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Metallic Solids02:37

Metallic Solids

18.3K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.3K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.7K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.8K
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...
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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

158
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
158
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.5K
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...
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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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一次元調整ポリマーを合金して,柔らかい材料を作成する

Teerat Watcharatpong1, Daniel Crespy1, Kentaro Kadota2

  • 1Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand.

Journal of the American Chemical Society
|August 12, 2024
PubMed
まとめ

研究者らは,溶解編みで新しい調整ポリマー (CP) 合金を作りました. これらの繊細な材料は高い可塑性変形を示し,高度な材料の応用の可能性を示しています.

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科学分野:

  • 材料科学
  • ポリマー化学
  • 固体化学

背景:

  • コーディネーションポリマー (CP) は,調節性特性を有する多用途材料です.
  • 先進的なCPベースの材料を作るための新しい方法の開発は,技術革新にとって極めて重要です.

研究 の 目的:

  • 調合ポリマー (CP) の合金を溶融で調製することを実証する.
  • これらの新型CP合金の構造的,熱的,機械的性質を調査する.

主な方法:

  • 2つの溶解可能な1次元の結晶構造の溶解.
  • シンクロトロンX線吸収と分散
  • 固体核磁気共振 (NMR) スペクトロスコーピー
  • ディフェンショナル・スキャニング・カロメトリー (DSC)
  • 粘着弾性測定について

主要な成果:

  • CP合金は,異なるCP前駆物質を溶かして成功裏に製造された.
  • 構成要素CPの比率は結晶/無形領域と熱特性 (溶解,ガラス化) に影響する.
  • 同等のCPの比率を持つ合金は,添加物なしで破裂点128%に達する例外的な柔らかさを示した.

結論:

  • メルトクネディングは,CP合金を作るのに有効な技術です.
  • CP合金の組成に依存する性質は,機械的性能をチューニングすることを可能にします.
  • 証明された柔らかさは,これらのCP合金が高度な柔らかい材料として持つ可能性を強調しています.