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J ACS , 2005, 127, 15481-15490 .

Complex hierarchical self-assembly templated by block copolymers Christopher Li, Drexel University, DMR-0239415.

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J ACS , 2005, 127, 15481-15490 .

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  1. Complex hierarchical self-assembly templated by block copolymersChristopher Li, Drexel University, DMR-0239415 We systematically investigated phase structures of a series of rod-coil block copolymer poly(styrene-block-(2,5-bis-[4-methoxyphenyl]oxycarbonyl)styrene) (PS-b-PMPCS). The PMPCS segments act as the rod and the PS block act as the coil. For symmetric PS-b-PMPCS, bilayer smectic A phase were observed. For asymmetric block copolymers, novel tetragonal perforated layer (TPL) structure was confirmed using TEM and SAXS techniques. The observation of the tetragonal instead of hexagonal perforation was attributed to the rod nature of one block of the macromolecules. Both random and regular tetragonal perforated structures were observed by blending PS homopolymers. Phase boundary between lamellar and TPL phase was also found to be MW dependent. JACS, 2005, 127, 15481-15490. TEM micrographs of thin sections of PS171-b-PMPCS32. The sample was sectioned along the xz (a) yz (b) and xy (c) planes followed by RuO4 staining for 30 mins. Insets show their FFT pattern. Figure on the right shows the schematic representation of the TPL phase of PS-b-PMPCS.

  2. Complex hierarchical self-assembly templated by block copolymersChristopher Li, Drexel University, DMR-0239415 Education Under this grant, two graduate students are pursuing their Ph.D. degrees: Mr. Kishore Tenneti (4nd year) and Mr. Lingyu Li (going to graduate during summer, 2006); One student, Steve Kodjie is pursuing his Master degree (summer, 2006). Three undergraduate student (Molly Stewart, Benjamin Gillespie and Jonathan Hopely) have also been supported. • Outreach • Coordinate the Drexel Summer Seed program for the department of Materials Science and Engineering at Drexel University. This program will host ~175 high school students from nearby schools. • The PI’s lab conducts demo experiments which have consistently been evaluated as the “best lab” in the entire COE. • Host one high school student in the summer for 2 weeks to conduct polymer research. • Participate a series of recruiting activities such as “Inspiring a child to dream” etc.. Polymer Slime and foams

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