Cross-Linkers for Improved High Temperature Performance of ROMP Adhesives
作者:Christopher G. Keck、Jonathan L. Kendall、Kenneth C. Caster
DOI:10.1002/adsc.200600455
日期:2007.1.8
observed at elevated temperature with little detrimental affect on low temperature strengths even at highcross-linker concentration. Self-bonding of polyolefins assemblies was also investigated. Addition of a peroxide radical initiator to the initial ROMP formulation and cross-linking the bonded assembly in a post-cure reaction was also found to lead to improvedhightemperature bond strength. Synthetic
Design and Synthesis of Extended π-Systems: Monomers, Oligomers, Polymers
作者:U. Scherf、K. Müllen
DOI:10.1055/s-1992-34172
日期:——
The synthesis of unconventional extended Ï-systems is described in an attempt to tailor the structures of organic compounds for specific optical and electrical properties. In order to emphasize the role of the Ï-conjugation and to correlate chemical structure and physical function both one-dimensional arylenevinylenes and two-dimensional ribbon-type molecules are considered. In the synthesis of the former the aryl-olefin coupling according to Heck is of special value, the synthesis of the latter is achieved by repetitive Diels-Alder cycloadditions and by two-step processes in which carefully designed polyaryl precursors are subjected to ring closure. Key ingredients of the present approach are the interplay of synthetic organic chemistry and synthetic macromolecular chemistry and the needs outlined by materials sciences. Thereby, transition from monomers to oligomers and polymers defines new requirements for the selectivity of the synthetic reactions and the tractability of the products. 1. Introduction 2. Oligo- and Poly(arylenevinylene)s 2.1. Structurally Defined Oligo(1,4-phenylenevinylene)s - Valuable Model Systems for Understanding Properties of the Corresponding Polymers 2.2. Oligomers and Polymers Containing the 9,10-Anthrylene Unit in the Main Chain 2.3. Unusual Redoxactive Systems via Incorporation of 1,5-Cyclooctatetraenylene Units 2.4. The 2,2′-Biphenylylene Building Block - toward the Generation of Photoreactive Poly(arylenevinylene)s 3. Ï-Systems with Ribbon- or Ladder-Type Structures 3.1. Ribbon-Type Structures via Repetitive Diels-Alder reactions 3.2. Ribbon-Type Structures via Polymer-Analogous Cyclization of Linear Precursors 3.2.1. Double-Stranded Poly(phenylene)s via Cyclization of Open-Chain Precursors 3.2.2. Oligorylenes - Synthesis of Ribbon-Type Molecules with peri-Fused Naphthalene Units 4. Conclusions
A route to generate cyclacenes by on‐surface synthesis is explored. We started by synthesizing two tetraepoxycyclacenes by sequences of Diels–Alder cycloadditions. Subsequently, these molecules were deposited onto Cu(111) and scanning‐tunneling‐microscopy(STM)‐based atom manipulation was employed to dissociate the oxygen atoms. Atomic force microscopy (AFM) with CO‐functionalized tips enabled the detailed
CONDENSED POLYCYCLIC AROMATIC COMPOUND, PRODUCTION PROCESS OF SAME, AND POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY CONTAINING SAME
申请人:Ohmori Osamu
公开号:US20130078514A1
公开(公告)日:2013-03-28
Provided is a condensed polycyclic aromatic compound, having superior lithium ion responsivity and is suitable for lithium ion secondary battery applications, a production process thereof, a positive electrode active material containing that condensed polycyclic aromatic compound, and a positive electrode for a lithium ion secondary battery provided therewith, and further provided is a lithium ion secondary battery, having high capacity and superior cycling adaptability, that has the positive electrode as a constituent thereof.
The condensed polycyclic aromatic compound according to the present invention has at least four imino groups in a molecule thereof.