Bulk properties of multibranched polystyrenes from polystyrene macromonomers: rheological behavior I

Namba, Sin-Ichi; Tsukahara, Yasuhisa; Kaeriyama, Kyoji; Okamoto, K.; Takahashi, M.

doi:10.1016/s0032-3861(99)00744-2

Cited by 67 publications

(73 citation statements)

References 26 publications

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“…The stiffened chain conformation can also affect the inter chain interactions and increase the distance between entanglements. In prior studies on similarly structured brush polymers, it has been reported that the plateau modulus is significantly lower when compared with that of the linear counterpart, but the molecular chain relaxation mechanisms are similar to those of other long chain branched polymers; in some cases these high molecular weight molecules do not entangle . In the present work ROMP was used to synthesize a series of densely branched polymers with the same flexible bulky side‐group structure but different backbone DP.…”

Section: Introductionmentioning

confidence: 93%

The linear rheological responses of wedge‐type polymers

Hao

Xia

Daeffler

et al. 2015

J Polym Sci B Polym Phys

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The linear rheological responses of a series of specially designed wedge-type polymers synthesized by the polymerization of large molecular weight monomers have been measured. These wedge polymers contained large side groups which contained three flexible branch chains per polymer chain unit. The master curves for these polymers were obtained by time temperature superposition of dynamic data at different temperatures from the terminal flow regime to well below the glass transition temperature, T g . While these polymers maintained a behavior similar to that of linear polymers, the influence of the large side group structure lead to low entanglement densities and extremely low rubbery plateau modulus values, being near to 13 kPa. The viscosity molecular weight dependence was also somewhat higher than that normally observed for linear polymers, tending toward a power law near to 4.2 rather than the typical 3.4 found in entangled linear chains. The glassy modulus of these branched polymers is also found to be extremely low, being less than 100 MPa at T g 260 C. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B:Polym. Phys. 2015, 00, 000-000KEYWORDS: branched; glassy polymers; macromonomers; rheology; viscoelastic properties; viscosity INTRODUCTION Polymer architecture has long been known to greatly affect the rheological properties of polymeric materials and, for simple linear chains, the reptation model has been highly successful in predicting the rheological behaviors.

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Section: Introductionmentioning

confidence: 93%

The linear rheological responses of wedge‐type polymers

Hao

Xia

Daeffler

et al. 2015

J Polym Sci B Polym Phys

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“…Rheological properties of PS-type polymer brushes have been investigated previously by Tsukahara and co-workers [25]. They discussed the bulk properties of multi-branched PSs by the master curve of the storage dynamic shear modulus G 0 .…”

Section: Diblock Copolymer Brushes and Cylinder Brushesmentioning

confidence: 99%

Architecture of multi-component copolymer brushes

Ishizu¹,

Tsubaki²,

Satoh³

et al. 2002

Designed Monomers and Polymers

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Abstract-In the rst part of this article, the method for the preparation of diblock copolymer brushes from free radical homopolymerization of the corresponding diblock macromonomers is reviewed. These diblock copolymer brushes formed a unimolecular structure in dilute solution. Moreover, it was speculated from angular dependence measurements that diblock copolymer brushes with high aspect ratios took a geometrical anisotropic conformation, such as a cylinder. The cylinder brushes were also derived by cross-linking internal domains of the diblock copolymer brush. The second part reviews the synthesis of prototype amphiphilic copolymer brushes by alternating free radical copolymerization of binary macromonomers. To determine the phase-separated cylindrical domains of alternating copolymer brushes, large aggregates of copolymer brushes in water were constructed. The alternating copolymer brushes led to self-assembliesamong hydrophobic domains during micelle formation.

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“…Indications for the presence of slower relaxation modes associated with structural rearrangements of the backbone were also evident in the measured spectra. In another study, [158] where a direct comparison between comb polymers and polymacromonomers was attempted, the distinct behavior of the two types of polymers led to the conclusion that creation of entanglements is strongly restricted in polymacromonomer systems as a result of the densely grafted structure.…”

Section: Bulk Properties Of Polymacromonomersmentioning

confidence: 99%

The Strength of the Macromonomer Strategy for Complex Macromolecular Architecture: Molecular Characterization, Properties and Applications of Polymacromonomers

Hadjichristidis

Pitsikalis

Iatrou

et al. 2003

Macromol. Rapid Commun.

218

209

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The efficiency of the macromonomer (MM) synthetic strategy for the creation of nonlinear complex macromolecular architectures (miktoarm stars, α,ω‐branched polymers, random/exact comb and graft copolymers, dendritic polymers, molecular brushes) is reviewed. In addition, the solution/bulk properties and the potential applications of polymacromonomers (PMM), as well as new synthetic ideas are presented. The synthesis of macromonomers and living polymacromonomers in situ leads to many novel linear and nonlinear structures, as for example PMM‐b‐PS‐b‐PMM, (PS)2PMM. The use of multichlorosilylstyrenes as monomer/linking agents opens new ways for structures with multichain macromonomeric building blocks.The use of multichlorosilylstyrenes as monomer/linking agents opens new ways for structures having multichain macromonomeric building blocks.magnified imageThe use of multichlorosilylstyrenes as monomer/linking agents opens new ways for structures having multichain macromonomeric building blocks.

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Bulk properties of multibranched polystyrenes from polystyrene macromonomers: rheological behavior I

Cited by 67 publications

References 26 publications

The linear rheological responses of wedge‐type polymers

The linear rheological responses of wedge‐type polymers

Architecture of multi-component copolymer brushes

The Strength of the Macromonomer Strategy for Complex Macromolecular Architecture: Molecular Characterization, Properties and Applications of Polymacromonomers

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