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Showing 1 to 6 of 6 for “"Polybutadienes"”.

  1. The analysis of rocket propellants by carbon-13 NMR

    Ku, Michael Mei-kungVirginia Polytechnic Institute and State University1977

    Polybutadienes, polymerized via free radical mechanism to give an average molecular weight of 3000, were analyzed with carbon-13 NMR. The relative abundance of the three types of structural units (cis-1,4, trans-1,4, and vinylic-1,2 units) was quantitatively determined. The distribution of the …

    vt Repository record

  2. Synthesis and Characterization of Multiphase Block Copolymers: Influence of Functional Groups on Macromolecular Architecture

    Saito, TomonoriVirginia Tech2008

    Low molecular weight liquid polybutadienes (1000 – 2000 g/mol) consisting of 60 mol% 1,2-polybutadiene repeating units were synthesized via anionic telomerization and conventional anionic polymerization. Maintaining the initiation and reaction temperature less than 70 °C minimized chain transfer …

    vt Repository record

  3. Thermodynamic Interactions in Polydiene/Polyolefin Blends

    Qiu, JialinUniversity of Houston2020

    … involved in this study include a series polybutadienes (PBD) with varying amounts of 1,2 and 1,4 microstructure units and 1,4-polyisoprene (1,4-PI); the corresponding polyolefins included are poly(ethyl ethylene) (PEE), polyethylene (PE), PE-co-PEE random copolymers, and …

    houston Repository record

  4. Mechanism and Application of a Heterogeneous Catalytic Hydrogen-deuterium Exchange Reaction for Polyolefins

    Zeng, Yiming2018

    … polymers used in this study were hydrogenated polybutadienes (hPBDs), and a metallocene linear low density polyethylene (LLDPE). When mixed at 170 ºC with isooctane, Pt/Re-SiO2 catalyst, and gaseous deuterium, the polyolefins dissolve and undergo H/D exchange reaction at the surface of the …

    umn Repository record

  5. I. Ozonization studies on polybutadiene structure II. Optically active resins for chromatography

    Bluestein, Claire Sylvia KraimanUniversity of Illinois at Urbana-Champaign1950

    uiuc Repository record

  6. Polymer Melts Investigated by Field Cycling NMR Relaxometry: From Simple Liquid to Reptation Dynamics

    Herrmann, AxelUniversität Bayreuth

    … approach, the dipolar correlation function of polybutadienes (PB) melts is presented and comprises - depending on M - glassy, Rouse and entanglement dynamics. The latter two relaxation regimes can be described by different power-laws, which are compared to the predictions of the tube-reptation …

    bayreuth Repository record