Structurally rigid bis(pyrazolyl)pyridine Zn(II) and Cu(II) complexes: Structures and kinetic studies in ring-opening polymerization of ε-caprolactone

2016 ◽  
Vol 31 (2) ◽  
pp. e3556 ◽  
Author(s):  
Mnqobi Zikode ◽  
Stephen O. Ojwach ◽  
Matthew P. Akerman
Keyword(s):  
Ring Opening ◽  
Kinetic Studies ◽  
Ring Opening Polymerization

Accelerated living cationic ring-opening polymerization of a methyl ester functionalized 2-oxazoline monomer

2015 ◽  
Vol 6 (4) ◽  
pp. 514-518 ◽  
Author(s):  
Petra J. M. Bouten ◽  
Dietmar Hertsen ◽  
Maarten Vergaelen ◽  
Bryn D. Monnery ◽  
Marcel A. Boerman ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Ring Opening ◽  
Kinetic Studies ◽  
Ring Opening Polymerization ◽  
Cationic Ring Opening Polymerization

Kinetic studies on the homo- and copolymerization of 2-methoxycarboxyethyl-2-oxazoline with 2-methyl-2-oxazoline and 2-ethyl-2-oxazoline is discussed.

Structural and kinetic studies of the ring-opening polymerization of cyclic esters using N,N′ diarylformamidines Zn(II) complexes

Polyhedron ◽  
2016 ◽  
Vol 110 ◽  
pp. 63-72 ◽  
Author(s):  
Ekemini D. Akpan ◽  
Stephen O. Ojwach ◽  
Bernard Omondi ◽  
Vincent O. Nyamori
Keyword(s):  
Ring Opening ◽  
Kinetic Studies ◽  
Ring Opening Polymerization ◽  
Cyclic Esters

scholarly journals Pentamethylcyclopentadienyl Molybdenum(V) Complexes Derived from Iodoanilines: Synthesis, Structure, and ROP of ε-Caprolactone

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1554
Author(s):  
Tian Xing ◽  
Mark R. J. Elsegood ◽  
Sophie H. Dale ◽  
Carl Redshaw
Keyword(s):  
Molecular Weight ◽  
Comparative Studies ◽  
Ring Opening ◽  
Kinetic Studies ◽  
Ring Opening Polymerization ◽  
Molecular Structures ◽  
Low Molecular Weight ◽  
End Groups ◽  
Amine Complex ◽  
Reaction Stoichiometry

The reaction of [Mo(η-C5Me5)Cl4] with the ortho-, meta-, or para-iodo-functionalized anilines 2-IC6H4NH2, 3-IC6H4NH2, 4-IC6H4NH2 yields imido or amine products of the type [Mo(η-C5Me5)Cl2(IC6H4N)] (2-I, 1, 3-I, 3, 4-I, 5) or [Mo(η-C5Me5)Cl4(IC6H4NH2)] (3-I, 2, 4-I, 4), respectively, depending on the reaction stoichiometry/conditions; we were unable to isolate an amine complex of the 2-I derivative. The reaction of [Mo(η-C5Me5)Cl4] with one equivalent of 2-I,4-FC6H3NH2 in the presence of Et3N afforded [Mo(η-C5Me5)Cl2(2-I,4-FC6H3N)]·MeCN (6·MeCN), which, upon exposure to air, afforded the Mo(VI) imido complex [Mo(η-C5Me5)Cl3(2-I,4-FC6H3N)] (7). For comparative studies, the structure of the aniline (C6H5NH2)-derived complex [Mo(η-C5Me5)Cl2(2-C6H3N)] (8) has also been prepared. The molecular structures of 1–8 have been determined and reveal packing in the form of zig-zag chains or ladders. The complexes catalyze, in the presence of benzyl alcohol under N2, the ring-opening polymerization (ROP) of ε-caprolactone affording relatively low molecular weight products. The MALDI-ToF spectra indicate that a number of polymer series bearing a variety of end groups are formed. Conducting the ROPs as melts or under air results in the isolation of higher molecular weight products, again bearing a variety of end groups. Kinetic studies reveal the aniline-derived imido complex 8 performs best, whilst a meta-iodo substituent and a Mo(V) centre are also found to be beneficial. The structures of the side products 2-IC6H4NH3Cl and 3-IC6H4NH3Cl are also reported.

scholarly journals Chiral 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD)-Catalyzed Stereoselective Ring-Opening Polymerization of rac-Lactide: High Reactivity for Isotactic Enriched Polylactides (PLAs)

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2365 ◽  
Author(s):  
Qaiser Mahmood ◽  
Guangqiang Xu ◽  
Li Zhou ◽  
Xuanhua Guo ◽  
Qinggang Wang
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Kinetic Studies ◽  
Monomer Conversion ◽  
Ring Opening Polymerization ◽  
High Reactivity ◽  
Chiral Hplc ◽  
Nmr Spectrum ◽  
Molecular Weight Distributions ◽  
A Chain

Chiral 4,8-diphenyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (DiPh-TBD) was synthesized and applied to a ring-opening polymerization of rac-lactide (rac-LA). The chiral DiPh-TBD promoted the synthesis of isotactic enriched polylactides (PLAs) with controlled molecular weight and narrow molecular weight distributions under mild, metal-free conditions. When the [rac-LA]/[Cat.] ratio was 100/1, full monomer conversion was achieved within only 1 min and a moderate probability of 0.67 meso dyads (Pm) was obtained at room temperature. A chain-end control mechanism (CEC) was found to be responsible for the isoselectivity based on the homodecoupled 1H NMR spectrum, the chiral HPLC measurement, and kinetic studies.

scholarly journals Efficiency of liquid tin(ii) n-alkoxide initiators in the ring-opening polymerization of l-lactide: kinetic studies by non-isothermal differential scanning calorimetry

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43566-43578
Author(s):  
Montira Sriyai ◽  
Tawan Chaiwon ◽  
Robert Molloy ◽  
Puttinan Meepowpan ◽  
Winita Punyodom
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ring Opening ◽  
Kinetic Studies ◽  
Ring Opening Polymerization ◽  
Scanning Calorimetry ◽  
Homogeneous Liquid ◽  
Liquid Tin

The efficiency of homogeneous liquid tin(ii) n-alkoxide initiators in the ROP of l-lactide was reported in this work by non-isothermal DSC kinetic approaches.

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