Rheological properties of poly‐α‐olefin melts

Shirayama, Kenzo; Matsuda, Tadashi; Kita, Shin-ichiro

doi:10.1002/macp.1971.021470114

Cited by 10 publications

(4 citation statements)

References 28 publications

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“…The steady shear viscosity and the first normal stress difference N1 were determined as a function of shear rate, and the steady-state shear modulus G; was calculated by (1) where u is the shear stress and J, is the steady-state shear compliance as a function of shear. The dynamic shear storage modulus G' and the dynamic shear loss modulus G" were measured as functions of frequency by oscillatory experiments.…”

Section: Methodsmentioning

confidence: 99%

“…Relaxation time ratios for the poly(1-olefins). (0) Calculated from Poly(1-tridecene) 1.27 x 6.10 x 10-9…”

Section: Newtonian Viscositymentioning

confidence: 99%

“…Poly(1-octadecene) 1.46 x 10-l8 2.13 X 10-lo side-chain length is essentially linear. This is consistent with results of Shirayama et a1.l Shirayama et al studied the molecular weight dependence of viscoelastic properties of poly ( 1-olefins).…”

Section: Newtonian Viscositymentioning

confidence: 99%

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Steady‐state and dynamic rheology of poly(1‐olefin) melts

Wang

Knox²,

Porter

1978

J. Polym. Sci. Polym. Phys. Ed.

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SynopsisThe steady-state and dynamic melt rheology for a series of poly( 1-olefins) has been investigated. The series includes poly(1-butene), poly(1-hexene), poly(1-heptene), poly(1-octene), poly(1-undecene), poly(1-tridecene), poly(1-hexadecene), and poly(1-octadecene). The flow behavior was investigated by use of a Weissenberg rheogoniometer. Measurements on poly(1-butene) were also made using an Instron capillary rheometer. The empirical relationship developed by Cox and Merz was obeyed for the entire series of poly( 1-olefins) a t all temperatures investigated. Graessley's theory was used to calculate the flow curves for the poly(1-olefins) from the measured molecular weight distributions. The purpose was to investigate the effect of polymer composition on the shear rate dependence of viscosity. It was found that all experimental flow curves except those for poly(1hexene) can be fitted with the calculated curves from the individual molecular weight distributions. The conclusion is made that flow curves of poly(1-olefins) depend predominately on molecular weight distribution and are essentially independent of side-chain length even for poly(1-olefins) with pendant groups as long as 16 carbon atoms. The low-shear limiting Newtonian viscosity 70 for all poly(1olefins) was expressed by, 70 = KMw3 or by qo = K'pw3 4, where aw is the weight-average molecular weight and pu is the weight-average degree of polymerization. The K and K' values obtained decrease systematically as the side chain is increased.

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Section: Methodsmentioning

confidence: 99%

“…Relaxation time ratios for the poly(1-olefins). (0) Calculated from Poly(1-tridecene) 1.27 x 6.10 x 10-9…”

Section: Newtonian Viscositymentioning

confidence: 99%

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Steady‐state and dynamic rheology of poly(1‐olefin) melts

Wang

Knox²,

Porter

1978

J. Polym. Sci. Polym. Phys. Ed.

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“…Mark and Flory have published the unperturbed dimension of poly(l-butene) and poly(l-pentene). 20 For higher poly(l-olefin)s, Shirayama, etal., 21 have given the unperturbed dimension of poly(l-octene) and poly(l-octadecene). For other higher members, no information on chain dimensions has been reported so far.…”

Section: Peratures I Solutions I Crystallinity I Solubility Imentioning

confidence: 99%

Physical Properties of the Poly(1-olefin)s. Thermal Behavior and Dilute Solution Properties.

Wang

Porter²,

Knox³

1978

Polym J

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Poly(l-olefin)s from poly(l-butene) up to poly(1-octadecene) have been characterized. The melting point was measured by Differential Scanning Calorimetry (DSC-1B) and dilatometry, the specific volume and volume expansion coefficient by dilatometry, and the unperturbed chain dimension by intrinsic viscosity at near theta conditions. A trend is confirmed for melting points and revealed for expansion coefficients of first a decrease with increasing side-chain length in the polyolefins, followed by an increase with further increase in length. The minimum is near poly(1-hexene) and poly(1-heptene). The specific volume of the polytl-olefin) series exhibits a maximum around this same composition. The minima in melting point and thermal expansion coefficient and the maximum in specific volume are discussed in terms of chain-to-chain packing density. It is suggested that packing density is a minimum in this region. Two melting points were found for each of several higher poly(lolefin)s from poly(1-tridecene) up to poly(l-octadecene). It is found that the theta temperatures of the poly(l-olefin) series, as measured in two solvents, anisole and cyclohexanone, exhibit a minimum at poly(l-pentene). However, the characteristic ratios and the steric factors increase with increasing side-chain length for the entire series of measured poly(1olefin)s.

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Fractionation of Polymers

Barrales‐Rienda

Bello

et al. 1999

The Wiley Database of Polymer Properties

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Rheological properties of poly‐α‐olefin melts

Cited by 10 publications

References 28 publications

Steady‐state and dynamic rheology of poly(1‐olefin) melts

Steady‐state and dynamic rheology of poly(1‐olefin) melts

Physical Properties of the Poly(1-olefin)s. Thermal Behavior and Dilute Solution Properties.

Fractionation of Polymers

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