CARBON NANOTUBE-GRAFT-BLOCK COPOLYMERS CONTAINING SILVER NANOPARTICLES

Polycaprolactone-polylactide block copolymers (PCL-block-PLA) were grafted onto filled multi-wall carbon nanotubes (MWCNT) successfully. In this synthesis, MWCNTs were opened and functionalized, and then they were filled by silver nanoparticles. The filled MWCNT were used as macroinitiator for ring opening polymerization of ε-caprolactone and L-lactide. Then the end hydroxyl functional groups of MWCNT-graft-PCL or MWCNT-graft-PLA were used as initiator for ring opening polymerization of lactide and ε-caprolactone and MWCNT-graft-PCL-block-PLA or MWCNT-graft-PLA-block-PCL were obtained, respectively. Length of grafted copolymer chains onto the MWCNT was controlled using CNT/monomer ratio. Nanocomposites' properties depend on the length of polymer blocks strongly. Structure of nanocomposites was evaluated by TEM and spectroscopy methods.

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

e-Polymers ◽

10.1515/epoly.2001.1.1.4 ◽

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.

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Carbon Nanotubes Containing Metal Nanoparticles-Graft-Hyperbranched Polyglycerols Nanocomposites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.360 ◽

2011 ◽

Vol 284-286 ◽

pp. 360-364

Author(s):

Jing Zhu ◽

Yang Liu ◽

Juan He ◽

Hong Liang Wei ◽

Hui Juan Chu

Keyword(s):

Carbon Nanotubes ◽

Silver Nanoparticles ◽

Metal Nanoparticles ◽

Potential Application ◽

Ring Opening ◽

Multiwall Carbon Nanotubes ◽

Ring Opening Polymerization ◽

Water Soluble ◽

Multiwall Carbon

New water soluble multiwall carbon nanotubes (MWCNTs) containing silver nanoparticles-grafted-hyperbranched polyglycerols (HPG) nanocomposites were synthesized and characterized successfully. In this work, MWCNTs were opened using HNO3/H2SO4mixture and filled by metal nanoparticles such as silver nanoparticles through wet chemcial method. Then MWCNTs containing silver nanoparticles (MWCNTs(Ag)) were used as macroinitiator for ring opening polymerization of glycidol and MWCNTs(Ag)-g-HPG nanocomposites were obtained. Structure of nanocomposites was evaluated by TEM, TGA and spectroscopy methods. With the solubility of MWCNTs(Ag)-g-HPG greatly improved, the new nanocomposites exhibit potential application in biomedicine and nanomedicine.

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Synthesis of polycaprolactone-polyimide-polycaprolactone triblock copolymers via a 2-step sequential copolymerization and their application as carbon nanotube dispersants

Polymer Chemistry ◽

10.1039/c6py01933a ◽

2017 ◽

Vol 8 (4) ◽

pp. 674-681 ◽

Cited By ~ 10

Author(s):

Chengyin Liu ◽

Bo Liu ◽

Mary B. Chan-Park

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Ring Opening ◽

Triblock Copolymers ◽

Single Walled Carbon Nanotubes ◽

Ring Opening Polymerization ◽

Single Walled Carbon ◽

Walled Carbon Nanotubes

Triblock copolymers of polycaprolactone-polyimide-polycaprolactone (PCL-PI-PCL) were synthesized via polycondensation followed by ring-opening polymerization and used as single-walled carbon nanotubes (SWNTs) dispersants.

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