Preparation and properties of monodisperse branched polystyrene

Morton, Maurice; Helminiak, T. E.; Gardkary, S. D.; Bueche, F.

doi:10.1002/pol.1962.1205716537

Cited by 269 publications

(149 citation statements)

References 7 publications

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“…17 For the preparation of star polymers, two general routes are employed, namely the so-called ''core-first'' and ''arm-first'' approaches. [18][19][20][21] While in the latter, the synthesis of single, linear arms allows for good control over the individual length of the arms, 22,23 their subsequent coupling to a core demands a highly effective and selective coupling reaction.…”

Section: Introductionmentioning

confidence: 99%

One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

et al. 2012

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Multifunctional chain transfer agents for RAFT polymerisation were designed for the one-step synthesis of amphiphilic star polymers. Thus, hydrophobically end-capped 3-and 4-arm star polymers, as well as linear ones for reference, were made of the hydrophilic monomer N,N-dimethylacrylamide (DMA) in high yield with molar masses up to 150 000 g mol À1, narrow molar mass distribution (PDI # 1.2) and high end group functionality ($90%). The associative telechelic polymers form transient networks of interconnected aggregates in aqueous solution, thus acting as efficient viscosity enhancers and rheology modifiers, eventually forming hydrogels. The combination of dynamic light scattering (DLS), small angle neutron scattering (SANS) and rheology experiments revealed that several molecular parameters control the structure and therefore the physical properties of the aggregates. In addition to the size of the hydrophilic block (maximum length for connection) and the length of the hydrophobic alkyl chain ends (stickiness), the number of arms (functionality) proved to be a key parameter.

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Section: Introductionmentioning

confidence: 99%

One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

et al. 2012

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“…A variety of approaches has been reported for the synthesis of star polymers [4,5]. The first approach is the arms first method which uses living polymerisation to prepare the arms followed by quenching with a multi-functional coupling agent which serves as the core [6][7][8][9]. The second approach, often known as the nodule method, is also based on living polymerisation.…”

Section: Introductionmentioning

confidence: 99%

Fluorescently tagged star polymers by living radical polymerisation for mucoadhesion and bioadhesion

Limer

Rullay

Miguel

et al. 2006

Reactive and Functional Polymers

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The synthesis of 3-, 5-and 8-arm dimethylaminoethyl methacrylate star polymers are reported, final M n (PDI) = 12.2 K (1.09), 18.9K (1.10) and 38.4 K (1.11), respectively. The synthesis of 3-arm methyl methacrylate and dimethylaminoethyl methacrylate block co-polymer stars is also described. Living polymerisation occurred in all cases providing well defined stars with predictable molecular weights and narrow polydispersity. A fluorescent tag, 2-(8-methacryloyloy-3,6-dioxaoctyl)thioxantheno[2,1,9-dej]isoquinoline-1,3-dione, derived from a commercially available pigment, was incorporated into the star polymers. The fluorescence spectra of the polymers prepared were recorded over a range of pH and the peak emission frequency and intensity have been reported, k ex = 462 nm. All of the multi-arm polymers exhibit fluorescence across a broad pH range with maximum emission at pH 4. A 3-arm star polymer has been demonstrated to show good bioadhesion in rat tissue. A reduced adhesion in epithelial tissues not covered by a viscoelastic mucus gel indicates an increased tendency for mucoadhesion over bioadhesion.

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“…[25,26], exhibit unique properties due to their spatially defined and compact three-dimensional compact structure. Efficient synthetic routes and unique rheological properties make them promising tools for use in drug delivery, biomedical applications, or thermoplastics, amongst other applications [27,28].…”

Section: Introductionmentioning

confidence: 99%

Stochastic and preaveraged nonlinear rheology models for entangled telechelic star polymers

Boudara

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2017

J. Rheol.

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We present a simplified stochastic model designed to exemplify the non-linear rheology of entangled supramolecular polymeric materials. We have developed a simplified stochastic model for the rheology of entangled telechelic star polymers. As a toy model for entanglement effects, we use the Rolie-Poly equations [1] that we decorate with finite extensibility. Additionally, we include a stretch-dependent probability of detachment for the stickers. In both linear and non-linear regimes, we explore the parameter space, indicating the parameter values for which qualitative changes in response to the applied flow are predicted. Theory and results in the linear rheology regime are consistent with previous more detailed work of van Ruymbeke and co-workers [2]. Finally, we develop a pre-averaged version of the stochastic equations described above to obtain a set of non-stochastic coupled equations that produces very similar predictions but requires less computing resources.This pre-averaged model is based on two tensors representing the attached and detached chain populations and a scalar quantity that represents the fraction of these populations. * mmvahb@leeds.ac.uk

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Preparation and properties of monodisperse branched polystyrene

Cited by 269 publications

References 7 publications

One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution

Fluorescently tagged star polymers by living radical polymerisation for mucoadhesion and bioadhesion

Stochastic and preaveraged nonlinear rheology models for entangled telechelic star polymers

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