摘要:

AbstractDuring the past few years the automotive industry has shown increasing interest in evaluating reinforced plastic composites (R/PC) for structural parts. The selection of R/PC systems is limited by economics and performance criteria; such as the ability to withstand temperature extremes, fatigue or other specific criteria depending upon the part. High Strength Molding Compound (HSMC) appears to be a promising R/PC technology. These performance requirements have lead to the development of HSMC based on vinyl ester or polyester resins for compression molding of automotive structural parts. This paper discusses static and dynamic physical properties as they relate to formulation and environmental variables for compression molded vinyl ester resin high strength composites. Static property data on tensile and flexural strength and modulus; coefficient of thermal expansion and Poisson's ratio for vinyl ester resin systems with 1 in. randomly chopped glass fiber levels from 37 to 72 weight percent at temperatures from −20 to 302°F are present

ISSN:0272-8397    

DOI:10.1002/pc.750020202

出版商:Society of Plastics Engineers, Inc.    

年代:1981

数据来源: WILEY

摘要:

AbstractThermal properties of polystyrene composites with a filler showing a solid‐solid phase transition have been studied. Differential calorimeter analysis and typical insulation tests have been performed. An analysis of the experimental results has been done, by using the Stefan moving boundary theory, showing that it is inadequate to predict the thermal behavior of composites of the type studie

ISSN:0272-8397    

DOI:10.1002/pc.750020203

出版商:Society of Plastics Engineers, Inc.    

年代:1981

数据来源: WILEY

摘要:

AbstractA comparison of the flexural fatigue characteristics of E‐glass and Kevlar® 49 aramid in polyester and vinyl ester resin hand lay‐ups typical of boat hull laminates is presented. Data on unidirectional E‐glass and aramid composites from epoxy preimpregnated tapes are reported for comparison. The data indicate that while the initial flexural strength of E‐glass woven roving laminates is greater than that of aramid laminates, the runout stress of aramid laminates at 106fatigue cycles is similar or superior to glass. S‐N curves for aramid laminates are flatter indicating better flexural fatigue

ISSN:0272-8397    

DOI:10.1002/pc.750020204

出版商:Society of Plastics Engineers, Inc.    

年代:1981

数据来源: WILEY

摘要:

AbstractPolypropylene is one of the important thermoplastics that has been reinforced with glass fibers to give a reasonably good engineering plastic. Because of its inert nature, it does not easily adhere to the glass surface and hence some improvement in mechanical properties. In the present study a vinyltriethoxysilane coupling agent in polymeric form has been tried and seen to improve the properties. Tests have been carried out at (a) constant strain rate (in the Instron testing machine), and (b)constant stress rate (water loading on a biaxial testing machine). Under constant strain rate only tensile properties have been studied while under constant stress rate, the tensile, torsional and combined tensile‐torsional tests have been carried out. In each of the above cases, a considerable improvement in elastic modulus has been observed. The Tensile strength is improved to the extent of about 25 percent. There is only a slight improvement in torsional strength. Different fiber volume contents were used and their effect studied on modulus and strength. The mechanical data for reinforced‐polypropylene samples have been discussed in terms of the fiber‐length distribution in the composite. Detailed analysis of tensile data suggests that at low strains, when the critical length is relatively low, the fibers contribute to a high modulus. With increasing strain the critical length increases and the load carrying capacity of the fibers is reduced. Consequently the gain in strength is relatively less. The effect of fiber length distribution in torsion and combined tension‐torsion tests would be expected to be similar and the results seem to confi

ISSN:0272-8397    

DOI:10.1002/pc.750020205

出版商:Society of Plastics Engineers, Inc.    

年代:1981

数据来源: WILEY

摘要:

AbstractThe silane, PcSi(OH)(OSi(CH3)2(CH =2)), which has the potential of serving as a new type of coupling agent for fiber glass composites has been studied by UV resonance Raman spectroscopy. This silane is a member of a series of silanes which may lead to hydrolytically stable composites when used as coupling agents. Crystalline samples of the silane without glass and films on E‐glass fibers and high‐surface‐area silica at levels less than a monolayer have been investigated. The Raman line used in these investigations is at 1545 cm−1. This line is used because it gives a strong UV resonance Raman enhancement and because its frequency is dependent on the previous history of the sample. An attempt has been made to interpret the nature of the interaction of the silane with the glass surfaces in terms of the shifts of th

ISSN:0272-8397    

DOI:10.1002/pc.750020206

出版商:Society of Plastics Engineers, Inc.    

年代:1981

数据来源: WILEY

摘要:

AbstractComputerized infrared analysis is applied to the characterization of a glass‐reinforced crosslinked polyester. The method of factor analysis determines the number of independent components which constitute the polymeric matrix. Subsequently, the spectra of those components are fitted by a least‐squares criterion to spectra of the multicomponent matrix, or, if the glass spectrum is included as an additional component, to the spectra of composites. The least‐squares coefficients yield the matrix composition in terms of the initial reactant composition and the extent of crossli

ISSN:0272-8397    

DOI:10.1002/pc.750020207

出版商:Society of Plastics Engineers, Inc.    

年代:1981

数据来源: WILEY

ISSN:0272-8397    

DOI:10.1002/pc.750020201

出版商:Society of Plastics Engineers, Inc.    

年代:1981

数据来源: WILEY