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molecular composition

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Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006651
EISBN: 978-1-62708-213-6
... and the time-of-flight mass spectrometer. Inductively coupled plasma and thermal ionization MS provide atomic information, and direct analysis in real-time and matrix-assisted laser-desorption ionization MS are used to analyze molecular compositions. The article describes various factors pertinent...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006675
EISBN: 978-1-62708-213-6
..., and manipulating surfaces at atomic or nanometer scale Secondary ion mass spectroscopy (SIMS) Ion beam Secondary ions Elemental, isotopic, or molecular composition of the surface through detection of the species with different mass-to-charge ratios 50 nm–10 μm 0.5–10 nm Concentration depth profiling...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006933
EISBN: 978-1-62708-395-9
... analyses are performed on metal and plastic materials center primarily on the techniques used to evaluate the composition and structure of the material. Unlike metals, polymers have a molecular structure that includes characteristics such as polymer functional groups, molecular weight, molecular weight...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009084
EISBN: 978-1-62708-177-1
... of degradation. One of the first indicators of degradation is the change in the surface appearance or gloss, followed by a change in the color of the surface resin. 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...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003432
EISBN: 978-1-62708-195-5
... typical resin and prepreg property tests. quality control epoxy resins curing agent component material test mixed resin system test prepreg test high-performance liquid chromatography infrared spectroscopy gel permeation chromatography MOST RESINS USED IN COMPOSITE MATERIALS are blends...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001278
EISBN: 978-1-62708-170-2
... and weathering resistance. Chang et al. ( Ref 29 ) have described high-solids coating compositions that do not need higher-molecular-weight polyurethanes to achieve adequate flexibility. The polyol of this invention is characterized as above, by its content of cyclic moieties necessary for good hardness...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005676
EISBN: 978-1-62708-198-6
... with the base polymer to prolong the life of the material and improve its physical, chemical, and aesthetic properties. The properties of common synthetic medical polymers vary widely and are governed by their chemical composition, molecular weight, molecular architecture, and morphology. More detailed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003525
EISBN: 978-1-62708-180-1
... center on the techniques used to evaluate the composition and structure of the material. Unlike metals, polymers have a molecular structure that includes characteristics such as molecular weight, crystallinity, and orientation, and this has a significant impact on the properties of the molded article...
Image
Published: 01 December 2004
Fig. 2 Micrograph of a carbon fiber composite material that was toughened using two rubber materials of different molecular weight. Two different phase morphologies are observed, corresponding to the different tougheners. Ultrathin section. Transmitted light, Hoffman modulation contrast, 40 More
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001738
EISBN: 978-1-62708-178-8
.... That is, the composition of the gas in the introduction system changes with time as the gas flows through the leak. In noncomputerized gas mass spectrometry, an assumption used to deal with fractionation is that there is a canceling effect because the admission rate of gas molecules of molecular weight M in molecular...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003365
EISBN: 978-1-62708-195-5
... ) and having a calculated molecular weight of 5000 g/mol, has been extensively characterized as an adhesive ( Ref 13 , 14 , 91 , 92 , and 93 ) and as a composite-matrix resin ( Ref 13 , 14 , 94 , 95 , and 96 ). This material offered the best combination of properties of the oligomers investigated...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006931
EISBN: 978-1-62708-395-9
... of crystallinity, molecular orientation, cross linking, phase separation, structural or morphological changes resulting from processing, and chemical composition in polymer blends, graft polymers, and copolymers.” Polymer composites have also been studied by DMA. The tan δ spectra of impact-modified PP related...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005685
EISBN: 978-1-62708-198-6
...-linking in polymers Modes of Operation Mass Spectrum Secondary ion mass spectrometry analysis identifies the elemental and molecular composition of the uppermost 10 to 20 Å of the analyzed surface from positive and negative mass spectra. A high-resolution TOF analyzer can distinguish species...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006849
EISBN: 978-1-62708-395-9
... Abstract This article addresses some established protocols for characterizing thermoplastics and whether they are homogeneous resins, alloyed, or blended compositions or highly modified thermoplastic composites. It begins with a discussion on characterizing mechanical, rheological, and thermal...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003844
EISBN: 978-1-62708-183-2
... coatings coating degradation permeation molecular composition PAINTS AND PROTECTIVE COATINGS are by far the most common means of protecting materials from deterioration. Besides protection, coatings add color, beautify, provide light reflectivity, camouflage, reflect heat, absorb heat, and provide...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005544
EISBN: 978-1-62708-197-9
... Facility of the Department of Chemistry at the University of Pennsylvania. It offers molecular modeling, simulation, mathematical software packages, and the Cambridge Structural Database. University of Pennsylvania http://help.chem.upenn.edu/ CASTEP CASTEP is a software package that uses density...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003441
EISBN: 978-1-62708-195-5
... or neat resin systems are mostly blended with ingredients that are added to impart a desired property to the prepreg and/or cured composite. Proper formulation of resin compounds requires knowledge of the molecular structure of the resins as well as their chemical/ physical properties and curing reactions...
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