Correlations between chain parameters and the plateau modulus of polymers

Aharoni, Shaul M.

doi:10.1021/ma00156a033

Cited by 116 publications

(81 citation statements)

References 6 publications

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“…Wu's model predictions for zero-shear viscosity was found to correctly predict data for various systems, 5,9 but was found unsuitable in other cases. 10,11 In the present work, a different blending rule for 0 was therefore used.…”

Section: Introductionmentioning

confidence: 77%

“…By using the above relation, P in a PVPh/PEO blend is deduced from the values of G N 0 , and chain dimensions ͗R 2 ͘/M w can be estimated by eq. (9).…”

Section: Determination Of Globalmentioning

confidence: 95%

“…For a blend, C ϱ can be obtained from interpolation by using the relationship C ϱ ϰ N e 0.5 , where N e is the number of repeat units in an entanglement strand. Although Aharoni's chain stiffness parameters and M e 's of a large number of polymers support this relationship, 9 it was shown later by Fetters et al 12 that the relation C ϱ ϰ N e 0.5 is imprecise because N e increases with temperature while C ϱ can either remain constant, decrease, or increase. Various polymer entanglement models were reviewed by Heymans,13 who demonstrated that the Fetters 12 and the ColbyRubinstern 14 models are applicable.…”

Section: Introductionmentioning

confidence: 92%

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Rheological quantification of molecular parameters: Application to a hydrogen bond forming blend

Cai

Aı̈t-Kadi

Brisson

2004

J of Applied Polymer Sci

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ABSTRACT:The component dynamics and molecular parameters were investigated for miscible poly(4-vinyl phenol)/poly(ethylene oxide) (PVPh/PEO) blends. Global values of molecular weight between entanglements (M e ) were first estimated for the blends and were compared with existing athermal model predictions. Global interchain friction coefficients () of the blends were deduced from the zeroshear viscosity. A maximum was observed at a composition of 20 -30 wt % of PEO. Chain dimensions of this phase are estimated by using a relationship between the plateau modulus and a packing length (i.e., number of individual chains present in a given small volume of the melt). A slight increase in M e is observed at low PEO weight fraction (before 0.20), followed by a sharp decrease in M e values after this concentration. Values of in PVPh/PEO blends show a maximum value at 20 -30 wt % of PEO.

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Section: Introductionmentioning

confidence: 77%

“…By using the above relation, P in a PVPh/PEO blend is deduced from the values of G N 0 , and chain dimensions ͗R 2 ͘/M w can be estimated by eq. (9).…”

Section: Determination Of Globalmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 92%

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Rheological quantification of molecular parameters: Application to a hydrogen bond forming blend

Cai

Aı̈t-Kadi

Brisson

2004

J of Applied Polymer Sci

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“…However the value of the entanglement plateau which could be inferred from the data (approximately G 0 N = 50 Pa) is extremely low, compared with values reported for other molten polymers. [29] In the literature, the lowest G 0 N found is 1 000 Pa for poly(ndodecyl methacrylate). This throws a shadow of doubt about the origin of the G9 A G99 behavior contemplated in Figure 5, since the value of the molecular weight between entanglements, M e , (obtained through the well known equation M e = qPT/G 0 N ) would be absurd.…”

Section: Photographs Ofmentioning

confidence: 99%

“…This throws a shadow of doubt about the origin of the G9 A G99 behavior contemplated in Figure 5, since the value of the molecular weight between entanglements, M e , (obtained through the well known equation M e = qPT/G 0 N ) would be absurd. Any attempt to apply the models which correlate chain parameters with entanglement plateau modulus, [29,30,32] is discarded. Therefore we contemplate the possibility that this result is caused by a mesoscale structure on length scales larger than the chain size.…”

Section: Photographs Ofmentioning

confidence: 99%

Rheological Features of a Novel Poly(spiro phosphazene)

Carriedo

Gómez‐Elipe

Alonso

et al. 2001

Macromol. Chem. Phys.

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A study of the rheology of a new poly(2,2′‐dioxybiphenyl)phosphazene is presented. The results are conditioned by a two‐phase morphology and by the anisotropy of the melt, observed by microscopy in the range 200–320°C. Two temperature regions are distinguished: the range 260–320°C is characterized by the presence of a plateau zone (with G′ > G″) at intermediate frequencies, which is not detected at the range 220–260°C. The origin of this plateau is discussed. The typical rheological behavior of thermotropics, like three regions for the viscosity function and concentric “marble‐like” surface texture, is observed in plate‐plate flow, but not in extrusion flow.

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Analysis of variation of molecular parameters of natural rubber during vulcanization in conformational tube model. II. Influence of sulfur/accelerator ratio

Cerveny

Marzocca

1999

J. Appl. Polym. Sci.

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A natural rubber (NR) with a conventional sulfur cure system and a ratio of sulfur/accelerator (⍀) equal to 3 was investigated. The network structure of the NR during vulcanization was analyzed using a model of rubber elasticity based on the tube concept, which was applied to the treatment of the stress-strain measurements. The influence of cure time and temperature on the chemical crosslinks density was analyzed. The values were compared with those obtained by means of an equilibrium volume swelling measurement. The differences between samples of NR cured with ⍀ ϭ 3 and 1.5 were analyzed.

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Correlations between chain parameters and the plateau modulus of polymers

Cited by 116 publications

References 6 publications

Rheological quantification of molecular parameters: Application to a hydrogen bond forming blend

Rheological quantification of molecular parameters: Application to a hydrogen bond forming blend

Rheological Features of a Novel Poly(spiro phosphazene)

Analysis of variation of molecular parameters of natural rubber during vulcanization in conformational tube model. II. Influence of sulfur/accelerator ratio

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