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molecular composition

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780105
EISBN: 978-1-62708-281-5
... in characterizing thermoplastics, whether they are homogeneous resins, alloyed or blended compositions, or highly modified thermoplastic composites. The information herein is applicable to all these major resin groupings; no attempt has been made to contrast one against another. Molecular Weight Determination...
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 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030237
EISBN: 978-1-62708-349-2
.... The change in the molecular composition may extend only a few nanometers on the surface but can continue to progress into the bulk of the composite matrix. Composite materials having polymeric matrices are susceptible to degradation from heat, sunlight, ozone, atomic oxygen (in space), moisture, solvents...
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
... off the surface of the sample. Individual molecular bonds and bond groupings vibrate at characteristic frequencies and selectively absorb IR radiation at matching frequencies. The amount of radiation absorbed or passed through unchanged depends on the chemical composition of the sample...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140005
EISBN: 978-1-62708-264-8
... of salt dissolved in the water is given as a weight percent of the total liquid solution. Two terms are often used to describe the amount that has been dissolved. A 10 wt% sodium chloride value can be called the concentration of salt in the solution or the composition of the solution. Notice in Fig...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780359
EISBN: 978-1-62708-281-5
... mode Energy-dispersive x-ray spectroscopy (EDS) Elemental concentrations Material composition, fillers, additives Nuclear magnetic resonance (NMR) Molecular bond structure Material identification Mass spectroscopy (MS) Molecular structure Material identification, additives X-ray...
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
... of surfaces, determination of surface species Auger electron spectroscopy (AES) Elemental concentrations Chemical compositions of surfaces Wavelength dispersive x-ray analysis Elements present on polymer surfaces Identification of contaminants on polymer surfaces Problem Solving Molecular...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780249
EISBN: 978-1-62708-281-5
.... The rate of FCP is correlated with experimental conditions, such as applied stress, temperature, and frequency, and material parameters, such as molecular composition or microstructure. The equation proposed by Paris and Erdogan ( Ref 38 ) has gained the widest acceptance. It states: (Eq 4) da...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780115
EISBN: 978-1-62708-281-5
... block copolymers; SB-BL, styrene-butadiene block copolymers; H-SB-BL, hydrogenated SB-BL; POBT-PBT, poly(polyoxybutylene terephthalate) and polybutylene terephthalate; POB-N, polyoxybutylene glycol and nylon 12. (a) High hardness grade. (b) Amorphous polymer, T g varies with composition...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780003
EISBN: 978-1-62708-281-5
... Branching Stereoisomers Molecular Weight and Distribution Polymer Structure Geometric Isomers Flexibility and Bulkiness of the Mer Hydrogen Bonds Crystallinity Chemical Composition and Structure Cross Linking Hydrocarbon Polymers Secondary Bonds Structure between Polymer...
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
... 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 semicrystalline polymers, the mobility of polymer segments...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780089
EISBN: 978-1-62708-281-5
...Abstract Abstract This article focuses on characterization techniques used for analyzing the physical behavior and chemical composition of thermoset resins, namely chromatography and infrared spectroscopy. The main purpose is to give sufficient detail to permit the reader understand...
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
.... , Sun Y.N. , and Williams J.W. , Pyrolysis of Poly(Vinyl Butyral) Binders, Part I: Degradation Mechanisms , Ceram. Trans. , Vol 1 ( Part A ), 1988 , p 549 – 558 8. Angermann H.H. and Van Der Biest O. , Removal of Low Molecular Weight Components in Thermal Debinding of MIM...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030177
EISBN: 978-1-62708-349-2
... thermoset-matrix composites commonly ranges from 0.5 to 10 μm. The size and degree of phase separation is a complex function of the formulation constituents, rubber or thermoplastic characteristics (such as solubility, molecular weight, and functionalization), and cure cycle. It is well known that phase...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... propagation Increasing da / dN with increasing mean stress Decreasing da / dN with increasing mean stress High-density polyethylene Nylon High-molecular-weight PMMA Polystyrene Epoxy Polyethylene copolymer Low-density polyethylene Polyvinyl chloride Low-molecular...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780267
EISBN: 978-1-62708-281-5
.... and Feast J. , Ed., John Wiley & Sons , 1978 3. Pooley C.M. and Tabor D. , Friction and Molecular Structure: The Behaviour of Some Thermoplastics , Proc. R. Soc. (London) A , Vol 329 , 1972 , p 251 – 274 10.1098/rspa.1972.0112 4. Steijn R.P. , The Sliding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870031
EISBN: 978-1-62708-314-0
... often used in high-performance composites. Source: Ref 1 Fig. 2.8 Conventional polymer and liquid crystal–like aramid polymers. Source: Ref 3 Fig. 2.9 Aramid fiber failure modes. Source: Ref 3 Fig. 2.10 Macromolecular orientation of ultra-high molecular weight (UHMWPE...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780146
EISBN: 978-1-62708-281-5
... into the polymer. These chemical alterations of the molecular structure are not necessarily irreversible, as the effects can be reversed if the chemical is removed from the material (for example, by evaporation). Environmental stress cracking also can occur without significant absorption of an environmental...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870401
EISBN: 978-1-62708-314-0
... for composites except ultrahigh molecular weight polyethylene are relatively nonflammable; however, at high temperatures they soften, char, or melt, and their mechanical strength is reduced. Composite laminates tend to burn in layers. When heated, the resin in the first layer degrades, and any combustible...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780314
EISBN: 978-1-62708-281-5
...; and moisture-induced fatigue failure in composites. The effect of moisture on the mechanical properties of thermoset resins and thermoplastics are also discussed. moisture-induced damage mechanical properties thermoset resins thermoplastics composites ONE ASPECT of plastics corrosion resistance...