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molecular weight

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Published: 15 May 2022
Fig. 7 Influence of molecular weight and temperature on the physical state of polymers. (a) Amorphous polymer. (b) Crystalline polymer. Source: Ref 7 More
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Published: 15 May 2022
Fig. 2 Viscosity (η) dependence on molecular weight average ( M w ) exhibiting critical molecular weight ( M c ). Source: Ref 16 More
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Published: 15 May 2022
Fig. 14 Typical molecular weight distribution curve. M ¯ n , number-average molecular weight; M ¯ v ⁠, viscosity average molecular weight; M ¯ w ⁠, weight-average molecular weight; M ¯ z , Z-average molecular weight. Source: Ref 14 More
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Published: 15 May 2022
Fig. 23 Polyolefin melting profiles. MW, molecular weight. Source: Ref 25 More
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Published: 15 May 2022
Fig. 9 Polyolefin melting profiles. MW, molecular weight. Source: Ref 53 More
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Published: 15 May 2022
Fig. 4 Torque rheometry as a function of molecular weight More
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Published: 15 May 2022
Fig. 7 Relationship of molecular weight to zero-shear viscosity More
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Published: 15 May 2022
Fig. 12 Sensitivity of solution versus melt rheometry to molecular weight More
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Published: 15 May 2022
Fig. 13 Narrow versus broad molecular weight distribution More
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Published: 15 May 2022
Fig. 10 Creep curve for high molecular weight polyethylene (HMWPE) More
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Published: 15 May 2022
Fig. 11 Stress relaxation curve for high molecular weight polyethylene (HMWPE) More
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Published: 15 May 2022
Fig. 23 SEM fractographs of ultrahigh-molecular-weight polyethylene, showing the fracture surface of a specimen fracture in slow bending at ambient temperature. The direction of crack propagation is from left to right. (a) At low magnification showing layered fracture with mixture of coarse More
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Published: 15 May 2022
Fig. 24 SEM fractographs of ultrahigh-molecular-weight polyethylene, showing the fracture surface of a specimen fracture under impact testing at ambient temperature. The direction of crack propagation is from left to right. (a) Flat fracture. Original magnification: 250×. (b) Flat fracture More
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Published: 15 May 2022
Fig. 26 SEM fractographs of fatigue fracture surface of ultrahigh-molecular-weight polyethylene, using compact-tension specimens in the Paris regime. Direction of crack growth indicated by the white arrows. (a) Sterilized specimen tested at ambient temperatures. Original magnification: 1000 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090442
EISBN: 978-1-62708-218-1
... degradation of the failed part material, and the thermograms supported this. The conclusion was that the failed sleeves had cracked due to embrittlement associated with severe degradation and the corresponding molecular weight reduction. The reduction in molecular weight significantly reduced the mechanical...
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
.... The descriptions of the analytical techniques are supplemented by a series of case studies that include pertinent visual examination results and the corresponding images that aid in the characterization of the failures. The article describes the methods used for determining the molecular weight of a plastic resin...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090448
EISBN: 978-1-62708-222-8
... had been degraded, producing a reduction in the molecular weight and reducing both the mechanical integrity and chemical-resistance properties of the parts. Crystallization Electrical appliances Grease Housings Injection molding Molding resins Undercrystallization Polycarbonate...
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
... properties of polymer. This is followed by a section describing molecular weight determination using viscosity measurements. Next, the article discusses the use of cone and plate and parallel plate geometries in melt rheology. It then reviews the processes involved in the analysis of thermoplastic resins...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006867
EISBN: 978-1-62708-395-9
... reagent. Finally, there are some chemicals that cause actual degradation of the polymer, breaking the macromolecular chains, reducing molecular weight, and diminishing polymer properties as a result. This article examines each of these effects. The discussion also covers the effects of surface...
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
... engineering polymers. The article describes fracture mechanics solutions and approaches to the fatigue characterization of engineering polymers when dealing with macroscale fatigue crack growth. It includes mechanistic images for high-density polyethylene, ultrahigh-molecular-weight polyethylene, nylon 6, 6...