In isotactic poly(methyl methacrylate) (PMMA), we investigate the dynamics of the ester methyl groups by means of deuteron magnetic resonance (DMR) in a deuterated sample. We find that the motion of the CD(3)-group affects the deuteron spin-lattice relaxation as well as the DMR line shape in a characteristic way. Quadrupolar order spin lattice relaxation measurements between T=291 K and T=70 K ...

Ageing and stabilization polymers is a major part of materials science. Aging of polymers defined as a set of chemical and physical transformations, leads to the loss of their set the desired properties. The main role in these transformations belong to chemical processes of degradation and crosslinking of macromolecules. Processes decomposition and structuring polymer conjugates include radical...

Infrared and Raman spectra of samples of poly(vinyl fluoride) (PVF) have been recorded. The vibrational spectra have been analyzed by means of normal-mode calculations. A force field was derived by using Zfluorobutane as a model compound. Crowder’s force field for hydrofluorocarbons was employed as a starting point and subsequently refined in application to secondaty fluorides. A planar zigzag,...

"Living" anionic, cationic, metalloporphyrin and ring-opening metathesis polymer­ izations have been used to prepare well-defined side-chain liquid crystalline homopolymers, block and graft copolymers and statistical copolymers. This paper analyzes their successes and failures by reviewing the mechanistic aspects and experimental conditions of each type of polymerization, and identifies other c...

This virtual issue collects articles originating from the Collaborative Research Center/Transregio (CRC/Transregio) TRR 102 that was funded by Deutsche Forschungsgemeinschaft (German Foundation) 2011 to 2023. The CRC a joint activity between Martin Luther University Halle-Wittenberg and Leipzig University. Furthermore, projects several neighboring research institutions were included. Its title,...

In this issue of Chem, Chen and coworkers explore the closed-loop chemical recycling a new polymer formed from “hybrid” monomer design. The reported material combines advantageous properties analogous homopolymers or copolymers, such as high polymerizability recyclability, while also significantly improving on thermomechanical performance. Synthetic chemistry helped to modernize global material...

Over the last century, polymers are everywhere we look, have transformed our daily lives, and gained global acceptance. From clothes wear, to utensils used by scientists around world in labs, current rate of activities standard living couldn't be maintained without plastics all shapes or forms. The majority consume everyday still obtained from fossil fuels rate, but also efficacy, with which th...

Monaryloxide pyrrolide (MAP) molybdenum imido alkylidene complexes of the type Mo(NAr)(CHCMe2R)(Me2Pyr)(OR′) (Me2Pyr = 2,5dimethylpyrrolide) have been prepared in which NAr is an ortho-substituted phenylimido group (X = Cl (NAr), CF3 (NAr ), i-Pr (NAr), t-Bu (NAr), mesityl (NAr), or TRIP (TRIP = triisopropylphenyl; NAr)) and OR′ = O-2,3,5,6(C6H5)4C6H (OTPP), O-2,6-(2,4,6-Me3C6H2)2C6H3 (OHMT), o...