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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.8K
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...
2.3K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.6K
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...
3.6K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
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...
2.9K
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.1K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.5K
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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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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化学的に円形で,機械的に頑丈で,溶解処理可能なポリヒドロキシアルカノ酸

Li Zhou1, Zhen Zhang1, Changxia Shi1

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA.

Science (New York, N.Y.)
|April 6, 2023
PubMed
まとめ

研究者達は新しいタイプのポリヒドロキシアルカノ酸 (PHAs) を開発しました 溶解処理可能で 耐久性があり 再利用可能です この画期的な発見は 持続可能なプラスチックの課題を解決し 循環型経済への道を切り開きます

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科学分野:

  • ポリマー化学
  • 材料科学
  • 持続可能なプラスチック

背景:

  • ポリヒドロキシアルカノ酸 (PHAs) は,生物分解性および生物再生性ポリマーであり,持続可能なプラスチックとしての可能性を秘めています.
  • 現在のPHAsは,溶融処理能力の低下,脆性,およびリサイクル能力の低下により,広範な採用を妨げています.
  • 循環型プラスチック経済を実現するには バイオプラスチックのリサイクル能力が向上する必要があります

研究 の 目的:

  • 熱安定性を向上した新しい合成ポリヒドロキシアルカノ酸 (PHA) プラットフォームを開発する.
  • 溶解処理性,機械特性,再利用性など,現在のPHAの限界を克服する.
  • 循環型経済に適した性能を向上させるため,PHAを設計する.

主な方法:

  • PHAのリピートユニットからアルファ水素を取り除き,新しいPHAプラットフォームを合成した.
  • PHAポリマーの骨格にアルファ変異を導入した.
  • 改造されたPHAの熱的安定性,溶解処理性,機械的特性,化学的再利用性を評価した.

主要な成果:

  • 改造されたPHAsは,アルファ水素の欠如により,シス除去を防ぐため,著しく熱安定性を発揮します.
  • 構造変更により,PHAsは溶解処理可能になります.
  • 新しいPHAsは,機械的な耐久性,本質的な結晶性,および閉鎖ループの化学的リサイクル性を改善しています.

結論:

  • アルファ水素をアルファ変異で除去することは,PHAの熱安定性と処理性を高めるための効果的な戦略です.
  • この構造的革新は 頑丈で結晶性があり 化学的に再利用可能なPHAsへの道を開きます
  • 開発されたPHAプラットフォームは持続可能なプラスチックと循環型経済のための有望な解決策を提供します.