Well-controlled polymerization of methyl methacrylate at 35 °C was achieved by photochemically mediated atom transfer radical using a copper catalyst concentration as low 50–100 ppm. Irradiation λ > 350 nm provided both reduction initially added copper(II) complexed with either PMDETA or TPMA ligand to copper(I) activator and sufficient rate polymerization. Poly(methyl methacrylate) narrow dispersity predictable molar mass obtained when an initiator, such 2-bromopropionitrile, used....

The synthesis and characterization of isotropic magnetorheological elastomer (MRE) with significantly enhanced utility properties is presented. Common drawbacks classical MREs, such as poor particle wettability, dispersibility, low thermo-oxidative stability, chemical insufficient durability, were eliminated by grafting the carbonyl iron (CI) particles poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) using surface-initiated atom transfer radical polymerization (ATRP). Two sets MREs...

This study is focused on the controllable coating of carbonyl iron (CI) particles widely applied in magnetorheology.

ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication the EditorNEXTAtom Transfer Radical Polymerization of Tulipalin A: A Naturally Renewable MonomerJaroslav Mosnáček†‡ and Krzysztof Matyjaszewski*†View Author Information Department Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, Polymer Institute, Slovak Academy Sciences, Dúbravská cesta 9, 842 36 Bratislava, Republic* Corresponding author: Tel +1-412-268-3209; e-mail [email...

A novel and simple method for the preparation of linear, high-molar-mass, thermally stable polylactide stereocomplexes (sc-PLA) with multiwalled carbon nanotubes (MWCNTs) covalently attached to enantiomeric PLA chains is presented. The MWCNTs modified organic spacers terminated −OH groups were used as initiators ring-opening polymerization (ROP) l- d-lactides. weight percentage in final was approximately 1 wt %. nascent (as-polymerized) polymer samples obtained by ROP bulk at 130 °C...

Well-defined PMMA can be prepared using photoRDRP without the necessity of degassing MMA and/or DMSO.

Engineered nanoparticles (ENPs) have potential application in precision farming and sustainable agriculture. Studies shown that ENPs enhance the efficiency of delivery agrochemicals thus, to positively affect environment, thereby improving growth health crops. However, majority research on effects plants agricultural applications been limited controlled laboratory conditions. These conditions do not fully consider various aspects inherent fields under changing weather climate. Some most...

A series of 10- and 20-arm starlike block copolymers containing inner soft poly(n-butyl acrylate) (PBA) outer hard poly(methyl methacrylate) (PMMA) were synthesized by atom transfer radical polymerization (ATRP). Short macroinitiators for preparation copolymers, poly(2-bromoisobutyryloxyethyl (PBiBEA) with degree DP = 10 20, was prepared ATRP trimethylsilyloxyethyl acrylate (HEATMS) subsequently esterified. Partial star coupling during the extension PMMA blocks observed, increased increasing...

Abstract Nanocomposites based on poly(ethylene terephthalate) (PET) and expanded graphite (EG) have been prepared by in situ polymerization. Morphology of the nanocomposites has examined electronic microscopy. The relationship between preparation method, morphology, electrical conductivity was studied. Electronic microscopy images reveal that exhibit well dispersed graphene platelets. incorporation EG to PET results a sharp insulator‐to‐conductor transition with percolation threshold (ϕ c )...

A new class of superabsorbent hydrogels was synthesized by copolymerization acrylamide with sodium 4-hydroxy-2-methylenebutanoate (SHMB). SHMB is obtained saponification α-methylene-γ-butyrolactone (MBL) which a renewable monomer from tulips. Radical polymerization studied for the first time. The extent side products through ring closure depended on pH used during polymerization. Reactivity ratios were estimated. Prepared various composition investigated their swelling, mechanical and...

Well‐defined poly(methyl methacrylate) (PMMA) and acrylate) (PMA) are prepared via photochemically induced atom transfer radical polymerization (photoATRP) using ppm amounts of CuBr 2 / tris (2‐pyridylmethyl)amine [2‐(dimethylamino)ethyl]amine catalyst complexes, respectively, without degassing mixture with no need to introduce an external reducing agent the system. The effect ligand ratio on kinetic induction period during MMA MA is investigated. influenced also by amount oxygen in Both...

Carbonyl iron (CI) particles were grafted with poly(glycidyl methacrylate) (PGMA) using atom transfer radical polymerization suitable cytotoxicity and improved anticorrosion stability.

Abstract L,L ‐lactide (LA) and ε ‐caprolactone (CL) block copolymers have been prepared by initiating the poly( ‐caprolactone) (PCL) growth with living ‐lactide) (PLA*). In previous attempts to prepare this way only random copolyesters were obtained because PLA* + CL cross‐propagation rate was lower than that of PLA–CL* PLA transesterification. The present paper shows application Al‐alkoxide active centers bear bulky diphenolate ligands results in efficient suppression Thus, corresponding...

Graphene is a new and hot research topic due to properties previously not observed on the nanoscale. These make graphene promising candidate for devices. However, soluble, this property limits its processability. Therefore, chemical functionalization needed. This short review summarizes covalent reactions that have been performed individual sheets – production of oxide with subsequent transformation graphene, modification functional groups surface chemistry aromatic rings sheets. Keywords:...

A photoactuating nanocomposite was prepared by the in situ grafting of carbon nanotubes with PBA-b-PMMA diblock copolymer during synthesis linear triblock poly(methyl methacrylate)-b-poly(n-butyl acrylate)-b-poly(methyl methacrylate) (PMMA-b-PBA-b-PMMA). Control over molecular characteristics block copolymers achieved applying atom transfer radical polymerization. This synthetic approach allowed for excellent dispersion and distribution within polymer matrix. The final containing 1 wt %...

Unique grafting of the poly(glycidyl methacrylate) from surface graphene oxide (GO) with controllable reduction GO particles was performed in a single-step reaction using atom transfer radical polymerization technique. The control and modification can be achieved by appropriate selection ratio between tertiary amine particle contents. Finely tuned electrical conductivity GO-PGMA enables simple tailoring electro-responsive properties their silicone oil suspensions.