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  • 1
    Electronic Resource
    Electronic Resource
    Studies on a fiber reinforced plastics honeycomb structure (1994)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 15 (1994), S. 217-222 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on an adhesive and fabric screening program, a rubber-modified resole adhesive and a flexible grade plain weave glass fabric were found appropriate for the fabrication of a glass-reinforced plastics honeycomb core material. Sandwich structures of different densities were fabricated. A linear regression analysis was performed to correlate the mechanical properties (S) with the density (p) for a wide range of sandwich structures based on honeycomb and cellular plastic core materials. An analytical model of the form S = Kρn was derived, with two empirical constants K and n. The density exponent n was between 1 ≤ n ≤ 2 in all cases. An equation was also derived to relate density with thermal conductivity. The dynamic mechanical analysis (DMA) results revealed that the glass transition temperature of the resin matrix associated with the sandwich structure was higher than that of the corresponding facing laminate or near resin casting.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750150307
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Acrylonitrile-triethylene tetramine adduct hardener systems for epoxy resin (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 2711-2721 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Triethylene tetramine (TETA) has been chemically modified to different extents using acrylonitrile (AN) as chain extender for the hardener system of epoxy resin. The modified hardeners have been characterized and used to make epoxy casting and glass reinforced composites. The neat epoxy matrices have been evaluated in terms of mechanical and thermal properties, while their glass fibre reinforced composites have been characterized mechanically. It has been observed with neat resin casting that the Izod impact strength increased from 14.89 to 67.17 kJ/m2, but the Rockwell hardness and glass transition temperature decreased from 83.1 to 30.8 and 146.2 to 59.7°C, respectively, as the extent of modification of TETA increased through the utilization of 0 to 3 mol AN for epoxy curing. Hardener based on adduct of 1 mol TETA and 3 mol AN was found most suitable for making epoxy prepreg with 1 month shelf life at -5°C.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070411118
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Role of polyester resin on the epoxy matrix system (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 855-865 
    Details
    ISSN: 0887-6266
    Keywords: interpenetrating polymer network (IPN) ; antiplasticization ; thermal analyses ; fracture mechanism ; scanning electron microscope (SEM) ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Interpenetrating polymer network (IPN) as a polymer blend matrix was prepared using different ratios of polyester (PE) to epoxy (E) resins. It was observed that 11.33 wt % PE in the blend provides maximum mechanical properties, particularly the modulus for the casting, and such a blend is referred to as “optimum casting” (OC). The density of the blends containing up to 11.33% PE, especially of OC, was found to have increased by the presence of PE in the E network significantly more than would have been estimated from the calculation based on the rule of additivity. The thermal expansion coefficient parameter (Δαi) of the OC was found to be 2.68 × 10-4K-1. The scanning electron micrograph (SEM) of the fracture surface of OC only showed a glass-like smooth surface. The change in the mechanical properties due to the varying proportions of PE in the blend was studied critically on the basis of failure mechanisms and morphological features. The differential thermogravimetric analysis (DTGA) of OC indicated only one peak in spite of the presence of two resin constituents, whereas castings with an excess of PE in the blend showed multiple peaks. Interestingly, as far as the DTGA is concerned, a domain of seemingly OC origin was found to remain, even in the blends containing PE resin above its optimum level (〉 11.33 wt %). ©1995 John Wiley & Sons, Inc.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090330601
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    Paper (German National Licenses)
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