scholarly journals Ring-opening polymerization of ethylene carbonate: comprehensive structural elucidation by 1D & 2D-NMR techniques, and selectivity analysis

RSC Advances ◽  
2017 ◽  
Vol 7 (19) ◽  
pp. 11786-11795 ◽  
Author(s):  
Rubina Abdul-Karim ◽  
Abdul Hameed ◽  
Muhammad Imran Malik
Keyword(s):  
Ring Opening ◽  
Ethylene Carbonate ◽  
2D Nmr ◽  
Ring Opening Polymerization ◽  
Structural Elucidation ◽  
Nmr Techniques ◽  
Poly Ethylene

Meticulous structural elucidation and selectivity analysis of poly(ethylene ether carbonate) by multi-dimensional NMR.

Biodegradable copolymers based on poly(ethylene oxide), polylactide and polydepsipeptide sequences with functional groups

e-Polymers ◽  
2001 ◽  
Vol 1 (1) ◽  
Author(s):  
Yakai Feng ◽  
Doris Klee ◽  
Hartwig Höcker
Keyword(s):  
Block Copolymers ◽  
Ethylene Oxide ◽  
Aspartic Acid ◽  
Functional Groups ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Biodegradable Copolymers ◽  
Protective Groups ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

AbstractFor the purpose of increasing the hydrophilicity of polylactide, new block copolymers with protected functional groups, poly(lactide-co-(S)-b-benzyl aspartate)-poly(ethylene oxide)-poly(lactide-co-(S)- b-benzyl aspartate), were synthesized via ring-opening polymerization of D,L-lactide and (3S, 6R,S)-3- [(benzyloxycarbonyl)methyl]-6-methylmorpholine-2,5-dione in the presence of hydroxyltelechelic poly(ethylene oxide) (PEO) as an initiator at 140 °C for 24 h. The benzyl protective groups of the block copolymers were completely removed to give poly(lactide-co-(S)-aspartic acid)-PEO-poly(lactide-co-(S)-aspartic acid), (poly(DLLA-co-Asp)-b-PEO-b-poly(DLLA-co-Asp)). This shows lower crystallization and melting temperature compared with the polymers before deprotection. Poly(DLLA-co-Asp)-b-PEO-b-poly(DLLA-co-Asp) with 55.6 wt.-% of PEO is more hydrophilic, shows higher water absorption and is degraded faster than with 39.5 wt.-% of PEO.

scholarly journals Cyclohexyl-substituted poly(phosphonate)-copolymers with adjustable glass transition temperatures

2016 ◽  
Vol 7 (17) ◽  
pp. 2934-2937 ◽  
Author(s):  
Thomas Wolf ◽  
Johannes Naß ◽  
Frederik R. Wurm
Keyword(s):  
Glass Transition ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Anionic Ring ◽  
Poly Ethylene

2-Cyclohexyl-2-oxo-1,3,2-dioxaphospholane (cyHexPPn), a new monomer for the anionic ring-opening polymerization to poly(ethylene alkyl phosphonate)s is presented.

Polysarcosine: The Best Alternative of Poly (Ethylene Glycol)

2020 ◽  
Vol 04 ◽  
Author(s):  
Manu Singhai ◽  
Sankha Bhattacharya
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Protein Delivery ◽  
Ring Opening ◽  
Biomedical Applications ◽  
High Vacuum ◽  
Ring Opening Polymerization ◽  
Poly Ethylene Glycol ◽  
Biologically Relevant ◽  
Poly Ethylene

Abstract:: Polysarcosine (psar) is a non-ionic hydrophilic polypeptoid with numerous biologically relevant properties. Polysarcosine is poly (n-methylated glycine) and has been reported first by wesley and co-workers in the 1920s. Polysarcosine was first synthesized via ring-opening polymerization (rop) of sarcosine n-carboxyanhydride, using high-vacuum techniques. Overall, findings highlight the potential of poly(sarcosine) as an alternative corona-forming polymer to poly (ethylene glycol)-based analogues of (polymerization-induced self-assembly) pisa assemblies for use in various pharmaceutical and biomedical applications. Numerous studies suggested that such polypeptoids hold enormous potential for many biomedical applications, including protein delivery, colloidal stabilization, and nanomedicine.

Sign in / Sign up

Export Citation Format

Share Document