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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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

Free-Radical Chain Reaction and Polymerization of Alkenes

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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.
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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ポリエチレンとポリプロピレンの組み合わせ:PE/PPマルチブロックポリマーによる性能向上

James M Eagan1, Jun Xu2, Rocco Di Girolamo1

  • 1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, NY 14853, USA.

Science (New York, N.Y.)
|February 25, 2017
PubMed
まとめ

研究者は,不混合プラスチックを混合するためにポリエチレン/同位性ポリプロピレンマルチブロックコポリマーを開発しました. これらの新しい共ポリマーにより,一般的なポリエチレンとイソタキシ性ポリプロピレンの溶接が可能になり,再利用性と材料の耐久性が向上します.

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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科学分野:

  • ポリマー科学
  • 材料科学
  • 化学工学

背景:

  • ポリエチレン (PE) とイソタキシポリプロピレン (iPP) は広く使用されているプラスチックですが,混じり合わないものです.
  • 複合材料のリサイクルや 複合材料の製造には 大きな課題があります
  • これらの豊富なポリマーの有用性を高めるには 効果的な互換化戦略の開発が不可欠です

研究 の 目的:

  • 新しいPE/iPP複合ポリマーを合成する.
  • これらのコポリマーが不溶性PEとiPPを適合させ,混合する能力を調査する.
  • PE/iPPの混合物の機械性能の改善の可能性を調査する.

主な方法:

  • イソセレクティブアルケンのポリメリゼーションイニシアターを使用したPE/iPPマルチブロックコポリマーの合成.
  • コポリマー構造と分子重量の特徴
  • 商用PEとiPPのコポリマーの溶接と混合能力の評価

主要な成果:

  • PE/iPPのマルチブロック共ポリマーの合成が成功しました.
  • コポリマーが一般的なPEとiPPを溶接する能力を示した.
  • テトラブロックコポリマーはインターフェイス互換性を達成し,形態学的制御を可能にしました.
  • 壊れやすいPE/iPPの混合物を機械的に頑丈な混合物に変換する.

結論:

  • PE/iPPのマルチブロックコポリマーは,不混合ポリオレフィンにとって有効な適合剤である.
  • ブロックコポリマーの分子量と構造は,その溶接性能に影響します.
  • このアプローチは,高性能でリサイクル可能なPE/iPPの材料を作るのに有効な経路を提供します.