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high-performance polymers

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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
..., such as high-performance polymers for implants, tissue engineering, and bioresorbable polymers. bioresorbable polymers failure analysis high-performance polymers implants medical applications medical devices medical polymer selection medical polymers polymerization product life cycle...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003023
EISBN: 978-1-62708-200-6
... identified in Fig. 1 . At temperatures below the T g of the given polymer, the polymer exhibits a high modulus, which decreases very slightly with increasing temperature until the vicinity of the glass transition is reached. This stage is referred to as the glassy plateau. As the polymer is heated...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003030
EISBN: 978-1-62708-200-6
... Representative friction and wear applications of polymers and composites Material (a) Seals Gears Compressor rings Pivot bearings Slideways Abrasive service Water immersion High- temperature service Unfilled thermoplastics PTFE X X X Acetal X X X Polyamide X X...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003026
EISBN: 978-1-62708-200-6
... primarily as thin films in capacitors and dielectric coatings; numerous polymer modifications exist Film coatings Phenoxies Tough, rigid, high-impact plastic; useful for electronic applications below about 80 °C (175 °F) Blow moldings, extrusions, injection moldings, film Polyallomers...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003029
EISBN: 978-1-62708-200-6
... small laboratory burners, hot surfaces, and high current or high voltage arcs. Simple “pass/fail” ignition tests provide fixed conditions of heat, oxygen, and time. The test specimen may or may not ignite within these conditions (see, for example, ASTM E 136, “Test Method for Behavior of Materials in a...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003025
EISBN: 978-1-62708-200-6
.... Ultimately, the sum of the entanglement and the intermolecular attractive forces becomes greater than the strength of the individual covalent bonds in the backbone of the polymer chain. This pertains to high-molecular-weight, cross-linked thermosets and low-molecular-weight thermoplastics. With...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003028
EISBN: 978-1-62708-200-6
... carbonyl groups or cross link. Oxidation can also occur when certain materials are exposed to ozone, which is a by-product of high-voltage partial discharge (corona). The presence of ozone, combined with oxygen, will affect polymers by attacking covalent bonds, such as those present in natural rubber...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003024
EISBN: 978-1-62708-200-6
... high-impact polystyrene (HIPS) and toughened polyvinyl chloride (PVC). Source: Ref 6 Fig. 4 Tensile stress-strain curve for high-impact polystyrene (HIPS) at 20 °C (68 °F). Source: Ref 6 The formation of crazes is sensitive to many variables, such as polymer molecular weight...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005667
EISBN: 978-1-62708-198-6
... the medical device arena. The additional properties of polymers, such as their high strength-to-weight ratio, radiopacity, and reduced modulus over traditionally used materials, have given medical device designers a new dimension and versatility that previously could not be obtained solely with metals...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003027
EISBN: 978-1-62708-200-6
... illuminated by helium-neon lasers, which operate at a wavelength of 0.633 μm (25 μin.). An irregularity of 0.0025 mm (0.0001 in.), then, is considered 4 wavelengths deep or high. Using this method, the irregularity of a surface can be deemed either better or worse, depending on the wavelength of light used...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006041
EISBN: 978-1-62708-172-6
... characteristic of FEVE polymers compared to pure fluoropolymers is their ability to achieve high gloss. The vinyl ether monomers not only provide solubility into solvents, but they also increase the refractive index of the polymer, which increases gloss. Coatings for factory and field application can be made...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003006
EISBN: 978-1-62708-200-6
...) resins. Epoxies are used as both commodity and engineering adhesives and as matrices for high-performance composites. Phenolic resins are used in commodity applications such as ashtrays and cutlery handles, as well as for brake pistons and electrical connectors. Unsaturated polyesters are most often used...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005659
EISBN: 978-1-62708-198-6
... special cases, the risk factor for a device may be high but acceptable when the device represents a unique way to preserve a patient's ability to maintain an acceptable lifestyle. Biocompatibility implies that the local or systemic response does not impair the device function or the health of the...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003848
EISBN: 978-1-62708-183-2
... homogeneously mixed to form a full compound. The full compound is shaped (molded, extruded, etc.) and heated. Chemistry of curing begins, and some polymer chains are connected by cross links creating the desired elastomeric properties. Often, with high-performance elastomers, the shaped item is postcured (at...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006077
EISBN: 978-1-62708-172-6
... curatives, resulting in highly resistant chemical coatings even at high temperatures (260 °C, or 500 °F). The use of bisphenol F resins cross linked with low-viscosity aliphatic, aromatic, and cycloaliphatic amines and low-weight polyamide co-polymers enables the formulation of low-volatile organic...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003063
EISBN: 978-1-62708-200-6
... Abstract Ceramic-matrix composites (CMCs) are being developed for a number of high-temperature and high-performance applications in industrial, aerospace, and energy conservation sectors. This article focuses on processing, fabrication, testing, and characterization methods of CMCs, namely...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003012
EISBN: 978-1-62708-200-6
... (HIPS). Impact modifiers are used extensively in high-performance polymers such as polycarbonate (PC), polyamides, polypropylene oxide (PPO), and polyacetals. Polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) also benefit from the addition of impact modifiers. The energy available...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006011
EISBN: 978-1-62708-172-6
... diisocyanate molecules together, yielding a cross linker with three reactive isocyanate groups. Polyols and polyisocyanates are employed in two-component polyurethane coatings to form high-performance, cross-linked films. Fig. 2 Aromatic and aliphatic diisocyanates used to synthesize higher-functional...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006044
EISBN: 978-1-62708-172-6
... properties of an acrylic polymer are dictated by the types and levels of monomers that are used in their manufacture. In some instances, homopolymers of a single acrylic monomer are prepared. Examples of homopolymers are poly(methyl methacrylate), a plastic with high transparency used as a substitute for...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003043
EISBN: 978-1-62708-200-6
... strength, the bond line thickness must be controlled so that repeatable joints with similar performance characteristics are achieved ( Ref 15 ). Although high stiffnesses and strengths can be attained for composite laminates, these characteristics are quite different from those of ordinary materials to...