Journal
MACROMOLECULES
Volume 42, Issue 11, Pages 3674-3680Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma900368a
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Funding
- National Science Foundation [DMR-0605880]
- NSF through NNIN program
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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ABA triblock copolymers were synthesized by combining ring-opening metathesis polymerization (ROMP) of 1,5-cyclooctadiene (COD) with ring-opening polymerization of D,L-lactide. Hydroxyl-functionalized telechelic polyCOD was prepared by taking advantage of chain transfer during ROMP of COD using the acyclic chain transfer agent cis-1,4-diacetoxy-2-butene. These hydroxy-terminated macroinitiators were used as initiators for the polymerization of lactide to form a series of triblock copolymers with compositions in the range 0.24 <= f(PLA) <= 0.89 and molecular weights ranging from 22 to 196 kg mol(-1). The ordered-state morphologies of the triblocks were determined using small-angle X-ray scattering; well-ordered microstructures were observed for several samples, in accordance with the predicted dependence of morphology on composition. The mechanical properties of these materials were also investigated by performing tensile measurements; the triblocks were considerably tougher than poly(D,L-lactide), most markedly in samples with low polyCOD midblock content.
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