Branch-Point Motion in Architecturally Complex Polymers: Estimation of Hopping Parameters from Computer Simulations and Experiments

Bačová, Petra; Lentzakis, Helen; Read, Daniel J.; Moreno, Angel J.; Vlassopoulos, Dimitris; Das, Chinmay

doi:10.1021/ma5003936

Cited by 18 publications

(25 citation statements)

References 49 publications

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“…There is a place here for further experiments on model materials. There is also an increasing possibility of probing the underlying physical mechanisms, and indeed the basis for the tube modeling framework, via computer simulation …”

Section: Discussionmentioning

confidence: 99%

“…It may also be due to the difficulty of defining a well defined relaxation time for short side arms. Recent work has examined the branchpoint diffusion using computer simulation and experiments on comb polymers, concluding that hopping in the diluted tube gives the most consistent picture over a range of different chain architectures. Tube dilution function. As noted above, there remains some debate as the correct dilution exponent

α

for polymer melts.…”

Section: From Molecules To Rheologymentioning

confidence: 99%

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From reactor to rheology in industrial polymers

Read

2014

J Polym Sci B Polym Phys

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This article reviews current efforts towards quantitative prediction of rheological properties of industrial polymer resins, based upon their polydisperse branched molecular structure. This involves both an understanding of how reactor and reaction conditions influence the distribution of chain lengths and branch placement (which is the province of reactor engineering) and an understanding of how the molecular structures in turn give rise to the rheology (the province of polymer physics). Both fields are reviewed at an introductory level, focussing in particular on developments in theoretical prediction of rheology for both entangled model polymers and industrial polymers. Finally, we discuss three classes of reaction for which the fields of reactor engineering and polymer physics have been truly combined to produce predictions from reactor to rheology.

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Section: Discussionmentioning

confidence: 99%

α

for polymer melts.…”

Section: From Molecules To Rheologymentioning

confidence: 99%

From reactor to rheology in industrial polymers

Read

2014

J Polym Sci B Polym Phys

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“…We use a single segment length Z s ; though the synthesis procedure should create a wide distribution of Z s . The value of p 2 can be different by a factor of 2 from the value used here and may depend on the architecture/chemistry [Bačová et al, 2014]. Considering these uncertainties, the agreements between the fit values and the estimates from Eq.…”

Section: Comparisons With Experimentsmentioning

confidence: 86%

“…We expect these estimates for τ a to have large uncertainty (up to a factor 2) [Bačová et al, 2014].…”

Section: Comparisons With Experimentsmentioning

confidence: 99%

“…The values of α and p 2 used here were found to describe the linear relaxation of a number of different resins with different level of branching and with different chemistries [Das et al, 2006a,b;Chambon et al, 2008;Read et al, 2011;Hutchings et al, 2012]. Our estimates for τ a from visual inspection of the phase angle could give an error of a factor 2 [Bačová et al, 2014]. We use a single segment length Z s ; though the synthesis procedure should create a wide distribution of Z s .…”

Section: Comparisons With Experimentsmentioning

confidence: 99%

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Pom-pom-like constitutive equations for comb polymers

Lentzakis

Das

Vlassopoulos

et al. 2014

Journal of Rheology

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In analogy with the pom-pom model, we introduce a simple model for comb polymers with multiple side-arms attached to a linear backbone by considering a set of coupled equations describing the stretch in the individual inter-branch backbone segments.The stretch equations predict a sudden onset of backbone stretch as the flow rate is increased. Drag-strain coupling smooths this transition to some extent. For a series of well characterized polyisoprene and polystyrene combs, we find good agreement with the experimentally determined transient stress growth coefficients in uniaxial extension.

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