Fully bio- and CO2-sourced non-isocyanate polyurethanes (NIPUs) were synthesized by reaction of carbonated soybean oil (CSBO) either with biobased short diamines or amino-telechelic oligoamides derived from fatty acids to achieve respectively thermoset thermoplastic NIPUs. Biobased vegetable oils first obtained metal-free coupling reactions CO2 epoxidized under supercritical conditions (120 °C, 100 bar) before complete characterization FTIR, 1H NMR, electrospray ionization mass spectroscopy...

Abstract Since the time first synthetic macrocycles were observed as academic curiosities, great advances have been made. Thanks to development of controlled polymerization processes, new catalytic systems and characterization techniques during last decades, well‐defined cyclic polymers are now readily accessible. This further permits determination their unique set properties, mainly due lack chain ends, use for industrial applications can be foreshadowed. review aims give an overview on...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTIncorporation of Different End Groups in Conjugated Polymers Using Functional Nickel InitiatorsAlfons Smeets†, Karlien Van den Bergh†, Julien De Winter‡, Pascal Gerbaux‡, Thierry Verbiest†, and Guy Koeckelberghs*†View Author Information† Laboratory Molecular Electronics Photonics, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium‡ Mass Spectrometry Center, Organic Chemistry...

Ring closure click chemistry methods have been used to produce cyclic c-PLLA and c-PDLA of a number-average molecular weight close 10 kg/mol. The effects stereochemistry the polymer chains their topology on structure, nucleation, crystallization were studied in detail employing wide-angle X-ray scattering (WAXS), small-angle (SAXS), polarized light optical microscopy (PLOM), standard advanced differential scanning calorimetry (DSC). crystal structures linear PLAs are identical each other, no...

Shape-memory polymers (SMPs) are a class of stimuli-responsive materials that have attracted tremendous attention in various applications, especially the medical field. While most SMPs thermally actuated, relating to change thermal transition (e.g., melting temperature), can be actuated upon exposure light emerging. Recently, there has been new interest into multiple order cover range applications for these smart materials. In this work, poly(ester-urethane)s (PURs) made heating-responsive...

Developing intrinsic self-healing polymeric materials is of great interest nowadays to extend material lifetime and/or prevent the replacement damaged pieces. Spontaneously humidity-sensitive healable polymer network built around dynamic covalent B-O bonds was templated by using iminoboronate-based boroxine derivatives. Taking advantage boroxine/boronic acid equilibrium and iminoboronate chemistry, it possible construct able self-heal without requiring any energy-demanding external...

Polyhydroxyurethanes (PHU), obtained from CO2-based cyclic carbonates (CC) and polyamines, are known as greener safer alternatives to conventional polyurethanes. Interestingly, the hydroxyurethane moieties present along PHU's backbone offer unexplored opportunities in terms of enhanced adhesion mechanical properties that could be a major breakthrough many structural applications. Furthermore, PHUs have shown thermomechanical recyclability arising ability participate reversible exchange...

Polythiophenes with alcohol, tosylate, azide, ethynylene, carboxylic acid, and amine end groups were prepared by a combination of functionalized nickel initiators postpolymerization reactions. The azide ethynylene polymers subsequently used in click reaction to produce conjugated block copolymer. Finally, triblock-copolymer was synthesized means chain growth polymerization initiated binuclear initiator.

Abstract Nowadays, numerous experimental and theoretical studies are devoted to the research field of polythiophenes other electroconjugated polymers due huge potentialities those conducting polymers. Synthetic procedures now developed reach highest control over both polymerization analytical methodologies allowing an in‐depth straightforward characterization polymer samples without any required doubt. Mass spectrometry in particular MALDI‐ToF measurements definitively suitable meet...

Abstract The organocatalytic coupling of CO 2 with oxetanes is investigated under solvent‐free conditions. influence the main reaction parameters (type system, pressure, and temperature) on yield, product formed, selectivity are discussed. An onium salt combined a fluorinated alcohol promotes efficient selective synthesis α,ω‐hydroxyl oligocarbonates by at 130 °C pressure as low MPa. NMR characterizations were correlated matrix‐assisted laser desorption/ionization time‐of‐flight mass...

We report a novel class of star-shaped multiazobenzene photoswitches comprising individual photochromes connected to central trisubstituted 1,3,5-benzene core. The unique design such C3-symmetric molecules, consisting conformationally rigid and pseudoplanar scaffolds, made it possible explore the role electronic decoupling in isomerization azobenzene units. our tris-, bis-, mono(azobenzene) compounds limits π-conjugation between switches belonging same molecule, thus enabling efficient...

Iminophosphoranes with the general formula (R3P═NR′) have great potential in synthetic chemistry as valuable precursors/intermediates organic synthesis or building blocks for various compounds. However, approaches and conditions to prepare iminophosphoranes are still poorly understood, limiting utility of this materials. In article, a simple efficient previously unattainable poly(arylene iminophosphoranes) is reported. The azide-phosphine Staudinger polycondensation used, reaction carefully...

Artificial enzymes based on polystyrene copolymers featuring a metal complex within their structure, so-called Single Chain Nanoparticles (SCNPs), are currently discussed as hybrid heterogeneous/homogeneous catalysts. Using styrene (derivative) building blocks,...

Cobalt-mediated radical coupling (CMRC) is successfully applied to poly(vinyl acetate) (PVAc) and poly(N-vinylpyrrolidone) (PNVP) precursors for the first time. The process based on addition of isoprene onto polymer chains preformed by controlled polymerization with cobalt complexes (CMRP). extents were high (>90%) moderate (75−80%) PVAc PNVP precursors, respectively. Effects length conditions used in step efficiency are discussed. Mass spectrometry (MS) nuclear magnetic resonance (NMR)...

A tandem mass spectrometry-based method is developed to determine the degree of purity achieved in cyclization a linear poly(<sc>l</sc>-lactide).

We just clicked: A convergent approach consisting of two successive copper(I)-catalyzed azide–alkyne cycloaddition "click" reactions leads to a diblock copolymer in which the blocks are linked by rotaxane-type mechanical bond (see scheme). Rotaxane formation is templated square-planar PdII complex. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please...

Poly(3-hexylthiophene)s were synthesized with phosphonic ester, pyridine, thiol, and phenol end-groups using functionalized air-stable Ni initiators. The protected thiol- phenol-functionalized P3HTs converted into thiol by quantitative postpolymerization reactions. 1H NMR MALDI–ToF analysis showed very high degrees of functionalization strong control over the polymerization except for pyridine P3HT. These functional used to prepare hybrid materials from a broad variety nanoparticles,...

One of the main issues when using traveling wave ion mobility spectrometry (TWIMS) for determination collisional cross-section (CCS) concerns need a robust calibration procedure built from referent ions known CCS. Here, we implement synthetic polymer as CCS calibrants in positive mode. Based on their intrinsic polydispersities, polymers offer single sample opportunity to generate, upon electrospray ionization, numerous covering broad mass range and large window different charge states at...

We investigate the scope of organocatalyzed step-growth copolymerization CO2-sourced exovinylene bicyclic carbonates with bio-based diols into polycarbonates. A series regioregular poly(oxo-carbonate)s were prepared from sugar- (1,4-butanediol and isosorbide) or lignin-derived (1,4-benzenedimethanol 1,4-cyclohexanediol) at 25 °C 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as a catalyst, their defect-free structure was confirmed by nuclear magnetic resonance spectroscopy studies. Their...

Cobalt-mediated radical coupling (CMRC) is a straightforward approach to the synthesis of symmetrical macromolecules that relies on addition 1,3-diene compounds onto polymer precursors preformed by cobalt-mediated polymerization (CMRP). Mechanistic features make this process so efficient for are reported here. The mechanism was established basis NMR spectroscopy and MALDI-MS analyses product corroborated DFT calculations. A key feature CMRC preferential insertion two diene units in middle...

The use of different phosphazene bases has been investigated as catalysts in polymerization [R,S]-4-benzyloxycarbonyl-3,3-dimethyl-2-oxetanone (dMMLABz) presence carboxylic acids used initiators. Whatever the catalyst considered (P1-t-Bu, P2-t-Bu, or P4-t-Bu) a very good control over obtained terms polyester molecular weights and end-groups fidelity attested by spectroscopic techniques such 1H NMR, gel permeation chromatography (GPC) matrix assisted laser desorption ionization-mass...