The synthesis and characterization of a series of 8-quinolinolato gallium complexes is presented, and the complexes are analogous to a series of aluminum complexes previously reported. The complexes have been shown to be active initiators for the ring-opening polymerization of rac-lactide. High degrees of polymerization control are demonstrated, as exemplified by the linear evolution of molecul...

Electrochemically mediated atom transfer radical polymerization (eATRP) of styrene was studied in detail by using CuBr2/TPMA (TPMA = tris(2-pyridylmethyl)amine) as a catalyst. Redox properties various Cu(II) species were investigated CH3CN, dimethylformamide (DMF), and dimethyl sulfoxide (DMSO) both the absence presence 50% (v/v) styrene. This investigation together with preliminary eATRP exper...

We couple UV−vis and FT−NIR spectroscopy for the real-time monitoring of polymerization reactions, allowing the simultaneous tracking of the rates of light absorption and initiator/monomer consumption, from which dynamic and previously difficult-to-measure parameters are calculated: quantum yields of initiator consumption, initiation and polymerization, photosensitivity, and residual content of...

Patterned coatings based on biodegradable crosslinked poly(ester/carbonate) have been prepared by photo-induced ring-opening polymerization of a liquid bifunctional trimethylene carbonate-based monomer using poly(ε-caprolactone) triol as initiator and guanidine superbase photogenerator activated irradiation at 385 nm. The influence various parameters gel time such components molar ratios, or re...

Polyaniline (PANI) nanocomposite has been successfully prepared in aqueousmedia by the chemical polymerization of aniline with ammonium peroxydisulphateas an initiator in the presence of a steric stabilizer such as sodium dodecylbenzenesulfonate(DBSNa), Poly(vinyl pyrrolidone) (PVP), poly(vinyl alcohol)(PVA), poly(ethylene glycol) (PEG) and hydroxypropylcellulose (HPC). Thechemical structure, m...

and the inability to tune the size of the features independent of the mold. Here, we seek to employ soft lithography to develop robust chemically bound coatings with microscale surface features of tunable heights. This paper describes the combination of soft lithographic molding and a surfaceinitiated polymerization (SIP) to produce a versatile process termed micromolding surface-initiated poly...

Abstract A series of cationic tungsten sulfido alkylidene N ‐heterocyclic carbene (NHC) complexes ( W01 – W09 ) the general formula [W(S)(CHCMe 3 )(X)(NHC)(CMe CN) + B(Ar F 4 − ] (NHC = 1,3‐dimesitylimidazol‐2‐ylidene, IMes; 1,3‐dimesityl‐4,5‐dichloroimidazol‐2‐ylidene, IMesCl 2 ; 1,3‐bis(2,6‐xdiisopropyl)phenyl)imidazol‐2‐ylidene, IDipp; X Cl, C 6 5 O, 2,6‐Ph ‐C H tetrakis(3,5‐bis(trifluoromet...

Ring-opening polymerization (ROP) of ethylene carbonate (EC) is associated with the emission of carbon dioxide during polymerization, which results in polymer chains containing ether linkages besides targeted carbonate linkages. In this study, ethylene carbonate is polymerized by ring-opening polymerization in the presence of sodium stannate trihydrate as a heterogeneous transesterification cat...

This study explored the kinetics of ultraviolet (UV) laser photoinitiated polymerization in thick polymer systems to achieve improved polymerization efficiency and uniformity. The modeling system comprised an incident UV laser and its reflecting beam, which was focused by a concave mirror to compensate for the exponential decay in the absorbing medium. The polymerization kinetic equation was nu...