Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published December 4, 2001 | Supplemental Material
Journal Article Open

Synthesis of End-Functionalized Poly(norbornene)s via Ring-Opening Metathesis Polymerization


The synthesis of a variety of poly(norbornene)s (PNB)s bearing acetoxy, hydroxy, and vinyl end groups was accomplished. PNBs with an acetoxy group at one terminus and a vinyl group at the other were prepared using norbornene, ruthenium-based olefin metathesis catalyst (PCy_3)_2Cl_2Ru═CHPh, and allyl acetate as a chain transfer agent (CTA). Employing a more active catalyst, (1,3-dimesityl-4,5-dihydroimidazol-2-ylidene)(PCy_3)Cl_2Ru═CHPh, and 1,4-diacetoxy-2-butene as the CTA afforded telechelic PNBs bearing acetoxy groups at both ends of the polymer chains. Molecular weights were controlled by varying the initial monomer/CTA ratio and were in agreement with their theoretical values. Using a similar procedure, acetoxy end-terminated PNBs were also obtained by degradation of high molecular weight PNB. Removal of the acetoxy groups afforded the corresponding hydroxy-terminated polymers with number-averaged functionalities close to two. Mechanisms are proposed for the formation of the end-functionalized polymers. Correction factors for characterizing PNBs by gel permeation chromatography (GPC) are also suggested.

Additional Information

© 2001 American Chemical Society. Received 21 May 2001. Published online 7 November 2001. Published in print 1 December 2001. C.B. gratefully acknowledges the NSF for a predoctoral fellowship. T.M. thanks the Seksui Corporation (Japan) for financial support.

Attached Files

Supplemental Material - ma010878q_s.pdf


Files (82.9 kB)
Name Size Download all
82.9 kB Preview Download

Additional details

August 19, 2023
October 26, 2023