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homogeneous polymers

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Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
... material. Source: Ref 5 Fig. 4 Creep of polymethyl methacrylate under a torsional stress at 30 °C (85 °F). Source: Ref 12 Abstract This article describes the general aspects of creep, stress relaxation, and yielding for homogeneous polymers. It then presents creep failure mechanisms...
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
... to thermomechanical testing; 5 °C/min (9 °F/min) in flexure. HDPE, high-density polyethylene; LDPE, low-density polyethylene; PC, polycarbonate; PVC, polyvinyl chloride. Abstract This article addresses some established protocols for characterizing thermoplastics and whether they are homogeneous resins...
Image
Published: 15 May 2022
Fig. 4 Schematic stress-strain curves for a typical thermoplastic polymer tested at four temperatures and constant strain-rate; (1) low temperature and brittle behavior, (2) intermediate temperature with some ductility, (3) greater temperature (approaching glass transition temperature More
Series: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006904
EISBN: 978-1-62708-392-8
... theoretically address this need, in practice nearly all bioinks require additional covalent crosslinking to achieve sufficient mechanical resilience. Covalent crosslinking of relatively homogeneous polymer networks generally results in randomly crosslinked networks with heterogeneity in the crosslink density...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003013
EISBN: 978-1-62708-200-6
... of various plastics and is often contaminated. Secondary recycling can be further categorized into: Processing that produces a homogeneous material that has properties approximating those of virgin polymers. The first type of products can be substituted for virgin plastics in some applications. Melt...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003401
EISBN: 978-1-62708-195-5
... Abstract This article explains the key features of the manufacturing techniques for polymer composites. It describes the selection of a technically and economically feasible manufacturing technique for a composite design. The article discusses widely accepted and emerging techniques...
Series: ASM Handbook
Volume: 23A
Publisher: ASM International
Published: 12 September 2022
DOI: 10.31399/asm.hb.v23A.a0006883
EISBN: 978-1-62708-392-8
.... The energy input is homogeneous due to planar irradiation, which provides a desirable surface finish for the components. Polymer Powder 3D Printing Processes Using Fusing Agents and Energy Multijet Fusion Multijet fusion is a new powder-based AM process that produces high-resolution and better...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003711
EISBN: 978-1-62708-182-5
... and gives examples of commercial materials. In general, metals are versatile materials that can be modified easily to achieve specific properties. Polymers can be produced readily in complex near-net final shape, and they have high ductility and low strength. Ceramics tend to have high compressive strength...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009085
EISBN: 978-1-62708-177-1
... Abstract Lightning damage in polymer composites is manifested by damage at both the macroscopic or visual level and within the material microstructure. This article illustrates the effects of the laboratory-generated lightning strikes on polymeric composites. laboratory-generated...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001763
EISBN: 978-1-62708-178-8
... Abstract This article presents the experimental and theoretical aspects of small-angle scattering, and discusses specific applications used in the characterization of metals, glasses, polymers, and ceramics. The basic methods of collimating x-rays, the cause of smearing from a line source...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006578
EISBN: 978-1-62708-290-7
... removing the polymer ( Fig. 4b ) ( Ref 3 ). To control the slurry homogeneity, one must understand the slurry-preparation mechanism. The slurry is a mixture of ceramic particles and photocurable resin. These micro- or nanoscale ceramic particles inside the slurry are extremely easy to aggregate due to van...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003379
EISBN: 978-1-62708-195-5
..., to characterize them in the model at the highest level that does not lose the minimum level of physical definition that is needed. There is a conscious rejection of the common hypothesis that fiber-polymer composites need not be modeled with any greater precision than for a homogenized lamina that does not even...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006944
EISBN: 978-1-62708-395-9
..., and the ductility increases when material is close to T g . Finally, at even greater temperatures, homogeneous deformation is observed with a very large extension at fracture. In an amorphous polymer above the T g , the rubber-like behavior occurs at very low stress levels. Viscous flow (or viscoelastic behavior...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005745
EISBN: 978-1-62708-171-9
... Abstract This article reviews the use of thermal spray polymer coatings as a replacement for paints. It discusses the applications of the thermal spray forming process. The article also provides information on the applications of thermal spray in metal processing, textile and plastics...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006865
EISBN: 978-1-62708-395-9
... coincidentally occurs at about the same strain as yielding in a ductile polymer. Except for a slight decrease in slope immediately before fracture, the deformation may be considered linearly elastic. Hooke’s law for a homogeneous, isotropic material can be applied for most practical engineering analyses...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003541
EISBN: 978-1-62708-180-1
... immediately before fracture, the deformation may be considered linearly elastic. Hooke's law for a homogeneous, isotropic material can be applied for most practical engineering analyses of stress and strain in a brittle plastic part. When a ductile polymer fractures in a brittle manner, the stress...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003267
EISBN: 978-1-62708-176-4
... Abstract This article provides a discussion on the mechanical properties of metals, ceramics, and polymers and fiber-reinforced polymer composites at low temperatures. It reviews the factors to be considered in tensile and compression testing of these materials. The article details...
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
... acrylic latex with a homogeneous morphology is closely related to the polymer T g and can be further lowered by use of coalescents. So, if the formulator does not use enough coalescent to depress the MFFT for the intended application conditions, or if the applicator applies at too low a temperature...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006915
EISBN: 978-1-62708-395-9
... Softening temperature Character of polymer at 25 °C (77 °F) °C °F 1 30 –169 (a) –272 (a) Gas 6 170 –12 (a) 10 (a) Liquid 35 1,000 37 99 Grease 140 4,000 93 199 Wax 250 7,000 98 208 Hard wax 430 12,000 104 219 Plastic 750 21,000 110 230 Plastic...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006916
EISBN: 978-1-62708-395-9
... until a complete breakdown of the polymer occurs. Overheating can also consume or deplete important additives such as antioxidants, which can weaken the polymer. Conversely, a melt that is too cold will not allow the material to fuse properly or to create a homogenized mix. Crystalline materials have...