頑丈な構造工学のために,幾何学的な特徴を離散的な線形ポリマーチェーンに精密にコードする
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
PubMedで要約を見る
まとめ
この要約は機械生成です。この研究は,ポリマーの形状を制御する新しい方法を導入し,分子幾何学を明らかにします.
科学分野
- ポリマー化学
- 材料科学
- 超分子化学
背景
- 分子形はポリマーの自己組織化に重大な影響を及ぼしますが,制御することは困難です.
- 既存の方法は,自己組み立ての研究のためのポリマーアーキテクチャの調節に精度がない.
研究 の 目的
- ポリマーの分子幾何学を工夫するための正確な方法を開発する.
- 分子幾何学が自己組織化行動に及ぼす影響と,その結果生じる複雑な相を調査する.
主な方法
- 繰り返しモノメア結合を介してプログラム可能なサイドチェーンのグラデントを持つ離散ポリマーを合成する.
- 精密な化学合成を用いて,欠陥を排除し,均一な鎖の長さを確保する.
- フランク・カスパーや準結晶構造のような 複合的な段階の自己組み立てを特徴づける
主要な成果
- 制御された幾何学的な特徴を通して多様なポリマー形状を達成しました.
- 欠陥のないシステムで観察された非従来の複合相 (A15, σ,二角形準結晶).
- 微妙な幾何学的な変化に対する自己組み立ての高い感受性が示され,格子パラメータと相安定性に影響します.
結論
- 分子幾何学はポリマーの自己組み立てと 構造工学を導くための強力なツールです
- 分子構造の正確な制御は 自己組織化に関する基本的な研究を可能にします
- 幾何学的な引数は,観測された相行動と格子対称性を説明する.
関連する概念動画
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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...
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.
Figure 1: Propylene homopolymerization to polypropylene.
The chemical name of a homopolymer is generated by using the name of its monomer with a prefix...
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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...
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...