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Dynamics in Polymeric Thin Films Frank D. Blum, University of Missouri-Rolla, DMR 0412320

silica. -50 0 KHz 50. -50 0 KHz 50. Dynamics in Polymeric Thin Films Frank D. Blum, University of Missouri-Rolla, DMR 0412320.

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Dynamics in Polymeric Thin Films Frank D. Blum, University of Missouri-Rolla, DMR 0412320

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  1. silica -50 0 KHz 50 -50 0 KHz 50 Dynamics in Polymeric Thin FilmsFrank D. Blum, University of Missouri-Rolla, DMR 0412320 Molecular mass plays important roles in polymer science and technology. For polymers adsorbed on solid surfaces, such as those used in advanced electronics, the effects of molecular mass are complicated and often unknown. Deuterium (heavy hydrogen) nuclear magnetic resonance (NMR) and other techniques have been used to probe the behavior of adsorbed polymers. On the right is a comparison of deuterium NMR spectra of poly(methyl acrylate) (PMA) in bulk (35°C) and adsorbed on silica (1.4 mg PMA/m2 silica surface, 55°C). In bulk a well known dependence of the polymer glass transition is found. Here 165 kDa and 77 kDa are glassy and 5 kDa rubbery. On silica, the material with the highest glass transition is 77 kDa. This surprising behavior is different than in bulk. - Burak Metin and Frank D. Blum, Segmental Dynamics in Poly(methyl acrylate) on Silica: Molecular-Mass Effects, J. Chem. Phys., 125, 054707-9 (2006). DOI:10.1063/1.2219739 Bulk 35 °C 165k 77k 38k 5k Surface 55°C ~1.4 mg/m2 Surface Mobility -> Molecular Mass ->

  2. Dynamics in Polymeric Thin FilmsFrank D. Blum, University of Missouri-Rolla, DMR 0412320 Outreach: The PI has mentored high school students for the last five years with assistance from NSF grants. These students include: Alyssa Packard, 2007; Adam Daly, 2007; Sarah Jackson, 2006; Steve Puzach, 2005-6; Greg Smith, 2003-4; and Madeleine Philpot, 2002. - Education: Over the duration of this grant, the following students have completed graduate degrees: Burak Metin (Ph.D. 2006), Okuom McDuff (Ph.D. Chemistry, 2005); Sunil Pillalamarri (Ph.D. Chemistry, 2005); Lea Dankers (M.S. Chemistry, 2007), Pavan Challa (M.S. Chemistry, 2005); Rakesh Nambiar (M.S. Chemistry, 2005) Ravindra Vohra (M.S. Chemical Engineering, 2005), Erin Young (M.S. Chemical Engineering, 2004) In addition, UMR graduate students Manikantan Nair, Piyawan Krisanangkura, and Jason Bohanon and Boonta Hetayothin have worked on related research.

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