合成基烯涂层的星形ROMP聚合物:通过精确整合功能,具有独特的排放特性
Kenji Takamizu1, Kotohiro Nomura
1Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo 192-0397, Japan.
Journal of the American Chemical Society
|April 13, 2012
概括
研究人员使用环开放转化聚合 (ROMP) 合成了可溶性星形聚合物. 这些聚合物经过基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
背景情况:
- 星形聚合物由于其架构而具有独特的特性.
- 奥利戈 (thiophene) 以其光电子特性而闻名.
- 控制的聚合技术对于设计功能性材料至关重要.
研究的目的:
- 开发一种易于合成可溶性星形聚合物的方法.
- 为了在聚合物结构中纳入基基基 (基基) 部分.
- 为了研究产生的功能聚合物的排放特性.
主要方法:
- 顺序的活环开放元解聚合 (ROMP) 的诺波伦烯和一个交叉连接试剂.
- 使用一种特定的基于的启动剂进行受控聚合.
- 用oligo (?? 基) 碳酸的终结,以引入功能末端组.
主要成果:
- 成功合成了可溶性星形聚合物,其涂层是基基基基.
- 含有ter和tetrathiophene的恒星聚合物显示出独特的发射.
- 蓝色的排放被调整为白色的排放,并添加了特定的 styrylpyran 衍生物.
结论:
- 建立了一种简单的合成功能星形聚合物的方法.
- 基烯的整合赋予了可调节的光发光特性.
- 这些材料有可能用于发光器件中的应用.
相关概念视频
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
Olefin Metathesis Polymerization: Overview
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Characteristics and Nomenclature of Copolymers
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
Thermal and Photochemical Electrocyclic Reactions: Overview
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Step-Growth Polymerization: Overview
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...


