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The Origin of the Slow Mode in Dilute Aqueous Solutions of PEO

27-Feb-2015 | Jianqi Wang, Macromolecules, 2015

Besides the fast translational diffusion of individual chains, a slow relaxation mode is frequently observed in dilute poly(ethylene oxide) (PEO) aqueous solutions in dynamic laser light scattering (LLS) experiments, which was attributed to some hydrophobic impurities in PEO or interchain ...


Ring-Opening Metathesis Polymerization of a Diolefinic [2]-Catenane–Copper(I) Complex: An Easy Route to Polycatenanes

27-Feb-2015 | José Augusto Berrocal; Louis M. Pitet; Marko M. L. Nieuwenhuizen; Luigi Mandolini; E. W. Meijer; Stefano Di Stefano, Macromolecules, 2015

A dilute (30 mM) dichloromethane solution of the copper(I) complex 1·Cu+ of a [2]-catenane composed of two identical 28-membered macrocyclic alkenes featuring a phenanthroline moiety in the backbone was subjected to ring-opening metathesis polymerization (ROMP) with second-generation Grubbs ...


Spectroscopic Signature of Two Distinct H-Aggregate Species in Poly(3-hexylthiophene)

27-Feb-2015 | Fabian Panzer; Michael Sommer; Heinz Bässler; Mukundan Thelakkat; Anna Köhler, Macromolecules, 2015

In an endeavor to correlate the optoelectronic properties of π-conjugated polymers with their structural properties, we investigated the aggregation of P3HT in THF solution within a temperature range from 300 to 5 K. By detailed steady-state, site-selective, and time-resolved fluorescence ...


Influence of the Solvent Quality on Ring Polymer Dimensions

23-Feb-2015 | Sebastian Gooßen; Ana R. Brás; Wim Pyckhout-Hintzen; Andreas Wischnewski; Dieter Richter; Michael Rubinstein; Jacque ..., Macromolecules, 2015

We present a systematic investigation of well-characterized, experimentally pure polystyrene (PS) rings with molar mass of 161 000 g/mol in dilute solutions. We measure the ring form factor at θ- and good-solvent conditions as well as in a polymeric solvent (linear PS of roughly comparable molar ...


Reason for the High Solubility of Chemically Modified Poly(vinyl alcohol)s in Aqueous Solution

23-Feb-2015 | Kengo Arai; Misumi Okuzono; Toshiyuki Shikata, Macromolecules, 2015

Partially chemically modified poly(vinyl alcohol) synthesized via random introduction of a diol-type monomer (mPVA) shows much higher solubility in water than normal homo poly(vinyl alcohol) (PVA). To clarify the reason for the high solubility of mPVA, we investigated the temperature dependencies ...


Dense, Highly Hydrated Polymer Brushes via Modified Atom-Transfer-Radical-Polymerization: Structure, Surface Interactions, and Frictional Dissipation

30-Dec-2014 | Odeya Tairy; Nir Kampf; Michael J. Driver; Steven P. Armes; Jacob Klein, Macromolecules, 2014

The conditions for atom transfer radical polymerization (ATRP) of poly[2-(methacryloyloxy)ethyl phosphorylcholine] (pMPC) chains are modified to enable much more efficient growth of these poly zwitterionic chains from macroinitiator-coated mica substrates using the “grafting from” technique. In ...


Evidence for Catalyst Association in the Catalyst Transfer Polymerization of Thieno[3,2-b]thiophene

12-Dec-2014 | Pieter Willot; Guy Koeckelberghs, Macromolecules, 2014

The performance of catalyst transfer polymerization (CTP) reactions which depend on catalyst association was studied on 3,6-dioctylthiothieno[3,2-b]thiophene (TT)-monomers. This monomer was selected because a strong association of the catalyst is expected, since the aromaticity of thienothiophene ...


Hydration and Ordering of Lamellar Block Copolymer Films under Controlled Water Vapor

12-Dec-2014 | Yohei Kamata; Andrew J. Parnell; Philipp Gutfreund; Maximilian W. A. Skoda; Andrew J. C. Dennison; Robert Barker; Sh ..., Macromolecules, 2014

Amphiphilic block copolymers within a range of volume fraction spontaneously form vesicles in aqueous solution, where a water core is enclosed by a polymer bilayer. Thin-film rehydration is a method used to produce vesicles routinely; a thin film is immersed in water, the film swells, and ...


Quadruple-Stimuli-Sensitive Polymeric Nanocarriers for Controlled Release under Combined Stimulation

12-Dec-2014 | Ziquan Cao; Hao Wu; Jie Dong; Guojie Wang, Macromolecules, 2014

Here we report a novel quadruple-stimuli-responsive block copolymer nanocarrier sensitive to pH, temperature, light, and reducing agent. The well-defined amphiphilic diblock copolymer poly(2-nitrobenzyl methacrylate)-SS-poly(dimethylaminoethyl methacrylate) (PNBM-SS-PDMAEMA) was synthesized via ...


Temperature Driven Macromolecule Separation by Nanoconfinement

10-Dec-2014 | Ilaria De Santo; Filippo Causa; Paolo A. Netti, Macromolecules, 2014

We focused on the influence of temperature variations on macromolecule partitioning between unconfined and nanoconfined areas in nanoslits using single molecule measurements. We evaluated the number of fluorescent poly(ethylene glycol) (PEG) molecules confined in glass nanoslits in several ...


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