczym mogą one występować samodzielnie oraz jako części składowe urządzeń me-chanicznych i elektrycznych. ILLUSTRATIONS 3.1 Production and Sales Data on Unsaturated Polyester Resins in the United States . The unsaturated polyester normally blended with styrene to a reactive resin solution. Wall panels fabricated from polyester resins reinforced with fiberglass—so-called fiberglass reinforced … © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 695–708, 1998. Novel matrix resin formulations comprising isophorone diisocyanate-doped unsaturated isophthalate polyester in styrene monomer are particularly preferred. Preparation, Mechanical Properties and Fracture of the Optimal Surface Modified Alumina Silicate Bas... Synthesis of a novel highly effective flame retardant containing multivalent phosphorus and its appl... Badania rozkładu potencjału elektrostatycznego na powierzchni dielektryków stałych. Points are earned for both post-consumer recycled and rapidly renewable materials. . Unsaturated polyester resins (UP resins) are used as matrices in glass fiber reinforced composites in building construction, electrical engineering, marine and railway applications, for example [, , ].This is because of the low density, high strength to weight ratio, easy processing, electrical insulation and low cost of UP resins. The unsaturated polyester resin composition of claim 5, wherein the additional dialcohol is selected from the group consisting of 1,2-propylene glycol, 1,3-propanediol, ethylene glycol, diethylene glycol, dipropyleneglycol, neopentyl glycol, 2-methyl-1,3-propanediol, 2,2-dimethy-1,3-propanediol, 1,3-butanediol, and 1,4-butanediol and mixtures thereof. The preliminary investigations were carried out by batch adsorption. Unsaturated polyester resin . The-reafter, the SCL-reinforced unsaturated polyester(UPE) composites were prepared and characterized. 1. Unsaturated polyester resins are usually processed using a curing system consisting of initiator and accelerator introduced into the resin. The condensate obtained was mixed with styrene monomer to obtain at an unsaturated polyester resin formulation. The present work was aimed to study the adsorption of tetracycline, an antibiotic drug. The rate equations showed that the adsorption kinetic data generally fitted the rate equations from which the rate constants and diffusion rate constants were evaluated. Withdrawn Application number EP95309418A Other languages German (de) Eternal Materials Co., Ltd. was established in 1964. Unsaturated Polyester Resins: 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. 100G each were calculated at different temperatures ( 303-323 K ) the status! 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