Structure and rheology of branched polyamide 6 polymers from their reaction recipe

Ruymbeke, Evelyne Van; Slot, Jjm Han; Kapnistos, M.; Steeman, P. A. M.

doi:10.1039/c3sm50226k

Cited by 21 publications

(31 citation statements)

References 46 publications

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“…This has been used successfully to describe simple topologies (e.g., H-polymers, pom-poms, Cayley-trees) [76] as well as polydisperse branched polyamides [74].…”

Section: Hierarchical Relaxationmentioning

confidence: 99%

“…Topological polydispersity, especially the effects of different molecular architectures for branched polymers, as well as polydispersity in molecular weight, naturally brings us to the much more complex situation of commercial polymers. Recently, there have been several successful efforts to predict the viscoelasticity for several commercial branched polymers by combining knowledge from the synthesis mechanism and sizeexclusion chromatography to generate a large complex mixture of different architectures that is representative for the actual sample and, via combination with one of the hierarchical tube models, accurate predictions were made for commercial LDPE's (using BoB [71,72]) and branched polyamides (using TMA [74]). …”

Section: Applications To Various Topologiesmentioning

confidence: 99%

“…Numerically, it evolves forward in time by calculating the relaxation based on the previous step. The model can take as input the predicted random molecular structures (based on reaction kinetics), and thereby successfully describe industrial-grade polydisperse branched material [72,73,74].…”

Section: Hierarchical Relaxationmentioning

confidence: 99%

“…The TMA model [63,74,75] operates in a similar way to the BoB model, by calculating the relaxation incrementally in time, in terms of the survival probability of unrelaxed segments, in terms of relaxation times due to reptation, TCR and Rouse dynamics, which depend on the state of relaxation of the various arms and branches of the branched molecule [63,74,75]. This has been used successfully to describe simple topologies (e.g., H-polymers, pom-poms, Cayley-trees) [76] as well as polydisperse branched polyamides [74].…”

Section: Hierarchical Relaxationmentioning

confidence: 99%

See 3 more Smart Citations

Perspectives on the viscoelasticity and flow behavior of entangled linear and branched polymers

Snijkers

Pasquino

Olmsted

et al. 2015

J. Phys.: Condens. Matter

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We briefly review the recent advances in the rheology of entangled polymers and identify emerging research trends and outstanding challenges, especially with respect to branched polymers. Emphasis is placed on the role of well-characterized model systems, as well as the synergy of synthesis-characterization, rheometry and modeling/simulations. The theoretical framework for understanding the observed linear and nonlinear rheological phenomena is the tube model, which is critically assessed in view of its successes and shortcomings, whereas alternative approaches are briefly discussed. Finally, intriguing experimental findings and controversial issues that merit consistent explanation, such as shear banding instabilities, multiple stress overshoots in transient simple shear and enhanced steady-state elongational viscosity in polymer solutions, are discussed, whereas future directions such as branch point dynamics and anisotropic monomeric friction are outlined.

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“…This has been used successfully to describe simple topologies (e.g., H-polymers, pom-poms, Cayley-trees) [76] as well as polydisperse branched polyamides [74].…”

Section: Hierarchical Relaxationmentioning

confidence: 99%

Section: Applications To Various Topologiesmentioning

confidence: 99%

Section: Hierarchical Relaxationmentioning

confidence: 99%

Section: Hierarchical Relaxationmentioning

confidence: 99%

See 2 more Smart Citations

Perspectives on the viscoelasticity and flow behavior of entangled linear and branched polymers

Snijkers

Pasquino

Olmsted

et al. 2015

J. Phys.: Condens. Matter

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“…The system "B1 + B3 + A2 + A1B1" resembles a randomly branched polyamide and will be used here as an illustrative example. [4][5][6]13 ] The table lists the four ( K = 4) species of monomers that take part in the reaction, their A functionality In the example, the B's are in excess, g tot > f tot . So, some B groups are free, and, hence, not all B3 monomers will act as branch point in a polymer molecule.…”

Section: The Recipementioning

confidence: 98%

Step‐Growth Polymerizing Systems of General Type “AfiBgi”: Calculating the Bivariate (Molecular Size) × (Number of Branch Points) Weight Distribution Using Generating Functions and Recurrences

Hillegers¹,

Slot

2016

Macro Theory & Simulations

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This study considers step‐growth polymerizing systems of general type “AfiBgi” whereby one or more of the reacting monomer species bear at least three reactive groups. The random polymerization process will lead to a population of polymer molecules in which the individual molecules may differ widely with respect to degree of polymerization and number of branch points. This study presents an algorithmic method to calculate the statistical distribution of weight over these two molecular properties. The method uses bivariate generating functions, recurrences, and integer arithmetic.

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Macromolecular Rheology

Ruymbeke

Vlassopoulos

2022

Macromolecular Engineering

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One of the most important features of polymeric systems is their response to weak external stimuli. Of utmost importance is their reaction to an imposed mechanical load, which reflects their viscoelasticity. The viscoelastic properties of polymers are central to their handling and are responsible for their wide‐ranging applications. In this article, we provide the basic elements of molecular rheology, the science of deformation and flow of matter, which is necessary for understanding polymer viscoelasticity and linking it to molecular characteristics of the studied macromolecules. The presentation is basic and does not require prior knowledge on the topic. It refers to amorphous flexible polymers with emphasis on melts. First, the fundamental aspects of rheological measurements are discussed, followed by a discussion on linear viscoelasticity. Then, the models for the linear viscoelastic response of both unentangled and entangled polymers are presented in detail for different architectures, linear, star, and well‐characterized branched polymers. Subsequently, we focus on the nonlinear viscoelastic regime with particular emphasis on the current state‐of‐the‐art and remaining challenges. Where appropriate, some applications of interest to the industrial practice are briefly discussed. Nonlinear phenomena such as flow instabilities, flow‐induced crystallization, and wall slip are not covered.

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Structure and rheology of branched polyamide 6 polymers from their reaction recipe

Abstract: Link to publication

Cited by 21 publications

References 46 publications

Perspectives on the viscoelasticity and flow behavior of entangled linear and branched polymers

Perspectives on the viscoelasticity and flow behavior of entangled linear and branched polymers

Step‐Growth Polymerizing Systems of General Type “AfiBgi”: Calculating the Bivariate (Molecular Size) × (Number of Branch Points) Weight Distribution Using Generating Functions and Recurrences

Macromolecular Rheology

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