Green polymer chemistry: synthesis of symmetric and asymmetric telechelic ethylene glycol oligomers

2015 ◽  
Vol 6 (7) ◽  
pp. 1137-1142 ◽  
Author(s):  
Marcela Castano ◽  
Kwang Su Seo ◽  
Kai Guo ◽  
Matthew L. Becker ◽  
Chrys Wesdemiotis ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Polymer Chemistry ◽  
Kinetic Investigation ◽  
Group Structures ◽  
Green Polymer ◽  
Glycol Oligomers ◽  
End Group

Kinetic investigation of the enzyme-catalyzed polycondensation of divinyl adipate and TEG led to the optimization of end group structures (vinyl V and OH O).

Green Polymer Chemistry VIII: Synthesis of Halo-ester-Functionalized Poly(ethylene glycol)s via Enzymatic Catalysis

2013 ◽  
Vol 34 (17) ◽  
pp. 1375-1380 ◽  
Author(s):  
Marcela Castano ◽  
Kwang Su Seo ◽  
Eun Hye Kim ◽  
Matthew L. Becker ◽  
Judit E. Puskas
Keyword(s):  
Ethylene Glycol ◽  
Enzymatic Catalysis ◽  
Polymer Chemistry ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Green Polymer

Melt Polycondensation and Analysis of Hydroxyl-Terminated Poly(L-lactic Acid) Using Small Molecular Diols as Terminating Agents

2013 ◽  
Vol 328 ◽  
pp. 890-894
Author(s):  
Jing Che ◽  
Rong Jie Yang
Keyword(s):  
Lactic Acid ◽  
Ethylene Glycol ◽  
Gel Permeation Chromatography ◽  
Catalyst System ◽  
Molecular Weights ◽  
H Nmr ◽  
Melt Polycondensation ◽  
Direct Melt Polycondensation ◽  
Group Structures ◽  
End Group

The synthesis of hydroxyl-terminated poly (L-lactic acid) (PLLA) by direct melt polycondensation of L-lactic acid and use of small molecular diols as terminating agents was investigated. L-lactic acid was dewatered to prepare the dehydrated prepolymer at first. Then PLLA was prepared through melt polycondensation in a melt with catalyst system including TSA, SnCl2and Sn (Oct)2. Finally, ethylene glycol, 1,4-butanediol, and 1,8-octanediol, respectively, were used in hydroxyl termination of the PLLA. The molecular weights and end-group structures of all products were characterized by gel permeation chromatography (GPC) and1H-NMR. DSC and Disc Polarimeter were used to characterize crystallinity and racemization, respectively. The results show that two kinds of hydroxyl-terminated PLLA polymers were obtained: complete hydroxyl-terminated PLLA prepared by using ethylene glycol or 1,4-butanediol, incomplete hydroxyl-terminated PLLA prepared by using 1,8-octanediol or combination of two kinds of diols. Combination of ethylene glycol or 1,4-butanediol with 1,8-octanediol can reach high hydroxyl termination of PLLA, and maintain the molecular weight by decrease of alcoholysis at the same time.1H-NMR was found as an effective estimating way for extents of reactions. The hydroxyl-terminating reactions of PLLA by the diols reduced the crystallinity and resulted in racemization to some extent.

scholarly journals End group functionalization of poly(ethylene glycol) with phenolphthalein: towards star-shaped polymers based on supramolecular interactions

2014 ◽  
Vol 10 ◽  
pp. 2263-2269 ◽  
Author(s):  
Carolin Fleischmann ◽  
Hendrik Wöhlk ◽  
Helmut Ritter
Keyword(s):  
Ethylene Glycol ◽  
Cycloaddition Reaction ◽  
Supramolecular Interactions ◽  
Poly Ethylene Glycol ◽  
Naked Eye ◽  
Vis Spectroscopy ◽  
End Group Functionalization ◽  
Interesting Approach ◽  
Poly Ethylene ◽  
End Group

The synthesis of a new phenolphthalein azide derivative, which can be easily utilized in polymer analogous reactions, is presented. The subsequent cycloaddition reaction with propargyl-functionalized methoxypoly(ethylene glycol) yielded polymers bearing phenolphthalein as the covalently attached end group. In presence of per-β-cyclodextrin-dipentaerythritol, the formation of stable inclusion complexes was observed, representing an interesting approach towards the formation of star shaped polymers. The decolorization of a basic polymer solution caused by the complexation was of great advantage since this behavior enabled following the complex formation by UV–vis spectroscopy and even the naked eye.

scholarly journals Polymerization of Ethylene Glycol Dimethacrylate (EGDM), Using An Algerian Clay as Eco-catalyst (Maghnite-H+ and Maghnite-Na+)

2020 ◽  
Vol 15 (1) ◽  
pp. 221-230 ◽  
Author(s):  
Sara Haoue ◽  
Hodhaifa Derdar ◽  
Mohammed Belbachir ◽  
Amine Harrane
Keyword(s):  
Ethylene Glycol ◽  
Exchange Process ◽  
Ethylene Glycol Dimethacrylate ◽  
Glycol Dimethacrylate ◽  
Green Catalyst ◽  
Ion Exchange Process ◽  
Ft Ir ◽  
Uv Visible ◽  
Thermal Stability Of ◽  
End Group

In this paper we have explored a novel and green method to synthesis and polymerize ethylene glycol dimethacrylate (EGDM). This technique consists on using Maghnite (Algerian clay) as a green catalyst to replace toxic catalysts. The Algerian clay has been modified using two ion exchange process to obtain Maghnite-H+ (proton exchanged process) and Maghnite-Na+ (sodium exchanged process). Synthesis experiments of EGDM and Poly (EGDM) are performed in bulk respecting the principles of green chemistry. The structure of the obtained monomer and the obtained polymer was confirmed by FT-IR, 1H-NMR and 13C-NMR, where the methacrylate end groups are clearly visible. The presence of unsaturated end group in the structure of monomer was confirmed by UV-Visible analysis. Thermogravimetric analysis (TGA) was used to study the thermal stability of these obtained products. Copyright © 2020 BCREC Group. All rights reserved 

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