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amorphous polymers

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550385
EISBN: 978-1-62708-307-2
... Abstract Polymer-matrix composites are among the lightest structural materials in use today. They are also highly resistant to corrosion and fatigue and their load-carrying capabilities, such as strength and stiffness, can be tailored for specific applications. This chapter discusses the...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870063
EISBN: 978-1-62708-314-0
... densities, one method of toughening a thermoset polymer is to lower the crosslink density. This approach, when taken to the extreme case in which there are no more crosslinks, results in a thermoplastic polymer. Since amorphous thermoplastic polymers are inherently tough, the more the crosslink density is...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.9781627083195
EISBN: 978-1-62708-319-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550621
EISBN: 978-1-62708-307-2
... Abstract This chapter consists of three parts. The first part provides data and guidelines for selecting materials and processing routes. It compares the basic properties of metals, ceramics, and polymers, identifies important measures of performance, and discusses manufacturing processes and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870573
EISBN: 978-1-62708-314-0
... series of SiC fibers are the most prevalent. Nicalon fibers are produced by a polymer pyrolysis process that results in a structure of ultrafine β -SiC particles approximately 1 to 2 nm dispersed in a matrix of amorphous silicon oxide and free carbon. Fiber manufacture consists of synthesizing a...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870401
EISBN: 978-1-62708-314-0
... Abstract This chapter describes the conditions under which environmental degradation is likely to occur in polymer matrix composites and the potential damage it can cause. It discusses the problems associated with moisture absorption and exposure to solvents, fuels, ultraviolet radiation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550569
EISBN: 978-1-62708-307-2
..., continuous fiber ceramic composites, and carbon-carbon composites. It also describes a number of ceramic-matrix composite processing methods, including cold pressing and sintering, hot pressing, reaction bonding, directed metal oxidation, and liquid, vapor, and polymer infiltration. ceramic-matrix...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550325
EISBN: 978-1-62708-307-2
... point when the crystalline regions start dissolving. As the polymer approaches its melting point, the crystalline lattice breaks down and the molecules are free to rotate and translate, while noncrystalline amorphous thermoplastics exhibit a more gradual transition from a solid to a liquid. In general...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290279
EISBN: 978-1-62708-306-5
... successfully. During welding, the glass transition temperature ( T g ) in amorphous polymers and the melting temperature ( T m ) in crystalline polymers must be exceeded so that the polymer chains can acquire sufficient mobility to interdiffuse. A variety of methods exist for welding thermoplastics and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870183
EISBN: 978-1-62708-314-0
... the glass transition temperature T g for amorphous resins or above the melt temperature T m for semicrystalline materials. Fig. 6.1 Typical thermoplastic composite process cycle. Source: Ref 1 As a general rule, the processing temperature for an amorphous thermoplastic composite...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870285
EISBN: 978-1-62708-314-0
... polymers, as shown for the epoxy and nylon matrices in Table 10.1 . Table 10.1 Glass-filled epoxy and nylon strength and stiffness Property Unfilled epoxy Glass-filled epoxy, 35% Unfilled nylon Glass-filled nylon, 35% Glass-filled nylon, 60% Density, g/cc 1.25 1.90 1.15 1.62...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110587
EISBN: 978-1-62708-247-1
...) typically consist of a porous Ta anode (for high surface area) with a Ta wire attached to it. The dielectric, amorphous Ta 2 O 5 , typically a few tens of nm thick, is electrochemically grown on all surfaces of the porous Ta-anode [1] . Liquid electrolyte, MnO 2 , or conductive polymer are three commonly...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870031
EISBN: 978-1-62708-314-0
... well to complicated shapes and is very difficult to machine. Other high-temperature ceramic fibers, such as silicon carbide (Nicalon), aluminum oxide, and alumina boria silica (Nextel), are frequently used in ceramic-based composites but rarely in polymer-based composites. The stress-strain curves in...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870373
EISBN: 978-1-62708-314-0
... 10.9 8.70 13.4 13.1 Poisson’s ratio 0.28 0.34 0.25 0.27 The largest publicly accessible database for composite materials is the MIL-HNBK-17 series ( Ref 1 to 5 ). Volume 2 contains databases on polymer matrix systems, and Volumes 4 and 5 contain information on metal and ceramic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870489
EISBN: 978-1-62708-314-0
.... Therefore, it is important to do the upfront work carefully before the detailed design starts. In the materials selection process, a broad choice can be made between the use of composite construction, metals, unreinforced polymers, and natural materials. As a general...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420363
EISBN: 978-1-62708-310-2
... and polymers are mostly amorphous. The atomic packing factor (APF) and coordination number (CN) of the important crystalline structures can be calculated from their geometries. Plastic deformation takes place by sliding (slip) of close-packed planes over one another...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.9781627083096
EISBN: 978-1-62708-309-6
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... polymers are mostly amorphous. In metals, unlike the ionic or covalent bonding in ceramics, the free electrons in the metallic bond are what lead to these characteristic properties such as good conduction of heat and electricity. A crystalline structure consists of atoms, or molecules, in a regular...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550511
EISBN: 978-1-62708-307-2
... used metals. Applications include heat exchangers, automotive engine components such as turbocharger rotors and roller cam followers, power generation components, cutting tools, biomedical implants, and processing equipment used for fabricating a variety of polymer, metal, and ceramic parts. Major...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2