Abstract Alkyl bromides are used as initiators in most of the atom transfer radical polymerization (ATRP) process and play an important role for controlling ATRP equilibrium. In this work, effect solvent on equilibrium constant ( K ) rate activation k act three isomeric alkyl [namely, N -phenyl(3-bromo-3-methyl)succinimide, -phenyl(3-bromo-4-methyl)succinimide, -phenyl(3-bromomethyl)succinimide...

Front Cover: In article number 2000670 by Yoshihiko Kimura and Takaya Terashima, hexa(ethylene glycol) di(meth)acrylates efficiently interact with a potassium cation to dynamically form pseudo cyclic monomers. Combined such supramolecular technique, RAFT cyclopolymerization of template is developed successfully synthesize cyclopolymers comprising 24-membered rings. The serve as thermoresponsive...

Roll-To-Roll Manufacturing In article number 2207257, Metin Sitti and co-workers report a two-step curing-based roll-to-roll manufacturing process for the improvement of repeatability durability flexible silicone molds patterned with complicated adhesive microstructures against highly polyurethane acrylates. Using proposed process, mold demonstrates high up to 1000 cycles without significant de...

-We have studied the mesomorphism of p-acryloyland p-methacryloy1-oxy-p'substituted azoand azoxybenzenes. Polymers, obtained by free radical polymerization of these compounds in solution, give anisotropic melts at T,. According tox-ray diffraction data the polymers are characterized by a smectic structure. There is no correlation between the thermal behaviour of monomers and polymers. The optic...

The objective of this study was to investigate the behavior of highly functional acrylates, during isothermal ultraviolet (UV) curing. The materials included a penta-functional acrylate and two acrylated hyperbranched polymers, one with a stiff polyester core and one with a more flexible polyether core. In particular, the influence of UV intensity and reactive blend composition on structural tr...

AA and its esters are unlikely to persist in the environment. Acrylates have medium to high mobility for adsorption and desorption to soils. They are not expected to bind to soil or sediment. If released to air, they will undergo photo-degradation within days. AA and all of the esters are readily biodegradable except t-BA, which is inherently biodegradable. In contact with water, abiotic hydrol...

An efficient palladium-catalyzed tandem approach for the synthesis of highly functionalized tetrahydroquinazolines 4a–q, and 5a–f by the reaction of o-haloanilines 1a–g with acrylates 2a–d and isothiocyanates 3aa–3ah/isocyanates 3ba–3bfvia Heck-conjoined amidation/thioamidation and concomitant chemoselective Michael-addition is described. A competitive experiment showed that isothiocyanates wer...

Short-chain branching in polyethylene, which involves a six-centre transition state, is studied by ab initio quantum mechanics up to the QCISD(T) level. The calculation gives a (low-pressure) activation energy of 73 kJ mol and a frequency factor of 4:8 × 10 s: The frequency factor for this six-centre transition state is expected to be of acceptable accuracy and also applicable to homologous sys...

The rhodium-catalyzed reaction of electron-deficient alkenes with substituted aryldiazoacetates and vinyldiazoacetates results in highly stereoselective cyclopropanations. With adamantylglycine derived catalyst Rh2(S-TCPTAD)4, high asymmetric induction (up to 98% ee) can be obtained with a range of substrates. Computational studies suggest that the reaction is facilitated by weak interaction be...

The objective of this study is to use differential scanning calorimetry (DSC) to characterize the curing kinetics of Al2O3 and hydroxyapatite suspensions in acrylates. The heat evolution of the acrylate premix and ceramic suspensions in dynamic and isothermal curing was measured. The calculated activation energies for the acrylate premix and the two ceramic suspensions were 133, 74, and 78 kJ/m...