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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

3.5K
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...
3.5K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

5.0K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
5.0K
Polymers02:34

Polymers

42.0K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
42.0K
Molecular Models02:00

Molecular Models

44.2K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
44.2K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

4.1K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
4.1K
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

4.2K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
4.2K

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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超分子共ポリマー:理論モデルによって明らかになった構造と組成

Anindita Das1,2, Ghislaine Vantomme1,2, Albert J Markvoort2,3

  • 1Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Journal of the American Chemical Society
|May 10, 2017
PubMed
まとめ

この研究は,ベンゼン-1,3,5-トリカルボキシアミド (BTA) モノメアの微妙な構造的差異が,超分子共ポリマー形成にどのように影響するかを明らかにしています. モノマー組成がコポリマー構造と性質を決定し,非共性ポリマー組成の洞察を提供することを明らかにした.

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科学分野:

  • 超分子化学
  • ポリマー科学
  • 材料科学

背景:

  • 超分子共ポリマーは,形成メカニズムが十分に理解されていない合成ポリマーの非共性アナログである.
  • 超分子共ポリマーの組成と長さを制御することは,その適用にとって極めて重要です.
  • ベンゼン-1,3,5-トリカルボキシアミド (BTA) モノメアは,超分子組立を研究するための汎用的なプラットフォームを提供します.

研究 の 目的:

  • 2つの構造的に異なる BTA モノマー間の超分子共聚化メカニズムを解明する.
  • モノマー構造と組成がコポリマー形成と性質に及ぼす影響を調査する.
  • 超分子コポリマーにおける熱力学パラメータと種分布を定量化するための理論モデルを開発する.

主な方法:

  • "軍曹と兵士の方法"を用いた円形二極光学 (CD) を含む実験的アプローチを組み合わせた.
  • 実験データの理論的モデリングと数学的分析.
  • アルキルBTAとオリゴジメチルシロキサン (oDMSi) -BTAモノメアのホモポリマー化メカニズムを調査した.

主要な成果:

  • アキラルとキラルBTAモノマーを混ぜると予期せぬキラル誘導が観察された.
  • 異なるホモポリメリゼーションメカニズムが示されている:アルキルBTAには協力性があり,ODMSi-BTAにはイソデミック性がある.
  • モノマー組成がコポリマーヘリシティと種分布を決定し,低 (<10 mol%) と高 (>25 mol%) のoDMSi-BTA分数の異なる行動を示した.

結論:

  • BTAモノメアの微妙な構造的差異は,高分子共聚化に大きく影響する.
  • 開発された理論モデルは熱力学的パラメータと種の分布を正確に定量化しています.
  • この研究は,超分子共ポリマー形成の基本的な理解を提供し,新しい非共性ポリマーを設計するための道を開きます.