関連する実験動画

Updated: Jul 12, 2026

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

低圧で高結晶性ポリエチレンの製造

K Hara, H Schonhorn

    Science (New York, N.Y.)
    |May 7, 1971
    PubMed
    まとめ

    研究者は,低圧で高結晶性ポリエチレンを生成する方法を開発しました. この技術により,ポリエチレンが特殊な密度,融解温度,融合熱で作られ,様々なポリマーに適用できます.

    さらに関連する動画

    Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers08:12

    Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

    Published on: December 16, 2022

    Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications09:22

    Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

    Published on: August 28, 2015

    関連する概念動画

    Polymer Classification: Architecture01:14

    Polymer Classification: Architecture

    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...
    Free-Radical Chain Reaction and Polymerization of Alkenes02:35

    Free-Radical Chain Reaction and Polymerization of Alkenes

    The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
    Types of Step-Growth Polymers: Polyesters01:20

    Types of Step-Growth Polymers: Polyesters

    The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
    Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
    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...
    Polymer Classification: Stereospecificity01:26

    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...