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- Title
Polypropylene- block-poly(methyl methacrylate) and- block-poly( N-isopropylacrylamide) block copolymers prepared by controlled radical polymerization with polypropylene macroinitiator.
- Authors
Kaneko, H.; Matsugi, T.; Kawahara, N.; Matsuo, S.; Kojoh, Shin-ichi; Kashiwa, N.
- Abstract
Polypropylene- block-poly(methyl methacrylate) (PP- b-PMMA) and Polypropylene- block-poly( N-isopropylacryramide) (PP- b-PNIPAAm) block copolymers were successfully synthesized by radical polymerizations of MMA or NIPAAm with polypropylene (PP) macroinitiators. Polypropylene macroinitiators were prepared by a series of end functionalization of pyrolysis PP via hydroalumination, oxidation and esterification reactions. The PP macroinitiators thus obtained could initiate radical polymerizations of MMA or NIPAAm by using transition metal catalyst systems, and 1H NMR analysis and gel permeation chromatography measurement confirmed the formation of PP- b-PMMA and PP- b-PNIPAAm block copolymers. In addition, the length of the incorporated PMMA or PNIPAAm segments in these block copolymers was controllable by the feed ratio between the monomer and the PP macroinitiator, and their molecular weights were estimated to be 35700 and 68700 (PMMA) and 1760 and 13300 (PNIPAAm), respectively. Transmission electron microscopy of the polymers obtained by NIPAAm polymerization revealed specific morphological features that reflected the difference of PNIPAAm segment length.
- Subjects
POLYPROPYLENE; METHYL methacrylate; COPOLYMERS; POLYMERIZATION; METAL catalysts; PYROLYSIS
- Publication
Kinetics & Catalysis, 2006, Vol 47, Issue 2, p227
- ISSN
0023-1584
- Publication type
Article
- DOI
10.1134/S002315840602011X