Synthesis of novel types of graft copolymers by a “grafting-from” method using ring-opening polymerization of lactones and lactides

2003 ◽  
Vol 57 (2-3) ◽  
pp. 137-146 ◽  
Author(s):  
Miroslav Janata ◽  
Bohumil Masař ◽  
Luděk Toman ◽  
Petr Vlček ◽  
Petra Látalová ◽  
...  
Keyword(s):  
Ring Opening ◽  
Graft Copolymers ◽  
Ring Opening Polymerization ◽  
Grafting From

Synthesis of biodegradable protein–poly(ε-caprolactone) conjugates via enzymatic ring opening polymerization

2020 ◽  
Vol 11 (3) ◽  
pp. 682-686 ◽  
Author(s):  
Chunyang Bao ◽  
Xiaoling Xu ◽  
Jing Chen ◽  
Qiang Zhang
Keyword(s):  
Ring Opening ◽  
Graft Copolymers ◽  
Ring Opening Polymerization ◽  
Amphiphilic Graft Copolymers

Lipase–poly(HEAA) conjugates act as initiators and catalysts simultaneously for the eROP of ε-CL, forming biodegradable conjugates with amphiphilic graft copolymers.

Silk sericin as a bio-initiator for grafting from synthesis of polylactide via ring-opening polymerization

2019 ◽  
Vol 121 ◽  
pp. 109265 ◽  
Author(s):  
Kanittha Boonpavanitchakul ◽  
Suwatchai Jarussophon ◽  
Nuttaporn Pimpha ◽  
Wiyong Kangwansupamonkon ◽  
Rathanawan Magaraphan
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Silk Sericin ◽  
Grafting From

Novel Amphiphilic Star-Shaped Poly(2-Oxazoline)s with Calix[4]Arene Branching Center

2021 ◽  
Vol 899 ◽  
pp. 300-308
Author(s):  
Aleksei N. Blokhin ◽  
Alla B. Razina ◽  
Andrey V. Tenkovtsev
Keyword(s):  
Aqueous Solutions ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Ring Opening Polymerization ◽  
Arene Derivative ◽  
Vis Spectroscopy ◽  
Gel Permeation ◽  
Grafting From ◽  
Cationic Ring Opening Polymerization

Novel amphiphlic four-arm star-shaped poly (2-alkyl-2-oxazoline) s with calix [4] arene core were synthesized using the “grafting from” approach. The chlorosulfonated calix [4] arene derivative was synthesized and successfully applied as a multifunctional initiator for the cationic ring-opening polymerization of 2-alkyl-2-oxazolines. Obtained star-shaped poly (2-alkyl-2-oxazoline) s were characterized by means of NMR, UV-Vis spectroscopy and gel-permeation chromatography. It was shown that star-shaped poly (2-isopropyl-2-oxazoline) perform thermosensitivity in aqueous solutions.

scholarly journals Synthesis of graft polyrotaxane by simultaneous capping of backbone and grafting from rings of pseudo-polyrotaxane

2014 ◽  
Vol 10 ◽  
pp. 2573-2579 ◽  
Author(s):  
Kazuaki Kato ◽  
Katsunari Inoue ◽  
Masabumi Kudo ◽  
Kohzo Ito
Keyword(s):  
Polyethylene Glycol ◽  
Inclusion Complex ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Kinetic Control ◽  
Basic Catalyst ◽  
Grafting Polymerization ◽  
Grafting From ◽  
Hydroxy Groups ◽  
End Group

Graft polyrotaxanes, with poly(ε-caprolactone) (PCL) graft chains on the ring components were synthesized by the simultaneous ring-opening polymerization of ε-caprolactone from both ends of the backbone polymer, an end-functionalized polyethylene glycol (PEG) and the formation of inclusion complexes with α-cyclodextrin (α-CD). PEG with multiple functional groups at each end was prepared by the condensation of PEG-amine and D-gluconic acid; the PEG derivative formed an inclusion complex with α-CD. The polymerization of multiple hydroxy groups at the backbone ends resulted in a star-shaped end group, which served as a bulky capping group to prevent dethreading. In contrast, PEG with only one hydroxy group at each end did not produce polyrotaxanes, indicating that single PCL chains were too thin to confine α-CDs to the complex. In addition, the grafting polymerization proceeded properly only when robust hydrogen bonds formed between α-CDs were dissociated using a basic catalyst. Since the dissociation also induced dethreading, kinetic control of the polymerization and dissociation were crucial for producing graft polyrotaxanes. Consequently, this three-step reaction yielded graft polyrotaxanes in a good yield, demonstrating a significant simplification of the synthesis of graft polyrotaxanes.

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