English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Synthesis of well-defined multigraft copolymers by a two-step living radical polymerization with nitroxyl-functionalized poly(methyl methacrylate)

Hua, F. J., Liu, B., Hu, C. P., & Yang, Y. L. (2002). Synthesis of well-defined multigraft copolymers by a two-step living radical polymerization with nitroxyl-functionalized poly(methyl methacrylate). Journal of Polymer Science Part A-Polymer Chemistry, 40(11), 1876-1884.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Hua, F. J.1, Author           
Liu, B., Author
Hu, C. P., Author
Yang, Y. L., Author
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

Content

show
hide
Free keywords: living polymerization; graft copolymers; synthesis; kinetics (polym.)
 Abstract: Novel multigraft copolymers of poly(methyl methaerylate-graft- polystyrene) (PMMA-g-PS) in which the number of graft PS side chains was varied were prepared by a subsequent two-step living radical copolymerization approach. A polymerizable 4- vinylbezenyl 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) monomer (STEMPO), which functioned as both a monomer and a radical trapper, was placed in a low-temperature atom transfer radical polymerization (60degreesC) process of methyl methacrylate with ethyl 2-bromopronionate (EPNBr) as an initiator to gain ethyl pronionate-capped prepolymers with TEMPO moieties, PMMA-STEMPOs. The number of TEMPO moieties grafted on the PMMA backbone could be designed by varying STEMPO/EPNBr, for example, the ratios of 1/2, 2/3, or 3/4 gained one, two, or three graft TEMPO moieties, respectively. The resulting prepolymers either as a macromolecular initiator or a trapper copolymerized with styrene in the control of stable free-radical polymerization at an elevated temperature (120 degreesC), producing the corresponding multigraft copolymers, PMMA-g-PSs. The nitroxyl-functionalized PMMA prepolymers produced a relatively high initiation efficiency (>0.8) as a result of the stereohindrance and slow diffusion of TEMPO moieties connected on the long PMMA backbone. The polymerization kinetics in two processes showed a living radical polymerization characteristic. The molecular structures of these prepolymers and graft copolymers were well characterized by combining Fourier transform infrared spectroscopy, gel permeation chromatography, chemical element analysis, and H-1 NMR. (C) 2002 Wiley Periodicals, Inc.

Details

show
hide
Language(s): eng - English
 Dates: 2002-06-01
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28496
ISI: 000175550700023
Other: P-02-180
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Polymer Science Part A-Polymer Chemistry
  Alternative Title : J. Polym. Sci. Pol. Chem.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 40 (11) Sequence Number: - Start / End Page: 1876 - 1884 Identifier: ISSN: 0887-624X