関連する実験動画

Updated: Jun 12, 2025

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Published on: May 20, 2018

フロントルポリメリゼーションによる結晶領域の制御されたパターニング

Justine E Paul^1,2, Yuan Gao^1,3, Yoo Kyung Go²

¹Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA.

|September 18, 2024

まとめ

研究者らは,多層組織でパターン化されたポリマー材料を自律的に作成するために,フロントポリメリゼーションを用いた新しい方法を開発しました. この技術により微細構造を正確に制御し強度やさなどの機械的性質を高めることができます

科学分野:

材料科学
ポリマー化学
製造業

背景:

柔らかい領域と硬い領域を組み合わせた階層的な材料は優れた性質を示します.
3Dプリントのような現在の製造方法では多次元アーキテクチャの複雑な設計と介入が必要です

研究の目的:

複数のスケールで組織化されたポリオクタディエンのパターンの結晶領域を自律的に製造する.
先進的な材料設計のための新しい迅速な消散処理方法を探求する.

主な方法:

フロントポリメリゼーションのスピンモードのダイナミクスを利用する.
ドメイン形成を制御するために,反応動力学,熱化学,および境界条件の相互作用を利用する.
初期条件とフロントプロパガンダがマイクロ構造に与える影響を調査する.

主要な成果:

複数のスケールで組織されたパターンの結晶領域の自律的な製造.
内部インターフェイスとキュアフロント伝播によって制御される無形および半結晶領域の形成.
ドメインのサイズ,スペース,並べ替えのコントロールを証明した.

結論:

フロントポリメリゼーションは自動で高度なマルチスケール素材を作成するための経路を提供します
機械的特性 (強度,弾性,性) は,初期製造条件とフロントプロパガンダモードを制御することによって調整できます.
この方法は,高性能ポリマーの設計と製造における重要な進歩を表しています.

さらに関連する動画

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

関連する概念動画

Polymer Classification: Crystallinity

Polymer Classification: Crystallinity

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...

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...

Step-Growth Polymerization: Overview

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...

Anionic Chain-Growth Polymerization: Mechanism

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...

Crystal Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...

Polymer Classification: Stereospecificity

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...