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TRIBLOCK COPOLYMERS polylactide - b - polydimethylsiloxane - b -polylactide ( PLA - PDMS - PLA )

Nanoporous Materials From Polylactide-Containing ABA Triblock Copolymers Marc A. Hillmyer (University of Minnesota) DMR 0605880. TRIBLOCK COPOLYMERS polylactide - b - polydimethylsiloxane - b -polylactide ( PLA - PDMS - PLA ) and

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TRIBLOCK COPOLYMERS polylactide - b - polydimethylsiloxane - b -polylactide ( PLA - PDMS - PLA )

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  1. Nanoporous Materials FromPolylactide-Containing ABA Triblock CopolymersMarc A. Hillmyer (University of Minnesota) DMR 0605880 TRIBLOCK COPOLYMERS polylactide-b-polydimethylsiloxane-b-polylactide (PLA-PDMS-PLA) and polylactide-b-polyethylene-b-polylactide (PLA-HDPE-PLA) Nanoporous polymeric materials are employed in several industrially important research arenas including ultrafiltration and nanolithography. Based on their well-established self-organizing behavior and the ability to incorporate chemically-etchable segments (such as polylactide), block copolymers represent ideal precursors to nanoporous polymers. We have prepared a variety of new ABA triblock copolymers with midblock (B) segments chosen specifically for their mechanical property and reactivity profiles. For example, high-density polyethylene (HDPE) exhibits excellent chemical resistance and mechanical strength, both useful for membrane applications, and polydimethylsiloxane (PDMS) can be converted to silicon dioxide by reactive ion etching, a feature useful for nanolithography. Nanoporous materials can be generated upon etching the polylactide domains from these nanostructured materials, and we are exploring the utility of such structures for technologically important applications in water purification and high density storage media. 2D SAXS of two PLA-HDPE-PLA samples (A) Lamellar and (B) Cylindrical Crosslinking of HDPE in PLA-HDPE-PLA triblocks preserves the morphology and subsequent PLA removal generates nanoporosity.

  2. Hillmyer Group Outreach ActivitiesMarc A. Hillmyer (University of Minnesota) DMR 0605880 The PI participated in the following education and outreach activities since the beginning of 2008. (1) The PI gave a green polymer presentation and lab tour for North High School students for the BRIDGE (Building Resources and Innovative Design for Global Energy) project of the National Society of Black Engineers (w/ Carolyn Wanamaker) - See images to the left. (2) The PI hosted Lindsay Lowther from Arlington High School (St. Paul, Minnesota) in Hillmyer labs (working with Carolyn Wanamaker) as part of the Summer Institute at the University of Minnesota. In this program high school teachers gain some research experience and come away thinking, “I have a better idea of what people are doing in science now.”

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