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molecular weight distribution

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780359
EISBN: 978-1-62708-281-5
... modulus, tan delta Temperature-dependent behavior, aging/degradation, solid-liquid interactions Gel permeation chromatography (GPC) Weight-average molecular weight, molecular weight distribution Degradation, suitability of material for use Melt flow rate (MFR) Melt viscosity Degradation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780105
EISBN: 978-1-62708-281-5
... of molecular weight (MW) by viscosity measurements. This is followed by a discussion of the use of cone and plate and parallel plate geometries in determining the viscoelastic properties of a polymer melt. Details on some of the chromatographic techniques that allow determination of MW and MW distribution...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780343
EISBN: 978-1-62708-281-5
... approach pertinent to structure analysis. This is followed by a review of the characterization of plastics by infrared and nuclear magnetic resonance spectroscopy. The article then provides information on the distribution of molecular weight of an engineering plastic. It further discusses the methods used...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780003
EISBN: 978-1-62708-281-5
... on resin properties Properties Density Molecular weight Molecular-weight distribution Environmental stress cracking resistance Decreases Increases Broadens Impact strength Decreases Increases Narrows Stiffness Increases … … Hardness Increases … … Tensile strength...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.9781627082815
EISBN: 978-1-62708-281-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780305
EISBN: 978-1-62708-281-5
.... and Biesenberger J. , Molecular Weight Distribution and Environmental Stress Cracking of Linear Polyethylene , Polym. Eng. Sci. , Vol 6 , 1966 , p 341 10.1002/pen.760060410 36. Hannon M.J. , Microscopic Aspects of Brittle Failure of Polyethylene Below the Yield Stress , J. Appl. Polym. Sci...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780089
EISBN: 978-1-62708-281-5
... Using NMR and GPC Techniques , J. Appl. Polym. Sci. , Vol 16 , 1972 , p 1953 – 1958 10.1002/app.1972.070160809 23. Batzer H. , and Zahir S.A. , Studies in the Molecular Weight Distribution of Epoxide Resins. II . Chain Branching in Epoxide Resins, J. Appl. Polym. Sci. , Vol 19...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
... of the polyethylene ( Ref 11 ) and depends primarily on the yield point. However, the susceptibility to the brittle fracture mode is strongly influenced by molecular weight, molecular weight distribution, and the degree and type of branching in the molecule. An increase in the molecular weight produces an increase...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780028
EISBN: 978-1-62708-281-5
... or three turns (flights). Molecular weight distribution also factors into the extrusion of relatively low-viscosity polymers such as PEs. A wider MWD provides easier processing, but is detrimental to final properties such as strength and heat sealing. Narrower MWDs, particularly with linear polymers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780238
EISBN: 978-1-62708-281-5
... composites ( Ref 19 ). In summary, extrinsic shielding mechanisms can be used to improve resistance to fatigue crack propagation in engineering polymers. Polymers are sensitive to a number of molecular variables, including molecular weight, molecular weight distribution, crystallinity, chain entanglement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780115
EISBN: 978-1-62708-281-5
... °C/min (18 °F/min); N 2 flow = 50 cm 3 /min (3 in. 3 /min) in DSC, TGA, and TMA; weight = 14–21 mg (0.21–0.32 gr) in DSC and 27–36 mg (0.42–0.55 gr) in TGA; in TMA, 5.0 g (0.18 oz) applied load, and height = 1.3–1.7 mm (0.05–0.07 in.) Effect of water on the <italic>T</italic><sub>g</sub>...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550325
EISBN: 978-1-62708-307-2
... viscosity and processing temperature. Fundamentally, they function by broadening the molecular weight distribution and increasing the low-molecular-weight fraction of the total composition. Plasticizers are essentially nonvolatile solvents. In semicrystalline polymers, the mobility of polymer segments...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780336
EISBN: 978-1-62708-281-5
.... Feng S. and Sen P.N. , Percolation on Elastic Networks: New Exponent and Threshold , Phys. Rev. Lett. , Vol 52 ( No. 5 ), 1984 , p 216 10.1103/PhysRevLett.52.216 Plastics remain relatively immune to microbial attack as long as their molecular weight remains high. A review...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870063
EISBN: 978-1-62708-314-0
... ). The first is to alter the main monomer backbone chain by increasing the molecular weight between crosslinks with long-chain monomers. The resulting decrease in glass transition temperature can be somewhat offset by constructing a long-chain monomer with rigid bulky side groups, such as benzene rings...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030177
EISBN: 978-1-62708-349-2
... thermoset-matrix composites commonly ranges from 0.5 to 10 μm. The size and degree of phase separation is a complex function of the formulation constituents, rubber or thermoplastic characteristics (such as solubility, molecular weight, and functionalization), and cure cycle. It is well known that phase...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290035
EISBN: 978-1-62708-319-5
.... , Sun Y.N. , and Williams J.W. , Pyrolysis of Poly(Vinyl Butyral) Binders, Part I: Degradation Mechanisms , Ceram. Trans. , Vol 1 ( Part A ), 1988 , p 549 – 558 8. Angermann H.H. and Van Der Biest O. , Removal of Low Molecular Weight Components in Thermal Debinding of MIM...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... propagation Increasing da / dN with increasing mean stress Decreasing da / dN with increasing mean stress High-density polyethylene Nylon High-molecular-weight PMMA Polystyrene Epoxy Polyethylene copolymer Low-density polyethylene Polyvinyl chloride Low-molecular...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
... on the molecular weight of the polymer. Because the fibrils are load-bearing, the microcrack usually does not open substantially before parallel microcracks form. Fiber-forming plastics such as nylon, polyethylene (PE), and polypropylene (PP) readily stress craze, but crazing also occurs in non-fiber-forming...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290139
EISBN: 978-1-62708-319-5
... exist that enable both liquid and vapor flow. Lower-molecular-weight species are most mobile, so there is preferential motion of those species within the pores. As binder removal continues, pendular bonds emerge. These are the binder bridges between particles. Because the binder is isolated...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780329
EISBN: 978-1-62708-281-5
..., and physical stresses all combine to produce changes in the chemical composition of the material. These changes may take the form of polymer molecular weight reduction due to main-chain cleavage, the formation of cross links, or the formation of oxidized and other functional groups. As the chemical composition...