Results 51 to 60 of about 6,513 (187)

Facile Approach to Modulating Stereochemistry in Ring‐Opening Metathesis Polymerization of Cyclooctadiene

Journal of Polymer Science, EarlyView.
The stereochemistry of polybutadiene made by ring‐opening metathesis polymerization (ROMP) evolves both during and after polymerization, as secondary metathesis shifts cis‐rich kinetic products toward trans‐rich equilibrium compositions. By tuning catalyst identity, additives, temperature, and reaction time, polybutadienes with 28%–80% trans content ...
Amira S. Eldin, Michael D. Schulz
wiley   +1 more source

Screening Surface Modifications to Benzene to Improve Solubility in Hydroxyl‐Terminated Polybutadiene (HTPB)—A DFT Demonstration

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT The objective of this paper is to demonstrate the advantage of computationally pre‐screening surface‐modifying material candidates, using density functional theory (DFT), to inform experimental synthesis and formulation efforts. This demonstration focuses on improving the solubility of benzene‐based materials in hydroxyl‐terminated ...
Samantha E. Knoth
wiley   +1 more source

Porous Modified Calcium Carbonate as an Efficient Carrier for Gallic and Ascorbic Acids in Humidity‐Activated Oxygen Scavenging Systems

Packaging Technology and Science, EarlyView.
Porous modified calcium carbonate (MCC) is presented as an efficient carrier for humidity‐activated oxygen scavengers based on gallic acid and ascorbic acid. The porous MCC structure preserves high accessibility of the active compounds, enabling effective oxygen scavenging under high relative humidity, with performance governed by loading level ...
Nastasia M. Coray, Bettina Röcker, Gabriel Mäder, Fabien W. Monnard, Matthias Welker, Joachim Schoelkopf, Selcuk Yildirim   +6 more
wiley   +1 more source

Highly integrated, alignment healing, and full‐recyclable multifunctional flexible devices based on dynamic covalent bonds

Smart Molecules, EarlyView.
This study addresses stability, repair, and recycling in flexible devices using polymers with identical dynamic bonds but incompatible backbones. This enables robust integration, precise self‐healing, and full recyclability. We demonstrate optoelectronic sensors that, after damage, magnetically self‐assemble and heal upon heating.
Xianfei Cao, Yong Qi, Wenbin Niu, Bingtao Tang, Shufen Zhang   +4 more
wiley   +1 more source

Field‐Cycling NMR Relaxometry in Tire Elastomer Science

Magnetic Resonance in Chemistry, Volume 64, Issue 9, Page 801-820, September 2026.
Field‐cycling NMR relaxometry has established as an ideal tool to investigate multiscale polymer dynamics. Here, we review and discuss applications on elastomers and elastomer compounds of interest for the tire industry to obtain information on segmental dynamics and on polymer dynamics over different regimes as a function of chain length in polymer ...
Francesca Nardelli, Michele Pierigé, Elisa Carignani, Marco Geppi, Francesca Martini, Lucia Calucci   +5 more
wiley   +1 more source

Synthesis of Carboxyl Terminated Polymyrcene by Anionic Polymerization Using CO2 as a Terminating Agent

Journal of Polymer Science, Volume 64, Issue 16, Page 3382-3390, 15 August 2026.
The anionic polymerization of myrcene and termination with carbon dioxide to produce carboxyl terminated chains were investigated. The highest degree of functionalization was obtained in the batch reactor by headspace addition of the CO2 to the unstirred reactor at −78°C.
Trishna K. Chengappa, Juan Marin Angel, Kevin A. Cavicchi   +2 more
wiley   +1 more source

STRUCTURE AND DYNAMICS OF IRREGULAR MULTIARM STAR POLYMERS

Condensed Matter Physics, 2002
Melt properties of highly branched star polymers consisting of a 1,2-polybutadiene core and nearly 270 arms of 1,4-polybutadiene with varying sizes have been investigated using small angle X-ray scattering (SAXS) and dynamic rheological measurements in ...
D.Vlassopoulos, T.Pakula, J.Roovers
doaj   +1 more source

Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system

Polímeros, 2014
The aim of this study was to incorporate an alpha-olefin (1-hexene or 1-dodecene) in a high cis polybutadiene chain, using a neodymium versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system.
Gustavo Monteiro da Silva, Ivana Lourenço de Mello Ferreira, Marcia Parente Melo da Costa, Neusa Maria Tocchetto Pires, Marcos Antonio da Silva Costa   +4 more
doaj   +1 more source

Effect of SBS Copolymer Molecular Structure on the Long‐Term Aging and Resilience of Asphalt Binders: A Multiscale Morphological Study

Macromolecular Materials and Engineering, Volume 311, Issue 8, August 2026.
Vinyl content governs the long‐term ageing resistance of SBS‐modified bitumen. Multiscale AFM, FM, SEM, and FTIR analyses show that low‐vinyl SBS copolymers (L‐SBS, B‐SBS) undergo pronounced bee‐phase growth, stiffening, and network fragmentation after PAV ageing, whereas high‐vinyl variants (HV‐SBS, DB‐SB) retain their morphology and chemistry ...
Sk Sohel Islam, Ayana Ghosh, Bhupendra Singh, Gondaimei Rongmei Naga Ransinchung, Sham S. Ravindranath, Praveenkumar Thaloor Ramesh, Zelalem Mebrate   +6 more
wiley   +1 more source

Instability of styrene/polystyrene/polybutadiene/polystyrene‐b‐polybutadiene emulsions that emulate styrene polymerization in the presence of polybutadiene

Polymer Engineering & Science, 2013
AbstractThis article investigates the room temperature demixing of oil‐in‐oil emulsions containing styrene (St), polybutadiene (PB), a St‐butadiene star block copolymer (BC), and two polystyrene (PS) samples of different molecular weights and is a contribution toward a better understanding of the stability/instability of the reaction mixture in a bulk ...
Velasquez, Eliezer, Oliva, Haydée, Muller, Alejandro, Lopez, Juan, Vega, Jorge Ruben, Meira, Gregorio Raul, Wambach, Mona   +6 more
openaire   +2 more sources