O-カルボシアンヒドリドとエポキシドの簡単なタンデム共聚化により,機能化されたポリエステル-b-炭酸塩を合成する
1Department of Chemical Engineering, Virginia Polytechnic Institute and State University, 635 Prices Fork Road, Blacksburg, Virginia24061, United States.
Journal of the American Chemical Society
|October 24, 2022
まとめ
研究者らは,O-カルボキシアン水化物とエポキシドを用いて,分解可能なポリエステル-B-炭酸塩を作るための持続可能な"ポット"方法を開発しました. この原子経済的なプロセスは 高圧と高温を避けることで 高分子量ポリマーと 強化された強度を生成します
科学分野:
- ポリマー化学
- 持続可能なプラスチック
- 材料科学
背景:
- 明確に定義された分解可能なブロックコポリマーの合成は持続可能なプラスチック産業にとって不可欠です.
- ポリエステル・コカーボネートに関する現在の方法は,高圧CO2と高温を必要とするエネルギー密集型です.
研究 の 目的:
- 機能化されたポリエステル-B炭素酸を合成するための原子経済的でスケーラブルな方法の開発.
- 軽い条件下で高分子量と狭い分子量分布を達成する.
主な方法:
- 単一のルイス酸性亜鉛複合体を利用して,O-カルボキシアン水化物 (OCAs) とエポキシドのブロック共聚化を行いました.
- 圧縮されたCO2なしで室温でポリメリゼーションを行った.
- OCAリング開封のゼロオーダー運動を観察して,ポリメリゼーション運動を分析した.
主要な成果:
- 高分子量 (> 200 kDa) と狭い分布 (Đ < 1.1) を有する機能化されたポリエステル-β-炭酸塩を成功裏に製造した.
- 室温と環境圧で動作する原子経済的でスケーラブルなプロセスを実証しました.
- 合成されたポリマーはホモポリマーに比べて頑丈で,商品ポリオレフィンよりも性能が優れていた.
結論:
- 開発された方法は,高性能の分解可能なブロックコポリマーへの持続的かつ効率的な経路を提供します.
- このプロセスは,既存のエネルギー密集型戦略の限界を克服します.
- この進歩は持続可能なプラスチック産業に 大きな可能性を秘めています
関連する概念動画
Alkylation of β-Diester Enolates: Malonic Ester Synthesis
3.5K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
3.5K
Types of Step-Growth Polymers: Polyesters
2.3K
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...
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
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
3.1K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
3.1K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
18.4K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
18.4K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism
8.1K
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
8.1K
Esters to Carboxylic Acids: Saponification
4.6K
Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
The reaction requires a base in stoichiometric amounts, which participates in the reaction and is not regenerated later. So, the base acts as a...
The reaction requires a base in stoichiometric amounts, which participates in the reaction and is not regenerated later. So, the base acts as a...
4.6K


