関連する実験動画

Updated: Jul 12, 2026

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
09:39

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

閉じ込められたポリマー溶融の粘着弾性ダイナミクス

H W Hu, S Granick

    Science (New York, N.Y.)
    |November 20, 1992
    PubMed
    まとめ

    超薄ポリマーフィルムは,大量サンプルでは見られないゴムのような弾性を示します. ミカの間に閉じ込められたポリフェニルメチルシロキサンで観察されたこの現象は,薄いポリマーフィルムにおける強化された絡み合い相互作用を示唆する.

    さらに関連する動画

    Studying Large Amplitude Oscillatory Shear Response of Soft Materials06:07

    Studying Large Amplitude Oscillatory Shear Response of Soft Materials

    Published on: April 25, 2019

    The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton08:50

    The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

    Published on: March 10, 2023

    関連する概念動画

    Determination of Molar Masses of Polymers II01:27

    Determination of Molar Masses of Polymers II

    Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...
    Members Made of Elastoplastic Material01:19

    Members Made of Elastoplastic Material

    The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
    As the bending moment...
    Plastic Behavior01:21

    Plastic Behavior

    A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
    Polymers: Molecular Weight Distribution01:10

    Polymers: Molecular Weight Distribution

    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.
    Polymer Classification: Crystallinity01:21

    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...
    Fluid Mosaic Model01:34

    Fluid Mosaic Model

    The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...