チェーン内ケトンを含んだポリエチレン材料
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
PubMedで要約を見る
まとめ
この要約は機械生成です。研究者たちはケト群を加えることでポリエチレンを 環境にやさしいものにする 新しい方法を開発しました この改変は望ましい性質を維持し,光分解性を導入し,プラスチックの持続性に対処します.
科学分野
- ポリマー化学
- 材料科学
背景
- ポリエチレンは,無性炭化水素鎖による環境持続性で知られる広く使用されるプラスチックです.
- ポラーグループをポリエチレンに組み込むことは,その互換性を高め,環境への影響を軽減することができます.
研究 の 目的
- 極性グループを持つポリエチレンを機能化する方法を開発する.
- 光分解性ポリエチレンを作り 材料の性質を保持する
主な方法
- イチレンと一酸化炭素の触媒共ポリメリゼーションは,フォスフィノフェノラート-調整ニッケル複合体を使用します.
- 注射成形後のコポリマーの特性
主要な成果
- 鎖内ケト群の密度が低い高分子量ポリエチレンを 合成しました
- 改造されたポリエチレンは,高密度ポリエチレンに匹敵する牽引性能を保持しました.
- 材料は加工後に光分解性を示した.
結論
- フォスフィノフェノラートニッケル触媒は,ケト群をポリエチレンに効率的に組み込むことを可能にします.
- この機能化は,調節可能な性質と光分解性を持つ環境改善されたポリエチレンへの道を開きます.
関連する概念動画
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.
Alkenes undergo polymerization via a free-radical mechanism involving three steps: initiation, propagation, and termination.
Radicals are...
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...
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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,...
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...