Issue 7, 2012

Reactive triblock polymers from tandem ring-opening polymerization for nanostructured vinyl thermosets

Abstract

Multiply functional hydroxyl telechelic poly(cyclooctene-s-5-norbornene-2-methylene methacrylate) was synthesized by ring opening metathesis (co)polymerization of cis-cyclooctene and 5-norbornene-2-methylene methacrylate using the second generation Grubbs catalyst in combination with a symmetric chain transfer agent bearing hydroxyl functionality. The resulting hydroxyl-telechelic polymer was used as a macroinitiator for the ring opening transesterification polymerization of d,l-lactide to form reactive poly(lactide)-b-poly(cyclooctene-s-5-norbornene-2-methylene methacrylate)-b-poly(lactide) triblock polymers. Subsequently, the triblocks were crosslinked by free radical copolymerization with several vinyl monomers including styrene, divinylbenzene, methyl methacrylate, and ethyleneglycol dimethacrylate. Certain conditions led to optically transparent thermosets with mesoscale phase separation as evidenced by small angle X-ray scattering, differential scanning calorimetry and transmission electron microscopy. Disordered, bicontinuous structures with nanoscopic domains were generated in several cases, rendering the samples attractive for size-selective membrane applications.

Graphical abstract: Reactive triblock polymers from tandem ring-opening polymerization for nanostructured vinyl thermosets

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep 2011
Accepted
27 Oct 2011
First published
14 Nov 2011

Polym. Chem., 2012,3, 1827-1837

Reactive triblock polymers from tandem ring-opening polymerization for nanostructured vinyl thermosets

M. A. Amendt, L. M. Pitet, S. Moench and M. A. Hillmyer, Polym. Chem., 2012, 3, 1827 DOI: 10.1039/C1PY00450F

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