Viscoelastic and dielectric studies on comb- and brush-shaped poly(n-butyl acrylate)

Berry, G. C.; Kahle, S.; Ohno, Shigeki; Matyjaszewski, Krzysztof; Pakuła, Tadeusz

doi:10.1016/j.polymer.2008.06.015

Cited by 18 publications

(11 citation statements)

References 27 publications

(44 reference statements)

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“…Applying the MM approach to the synthesis ensures that each repeat unit in the backbone is grafted with the same side‐group structure, leading to very large branch to backbone ratios and a dense distribution of branching points . Due to the high density of chain packing, there are strong interactions between the side‐group structures, the polymer backbones are stiffened and the persistence length of the brush chain increases with increasing side chain density . The stiffened chain conformation can also affect the inter chain interactions and increase the distance between entanglements.…”

Section: Introductionmentioning

confidence: 83%

“…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: 83%

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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: 83%

Section: Introductionmentioning

confidence: 83%

The linear rheological responses of wedge‐type polymers

Hao

Xia

Daeffler

et al. 2015

J Polym Sci B Polym Phys

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“…Bottle‐brush polymers are a special class of graft copolymers that usually contain a linear polymer backbone and densely grafted side chains 6, 7. Synthetically, bottle‐brush polymers can be prepared by three major approaches: (1) grafting to;8–12 (2) grafting from;13–17 and (3) grafting through 7, 18–21. Each approach has intrinsic advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Cationic Salt‐Responsive Bottle‐Brush Polymers

Yao

Chen

Zhang

et al. 2013

Macromol. Rapid Commun.

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A class of cationic bottle-brush polymers that show ionic strength-dependent stimuli responsiveness is prepared. Brush polymers with norbornene as backbone and quaternary ammonium (QA)-containing polycaprolactone copolymers as side chains are synthesized by a combination of ring-opening metathesis polymerization, ring-opening polymerization, and click reaction. In water with low ionic strength, brush polymers are soluble due to the strong electrostatic repulsion between cationic QA groups. As the addition of salt to increase ionic strength, single brush polymers undergo a transition from extended conformation to collapsed state and finally become insoluble in solution due to the screening effect of salts that yield the once-dominant electrostatic interactions among QA species to hydrophobic-hydrophobic interactions.

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“…Deffieux and coworkers have demonstrated a dependence of the bottlebrush polymer persistence length on the grafting density using neutron scattering, with high grafting densities resulting in much larger persistence lengths for bottlebrush polymers with polystyrene grafts . This phenomenon was also observed via dynamic mechanical analysis …”

Section: Graft Polymerizaton Using Raftmentioning

confidence: 85%

Graft polymer synthesis by RAFT transfer‐to

Foster

Radzinski

Matson

2017

J. Polym. Sci. Part A: Polym. Chem.

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The synthesis of graft polymers via controlled polymerization techniques has enabled the facile modification of the surface properties of a variety of substrates. Three grafting methods are typically highlighted in the literature: grafting‐to, grafting‐from, and grafting‐through. However, a fourth method exists when grafting is conducted using reversible addition‐fragmentation chain transfer (RAFT) polymerization, which we refer to as transfer‐to. Transfer‐to differs from the other grafting strategies in the types of structural defects and impurities that arise during polymerization. This review addresses important considerations when conducting RAFT transfer‐to, including RAFT chain transfer agent selection, monomer structure, and reaction conditions. In addition, we highlight key mechanistic differences between grafting‐from and transfer‐to and their effects on the structure and sample composition of the resulting graft polymers. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 2865–2876

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Viscoelastic and dielectric studies on comb- and brush-shaped poly(n-butyl acrylate)

Cited by 18 publications

References 27 publications

The linear rheological responses of wedge‐type polymers

The linear rheological responses of wedge‐type polymers

Cationic Salt‐Responsive Bottle‐Brush Polymers

Graft polymer synthesis by RAFT transfer‐to

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