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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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...
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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...
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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polymers02:34

Polymers

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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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ポリプロピレンサクシネート (PPS):新しいポリマーステレオコンプレックスである.

Julie M Longo1, Angela M DiCiccio, Geoffrey W Coates

  • 1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States.

Journal of the American Chemical Society
|November 5, 2014
PubMed
まとめ
この要約は機械生成です。

研究者らは,ポリプロピレンサクシネート (PPS) 鎖から新しいポリマーステレオコンプレックスを作成した. この新しい素材は熱性能を向上させ,先進的な半結晶ポリエステルへの有望な経路を提供している.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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科学分野:

  • ポリマー化学のポリマー化学について
  • マテリアルサイエンス 材料科学
  • オーガニック・シンセシス オーガニック・シンセシス

背景:

  • ポリプロピレンサクシネート (PPS) は,循環性アンヒドリドとエポキシドの共ポリマー化によって合成されます.
  • ポリマーのステレオコンプレクセーションは,材料の特性強化につながる可能性があります.
  • 既存の半結晶ポリエステルは,熱性能に制限があります.

研究 の 目的:

  • ポリプロピレンサクシネートを使用してポリマーステレオ複合体の形成を調査する).
  • 結果となるステレオ複合体の熱的性質を評価する.
  • ステレオコンプレクセーションを,高度なポリエステルを作るための実用的な方法として確立する.

主な方法:

  • アイソタクティック,レジオレギュラーポリ ((プロピレンサクシネート)) 鎖の合成.
  • エナンチオピュアポリマー鎖を混合してステレオコンプレクセーションを誘発する.
  • ステレオ複合体と親ポリマーの熱特性分析.

主要な成果:

  • ポリプロピレンサクシネート (PPS) のステレオ複合体の成功形成.
  • ステレオコンプレックスは,エナチオピュアポリマーと比較して,熱特性が大幅に改善されたことを実証しました.
  • このプロセスは,容易に入手可能な出発材料を使用します.

結論:

  • ステレオコンプレクセーションは,ポリプロピレンサクシネートの熱性能を高めるための効果的な戦略です.
  • この研究は,優れた性能を持つ半結晶型ポリエステルの新種を導入しています.
  • この方法は,アクセシブルな前駆体から高性能ポリマーへの持続可能な経路を提供します.