Cyclic polymers: Advances in their synthesis, properties, and biomedical applications

R Liénard, J De Winter… - Journal of Polymer …, 2020 - Wiley Online Library
Since the time first synthetic macrocycles were observed as academic curiosities, great
advances have been made. Thanks to the development of controlled polymerization …

Recyclable cyclic bio-based acrylic polymer via pairwise monomer enchainment by a trifunctional Lewis pair

Y Song, J He, Y Zhang, RA Gilsdorf, EYX Chen - Nature Chemistry, 2023 - nature.com
The existing catalyst/initiator systems and methodologies used for the synthesis of polymers
can access only a few cyclic polymers composed entirely of a single monomer type, and the …

Nonlinear shear rheology of entangled polymer rings

D Parisi, S Costanzo, Y Jeong, J Ahn, T Chang… - …, 2021 - ACS Publications
Steady-state shear viscosity η (γ̇) of unconcatenated ring polymer melts as a function of the
shear rate γ̇ is studied by a combination of experiments, simulations, and theory …

Proton-triggered topological transformation in superbase-mediated selective polymerization enables access to ultrahigh-molar-mass cyclic polymers

L Zhou, LT Reilly, C Shi, EC Quinn, EYX Chen - Nature Chemistry, 2024 - nature.com
The selective synthesis of ultrahigh-molar-mass (UHMM,> 2 million Da) cyclic polymers is
challenging as an exceptional degree of spatiotemporal control is required to overcome the …

Topology Matters: Conformation and Microscopic Dynamics of Ring Polymers

M Kruteva, J Allgaier, D Richter - Macromolecules, 2023 - ACS Publications
Ring polymers have fascinated theorists, simulators, and experimentalists as they are the
simplest polymer without ends, giving rise to important topology related properties. We …

Stress relaxation in symmetric ring-linear polymer blends at low ring fractions

D Parisi, J Ahn, T Chang, D Vlassopoulos… - …, 2020 - ACS Publications
We combine linear viscoelastic measurements and modeling in order to explore the
dynamics of blends of the same-molecular-weight ring and linear polymers in the regime of …

Threading–unthreading transition of linear-ring polymer blends in extensional flow

A Borger, W Wang, TC O'Connor, T Ge… - ACS Macro …, 2020 - ACS Publications
Adding small amounts of ring polymers to a matrix of their linear counterparts is known to
increase the zero-shear-rate viscosity because of linear-ring threading. Uniaxial extensional …

Intrinsic viscosity of cyclic polystyrene

Y Jeong, Y Jin, T Chang, F Uhlik, J Roovers - Macromolecules, 2017 - ACS Publications
The intrinsic viscosity of cyclic polystyrenes (C-PS) and linear polystyrenes (L-PS) with
molecular weight (MW) ranging from 16K to 370K was measured in THF using size …

Nonlinear rheometry of entangled polymeric rings and ring-linear blends

D Parisi, M Kaliva, S Costanzo, Q Huang, PJ Lutz… - Journal of …, 2021 - pubs.aip.org
We present a comprehensive experimental rheological dataset for purified entangled ring
polystyrenes and their blends with linear chains in nonlinear shear and elongation. In …

Glass transition temperature of cyclic polystyrene and the linear counterpart contamination effect

L Gao, J Oh, Y Tu, T Chang, CY Li - Polymer, 2019 - Elsevier
We present here a systematic investigation on the glass transition temperature (T g) for a
series of highly purified cyclic polystyrene (c-PS) samples with molecular weight (MW) …