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molecular weight distribution

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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
... strength, and elongation. Plasticizers lower melt viscosity and processing temperature. Fundamentally, they function by broadening the molecular weight distribution and increasing the low-molecular-weight fraction of the total composition. Plasticizers are essentially nonvolatile solvents. In...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.9781627082815
EISBN: 978-1-62708-281-5
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
... matrices for advanced composites are classified as either thermosets or thermoplastics. Thermosets are low molecular weight, low viscosity monomers (≈2000 centipoise) that are converted during curing into three-dimensional crosslinked structures that are infusible and insoluble. Crosslinking ( Fig. 3.1...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420429
EISBN: 978-1-62708-310-2
... fuels for heating and melting. Moisture and liquid metal can react to form molecular hydrogen according to: (Eq B.4) x M + y H 2 O → M x O y + y H 2 where M is the metal, and x and y are stoichiometric coefficients balancing the equation. At the high...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290243
EISBN: 978-1-62708-306-5
... solid form that possess high tackiness, resulting in bonding when pressure is applied. Formed from various polymers of high molecular weight. Can be single or double sided. Shear strength to 49 MPa (7100 psi), tensile strength to 40 MPa (5800 psi). Applications: solar panels, electronic assemblies...
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 November 2010
DOI: 10.31399/asm.tb.scm.t52870489
EISBN: 978-1-62708-314-0
... molecular weight polyethylene (UHMWPE), such as Spectra. It has a low density with excellent radar transparency and a low dielectric constant. Because of its low density, it exhibits very high specific strength and modulus at room temperature. However, being polyethylene, it cannot withstand temperatures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290279
EISBN: 978-1-62708-306-5
... variety of plastic joining techniques are available as outlined in Fig. 10.4 . Fig. 10.4 Classification of different plastic joining processes. Source: Ref 10.2 Plastic parts can be broadly classified as either thermosets or thermoplastics. Thermosets are low-molecular-weight, low...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550385
EISBN: 978-1-62708-307-2
..., including lighter weight, the ability to tailor lay-ups for optimum strength and stiffness, improved fatigue strength, corrosion resistance, and, with good design practice, reduced assembly costs due to fewer detail parts and fasteners. The specific strength (strength/density) and specific modulus (modulus...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130133
EISBN: 978-1-62708-284-6
... usually larger than atomic or molecular dimensions Segregation —In the casting process, the solidifying front moves away from the surface of the casting as a plane front, and lower-melting-point constituents in the solidifying alloy are driven toward the center. This is called normal segregation...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... horizontal axis. For a given temperature and chemical composition, the phase diagram shows what phase or phases are present in the alloy under conditions of thermal equilibrium. Thermal equilibrium means that the average molecular kinetic energy (i.e., temperature) is assumed to be uniform and steady so that...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440055
EISBN: 978-1-62708-262-4
... temperature of the surface of a part is elevated, the heat flow to the center is by a molecular mechanism. Conduction involves the transfer of kinetic energy from one molecule to another in a chain reaction. Heat flow continues until equilibrium occurs. The time involved depends on the conductivity of the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420239
EISBN: 978-1-62708-310-2
... invariant reaction in a binary system must be constant. (The reaction line must be horizontal.) The liquidus should not have a discontinuous sharp peak at the melting point of a compound. (This rule is not applicable if the liquid retains the molecular state of the compound, i.e., in the situation of an...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.9781627082617
EISBN: 978-1-62708-261-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550569
EISBN: 978-1-62708-307-2
.... Silicon-carbide-matrix continuous fiber CMCs are designed for applications where high thermal conductivity, low thermal expansion, light weight, and good corrosion and wear resistance are required. Alumina-matrix continuous fiber CMCs are better in applications where a high tolerance to salt corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870201
EISBN: 978-1-62708-314-0
... migrate across the ply interfaces to obtain good ply-to-ply bonding. The movement of polymers in the fibers is modeled by reptation theory for molecular movement, with the degree of autohesion D au defined as: (Eq 7.7) D au = S S ∞ where S = bond strength at time t...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.9781627082587
EISBN: 978-1-62708-258-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.9781627083003
EISBN: 978-1-62708-300-3
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740325
EISBN: 978-1-62708-308-9
... from less than 3 to 50 μm (0.1 to 2 mils). Coating weight (grams per square meter of coated area), rather than coating thickness, has been adopted as the basis for expressing the amount of coating deposited. Three principal types of phosphate coatings are in general use: zinc, iron, and manganese. A...