Polymerization of Poly(ε-caprolactone) Using Yttrium Triflate
نویسندگان
چکیده
منابع مشابه
Yttrium Amidate Complexes: Fundamental Reactivity and Applications in Catalysis and Polymerization
Rare-earth complexes are attractive catalyst systems due to their low cost, low toxicity and high reactivity. Modular ligand sets are ideal for complex formation since the steric and electronic properties of the resultant metal complexes can be easily varied. This thesis explores the structure and reactivity of new yttrium amidate complexes, which combine the highly reactive metal with the modu...
متن کاملKinetics and Mechanism of 6-caprolactone Anionic Polymerization under the Influence of Amines
The identity of the c-caprolactone products from polymerization under the influence of amines has been studied, and conclusion about alkyl oxygen fission of the lactone ring at polymerization has been made. The main kinetic features of polymerization and molecular-weight distribution change on forming poly-C-caprolactone are discussed. On the basis of these data, polymerization mechanisms for l...
متن کاملRing-opening polymerization of ε-caprolactone by lithium piperazinyl-aminephenolate complexes: synthesis, characterization and kinetic studies.
A series of lithium complexes were prepared from 2(N-piperazinyl-N'-methyl)-2-methylene-4-R'-6-R-phenols ([ONN](RR')) and characterized through elemental analysis, (1)H and (13)C{(1)H} NMR spectroscopy, and X-ray crystallography. Treatment of the ligands with n-butyllithium afforded {Li[ONN](RR')}(3) [R = Me, R' = (t)Bu, (1); R = R' = (t)Bu (2); R = R' = (t)Am, (3), (t)Am = C(CH(3))(2)CH(2)CH(3...
متن کاملTetraphenolate niobium and tantalum complexes for the ring opening polymerization of ε-caprolactone.
Reaction of the pro-ligand α,α,α',α'-tetra(3,5-di-tert-butyl-2-hydroxyphenyl-p-)xylene-para-tetraphenol (p-L(1)H4) with two equivalents of [NbCl5] in refluxing toluene afforded, after work-up, the complex {[NbCl3(NCMe)]2(μ-p-L(1))}·6MeCN (1·6MeCN). When the reaction was conducted in the presence of excess ethanol, the orange complex {[NbCl2(OEt)(NCMe)]2(μ-p-L(1))}·3½MeCN·0.614toluene (2·3½MeCN·...
متن کاملPreparation of single-site tin(IV) compounds and their use in the polymerization of ε-caprolactone
Butyltin(IV) carboxylate compounds were obtained by reactions of butyltrichlorotin(IV) with potassium pivalate, perfluoroheptanoate, methacrylate, 2,6-pyridinedicarboxylate, and phthalate. The synthesized complexes were fully characterized by nuclear magnetic resonance (1H-, 13C-NMR), Fourier transform infrared (FTIR), mass spectroscopies (MS) and elemental analysis. These tin complexes were us...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Polymer Journal
سال: 2003
ISSN: 0032-3896,1349-0540
DOI: 10.1295/polymj.35.422