The Preparation and Characterization of ABC-Shaped Star Copolymer of MPEG-PCL-PBLG

2013 ◽  
Vol 750-752 ◽  
pp. 1358-1362
Author(s):  
Dian Guang Geng ◽  
Yong Ming Chuan ◽  
Li Li Li ◽  
Ming Long Yuan
Keyword(s):  
Ring Opening ◽  
Graft Polymerization ◽  
Ring Opening Polymerization ◽  
Poly Ethylene Glycol ◽  
H Nmr ◽  
The Core ◽  
Poly Ethylene ◽  
Copolymer Poly ◽  
Star Copolymer

A novel biodegradable ABC-shaped star copolymer, poly (ethylene glycol)(PEG)-b-poly (ε-caprolactone)(PCL)-poly-c-poly (ɤ-benzyl-L-glutamic acid)(PBLG)(MPEG-PCL-PBLG), was synthesized by the graft polymerization of MPEG-NH2with the core of Boc-LYSZ-COOH and the twice ring-opening polymerization (ROP) of ε-caprolactone (CL) and N-carboxyanhydride of ɤ-benzyl-L-glutamate (BLGNCA) with centrally amino-functionalized lysine as a initiator. The ABC-shaped star copolymer and its precursors were characterized by1H NMR, GPC, and DSC-TG measurements.

Synthesis and sequence-controlled self-assembly of amphiphilic triblock copolymers based on functional poly(ethylene glycol)

2017 ◽  
Vol 8 (45) ◽  
pp. 6964-6971 ◽  
Author(s):  
Yanxin Qi ◽  
Bin Li ◽  
Yupeng Wang ◽  
Yubin Huang
Keyword(s):  
Ethylene Glycol ◽  
Self Assembly ◽  
Ring Opening ◽  
Glycidyl Ether ◽  
Ring Opening Polymerization ◽  
Poly Ethylene Glycol ◽  
Amphiphilic Triblock Copolymer ◽  
Allyl Glycidyl Ether ◽  
Poly Ethylene ◽  
Copolymer Poly

Given the increasing prosperity of multifunctional poly(ethylene glycol) (mf-PEG), an amphiphilic triblock copolymer, poly(ethylene glycol)-block-poly(ε-caprolactone)-block-poly(allyl glycidyl ether) (mPEG-PCL-PAGE), was synthesized by a combination of living ring-opening polymerization (ROP) and click chemistry.

Synthesis and characterization of methoxy poly(ethylene glycol)-b-poly(DL-lactide-co-glycolide-co-ε-caprolactone) di block copolymers: Effects of block lengths and compositions

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Yodthong Baimark ◽  
Mangkorn Srisa-ard ◽  
Jirasak Threeprom ◽  
Robert Molloy ◽  
Winita Punyodom
Keyword(s):  
Ethylene Glycol ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
Poly Ethylene Glycol ◽  
H Nmr ◽  
Random Character ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Dsc Curves

AbstractMethoxy poly(ethylene glycol)-b-poly(D,L-lactide-co-glycolide-co-ε- caprolactone) diblock copolymers, designated as MPEG-b-PDLLGCL, with different MPEG block lengths and DLL:G:CL ratios were synthesized via ring-opening polymerization in bulk using MPEG and stannous octoate as the initiating system. The diblock copolymers were characterized using a combination of FT-IR, 1HNMR, GPC and DSC. The percentage yields of the diblock copolymers were in excess of 90%. 1H-NMR analysis confirmed that the PDLLGCL blocks contained at least some random character. From their DSC curves, the diblock copolymers were amorphous in morphology. Their glass transition temperatures decreased as the MPEG block length increased and as G and CL units were incorporated.

scholarly journals Morphological Transitions of Photoresponsive Vesicles from Amphiphilic Polypeptoid Copolymers for Controlled Release

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 798
Author(s):  
Xu Yang ◽  
Zhiwei Wang ◽  
Jing Sun
Keyword(s):  
Drug Delivery ◽  
Controlled Release ◽  
Ethylene Glycol ◽  
Uv Irradiation ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Poly Ethylene Glycol ◽  
Morphological Transitions ◽  
Poly Ethylene ◽  
Copolymer Poly

Photoresponsive polymers have attracted increasing interest for a variety of applications. Here, we report a family of photoresponsive polypeptoid-based copolymer poly(ethylene glycol)-b-poly(N-(S-(o-nitrobenzyl)-thioethyl) glycine)-co-poly(N-(2-phenylethyl) glycine) (PEG-b-PNSN-co-PNPE) synthesized by the controlled ring-opening polymerization (ROP) technique. The key feature of the design is to incorporate both o-nitrobenzyl group moiety to offer the photoresponsive property and phenethyl residues to tune the structural and amphiphilic property of the system. We demonstrate that the cleavage degree of the o-nitrobenzyl group can reach to 100% upon UV-irradiation. With delicate design, a photoresponsive vesicle-to-sphere transition has been observed that facilitates the release of the encapsulants. This work provides a facile approach to prepare a type of photoresponsive polymers with tunable properties for drug delivery.

scholarly journals Synthesis and Characterization of Polyphosphazenes Modified with Hydroxyethyl Methacrylate and Lactic Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Evelyn Carolina Martínez Ceballos ◽  
Ricardo Vera Graziano ◽  
Gonzalo Martínez Barrera ◽  
Oscar Olea Mejía
Keyword(s):  
Lactic Acid ◽  
Ring Opening ◽  
Room Temperature ◽  
Block Structure ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Poly Lactic Acid ◽  
Hydroxyethyl Methacrylate ◽  
H Nmr

Poly(dichlorophosphazene) was prepared by melt ring-opening polymerization of the hexachlorocyclotriphosphazene. Poly[bis(2-hydroxyethyl-methacrylate)-phosphazene] and poly[(2-hydroxyethyl-methacrylate)-graft-poly(lactic-acid)-phosphazene] were obtained by nucleophilic condensation reactions at different concentrations of the substituents. The properties of the synthesized copolymers were assessed by FTIR,1H-NMR and31P-NMR, thermal analysis (DSC-TGA), and electron microscopy (SEM). The copolymers have a block structure and show twoTg's below room temperature. They are stable up to a temperature of 100°C. The type of the substituents attached to the PZ backbone determines the morphology of the polymers.

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