1-20 of 141 Search Results for

polymer structure

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
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
... crystal phases and structures in solid materials. failure analysis infrared spectroscopy nuclear magnetic resonance spectroscopy polymer structure thermal analysis X-ray diffraction FAILURE OF POLYMERIC materials is the result of a very complex process. This article introduces procedures...
Image
Published: 15 May 2022
Fig. 8 Polymer structure. The spheres represent the repeating units of the polymer chain, not individual atoms. Source: Ref 8 More
Image
Published: 15 May 2022
Fig. 13 Mer chemical structure of representative hydrocarbon thermoplastic polymers. (See Table 6 for glass transition temperatures.) More
Image
Published: 15 May 2022
Fig. 15 Mer chemical structure of representative heterochain thermoplastic polymers More
Image
Published: 15 May 2022
Fig. 17 Mer chemical structure of representative thermoplastic polymers for high-temperature service More
Image
Published: 15 May 2022
Fig. 1 Structures of selected commodity and engineering plastics. Polymer chains are made up of the repeat units shown, joined end to end. Source: Ref 2 – 7 More
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006925
EISBN: 978-1-62708-395-9
... Abstract This introductory article describes the various aspects of chemical structure that are important to an understanding of polymer properties and thus their eventual effect on the end-use performance of engineering plastics. The polymers covered include hydrocarbon polymers, carbon-chain...
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
..., and addresses related considerations such as melt viscosity and melt strength, crystallization, orientation, die swell, melt fracture, shrinkage, molded-in stress, and polymer degradation. composition elastic modulus engineering plastics polymer properties polymer structure shear rate...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006917
EISBN: 978-1-62708-395-9
... regions. Crystalline regions result from greater intermolecular forces that lead to tightly knit and organized structures called lamellae ( Fig. 2 ) ( Ref 3 ). These lamellar structures are comprised of polymer molecules that have created organized folding patterns upon cooling. As the polymeric molecules...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006923
EISBN: 978-1-62708-395-9
... fraction become brittle at temperatures below the T g . During crystallization, the crystallizing polymer has chain segments containing structural irregularities, for example, short-chain and long-chain branches on PE chains. These structural irregularities are routed into the regions of amorphous...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... magnification are then described. Typical microscopic features observed on structural metals are presented subsequently, followed by a brief discussion on fatigue in polymers and polymer-matrix composites. engineering components fatigue fracture fractography metals polymer-matrix composites polymers...
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
... crazing and fracture in polymeric materials, with a review of the behavior of the elastic modulus as a function of temperature or time parameters, emphasizing the importance of the viscoelastic nature of their deformation and fracture. The discussion covers the behavior of polymers under stress, provides...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006940
EISBN: 978-1-62708-395-9
... mechanical fatigue failure polymers thermal fatigue failure FAILURE OF STRUCTURAL polymeric materials under cyclic application of stress or strain is not only a subject of technical interest but one of industrial importance as well. Fracture of components is usually due to initiation and growth...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006866
EISBN: 978-1-62708-395-9
... of the enzymatics involved in the degradation of most synthetic polymers in nature. Notably, for each polymer, multiple studies have shown that microbial colonization has an impact on the surfaces and structures of the polymers; however, the majority of the studies failed to identify active enzymes acting...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006918
EISBN: 978-1-62708-395-9
... performance of polymers. crack-tip process fatigue crack growth fatigue fracture fatigue life analysis plastics toughening FATIGUE is of critical concern when designing polymeric components for structural applications. Like all engineering materials, fatigue failure often ensues in the polymer...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003550
EISBN: 978-1-62708-180-1
... Abstract The article commences with an overview of short-term and long-term mechanical properties of polymeric materials. It discusses plasticization, solvation, and swelling in rubber products. The article further describes environmental stress cracking and degradation of polymers...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001798
EISBN: 978-1-62708-241-9
... is given in ( Fig. 1 ) [ 4 ]. It is known that the curing conditions, including temperature, time, usage of curing agent, etc., can affect the structure of the resulting polymer. Fig. 1 Curing mechanism of epoxy resin with anhydride as curing agent It is well known that normally cured resins...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006932
EISBN: 978-1-62708-395-9
... thickness. Source: Ref 4 Thermal Mismatch In composite structures, thermal stresses arise both from inhomogeneous cooling and as a result of a thermal mismatch due to differences in CTEs between the filler and matrix polymer. Ideally, in terms of processing, one should attempt to minimize...
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
... Abstract This article reviews the mechanical behavior and fracture characteristics that discriminate structural polymers from metals. It provides information on deformation, fracture, and crack propagation as well as the fractography involving the examination and interpretation of fracture...
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
... packing density. Molecular-scale voids, known collectively as free volume, exist within the polymeric macromolecular structure. Applied stress serves to straighten the polymer chains and perhaps to redistribute the free volume so that sizable microvoids are formed. Depending on the nature of the polymer...