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molecular configuration

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730099
EISBN: 978-1-62708-283-9
... Abstract This chapter discusses the structural classifications, molecular configuration, degradation, properties, and uses of polymers. It describes thermoplastic and thermosetting polymers, degree of polymerization, branching, cross-linking, and copolymers. It also discusses glass transition...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780359
EISBN: 978-1-62708-281-5
..., thermogravimetric analysis, thermomechanical analysis, and dynamic mechanical analysis. The article also discusses various analytical methods used to characterize the molecular weight distribution of a polymeric material. It provides information on a wide range of mechanical tests that are available to evaluate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780028
EISBN: 978-1-62708-281-5
... Abstract This article describes in more detail the fundamental building-block level, atomic, then expands to a discussion of molecular considerations, intermolecular structures, and finally supermolecular issues. An explanation of important thermal, mechanical, and physical properties of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780305
EISBN: 978-1-62708-281-5
... Abstract This article discusses the molecular mechanism, environmental criteria, and material optimization of environmental stress crazing (ESC) in glassy thermoplastics, polyethylenes, and nylons. In addition, it provides information on various tests used to determine relative susceptibility...
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
... Abstract This chapter describes the molecular structures and chemical reactions associated with the production of thermoset and thermoplastic components. It compares and contrasts the mechanical properties of engineering plastics with those of metals, and explains how fillers and reinforcements...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780343
EISBN: 978-1-62708-281-5
... pertinent to structure analysis. This is followed by a review of the characterization of plastics by infrared and nuclear magnetic resonance spectroscopy. The article then provides information on the distribution of molecular weight of an engineering plastic. It further discusses the methods used in thermal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870031
EISBN: 978-1-62708-314-0
... Abstract This chapter discusses the properties and processing characteristics of glass, aramid, carbon, and ultra-high molecular weight polyethylene fibers and related product forms, including woven fabrics, prepreg, and reinforced mats. It also includes a review of fiber terminology as well as...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300301
EISBN: 978-1-62708-323-2
... Abstract This chapter covers the friction and wear behaviors of plastics and elastomers. It begins by describing the molecular differences between the two types of polymers and their typical uses. It then discusses the important attributes of engineering plastics and their suitability for...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780115
EISBN: 978-1-62708-281-5
... glassy and above which the plastic becomes rubbery. The T g is also a measure of the onset of long-range molecular movement in the plastic. Because the transition from glass to rubber is not a thermodynamic transition, but rather a manifestation of viscoelasticity, the exact value of the T g...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780003
EISBN: 978-1-62708-281-5
.... Once the cross-linked molecular network forms during this curing process, reapplication of temperature and pressure, even in excess of cure requirements, will not melt-flow the resin system out of shape. Network polymers do not have real glass-transition temperatures, and they degrade (depolymerize) at...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290035
EISBN: 978-1-62708-319-5
.... , Removal of Low Molecular Weight Components in Thermal Debinding of MIM Components , Int. J. Powder Metall. , Vol 30 , 1994 , p 445 – 452 Selected References • Anwar M.Y. , Messer P.F. , Ellis B. , and Davies H.A. , Injection Moulding of 316L Stainless Steel Powder Using...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... environment of the test; and the molecular properties of the polymer. These factors are of considerable interest and practicality for the safe design of structural polymeric components subjected to repetitive loading. When designing for the fatigue life of an engineering plastic, one of two distinct...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030200
EISBN: 978-1-62708-282-2
... inhibitor concentrations. Therefore, inhibitors are specifically formulated to be nonemulsifying. Alternatively, emulsion-breaker chemicals are added to formulations in small amounts to prevent emulsions. Table 1 lists the cationic molecular structures found in many commercial inhibitors. These amines...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
... amorphous or partially crystalline, where crystallinity decreases with complexity of the pendant atom groups (steric hindrance), chain branching, as well as with increasing molecular weight. Qualitatively, strength and modulus are increased as crystallinity increases, while ductility is usually reduced. In...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290139
EISBN: 978-1-62708-319-5
... to migrate to the component surface. These are pendular bonds. In the saturated state, all voids are filled with binder. In the funicular state, open tubular pores exist that enable both liquid and vapor flow. Lower-molecular-weight species are most mobile, so there is preferential motion of those...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300047
EISBN: 978-1-62708-323-2
... go for over one thousand years before needing another wind . However, that is not perpetual motion and that is not zero friction. When one material slides or rolls on another, there are always interactions that produce loss of energy, even if they are at the atomic or molecular level. If any energy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780249
EISBN: 978-1-62708-281-5
... fatigue behavior is generally sensitive to temperature, frequency, and environment ( Ref 6 ), as well as molecular weight (MW), molecular weight density (MWD), and aging. S - N curves that do not account for these effects should not be used exclusively without looking at test conditions. Fig. 1...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540297
EISBN: 978-1-62708-309-6
... (macromolecules), consisting of a series of small repeating molecular units (monomers). Most common polymers have carbon (organic material) backbones, although polymers with inorganic backbones (e.g., silicates and silicones) are possible. Polymeric materials exhibit strong covalent bonds within each chain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780295
EISBN: 978-1-62708-281-5
... temperature ranges have been determined for a number of plastics. It is accepted that the aging range extends from the T g down to the highest secondary transition associated with small-scale molecular motion. Secondary transitions that are not well separated from the T g or that involve cooperative...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460067
EISBN: 978-1-62708-285-3
.... , Impact Behavior of Intrinsically Brittle Nanoparticles: A Molecular Dynamics Perspective , J. Therm. Spray Technol. , Vol 23 ( No. 3 ), 2014 , p 541 – 550 10.1007/s11666-013-0019-4 3.28 Dykhuizen R.C. , Smith M.F. , Gilmore D.L. , Neiser R.A. , Jiang X. , and...