高玻璃过渡聚合物通过环开放式共聚合 (ROCOP) 用化和环氧化物生产
Selena Silvano1,2, Matteo Proverbio1, Adriano Vignali1
1Institute of Chemical Science and Technologies-"G. Natta", National Research Council, Via A. Corti 12, 20133 Milan, Italy.
Polymers
|July 14, 2023
概括
高玻璃过渡温度聚合物通过环开通共聚合合成,使用氧化烯或氧化乙烯和无化通过环开通共聚合. 这些新材料具有出色的热性能,具有生物降解和功能化的潜力.
科学领域:
- 聚合物化学 聚合物化学
- 材料科学 材料科学 材料科学
- 有机合成 有机合成
背景情况:
- 开发具有增强热稳定的高性能聚合物对于先进材料应用至关重要.
- 环开 copolymerization (ROCOP) 提供了一种多功能途径来合成定义良好的聚合物架构.
- 探索生物基单体,如烯氧化物 (LO) 和乙烯基环烯氧化物 (VCHO) 是可持续聚合物开发的关键.
研究的目的:
- 为了合成高玻璃过渡温度 (Tg) 的聚合物,使用氧化 (LO) 或氧化 (VCHO) 和化 (PA).
- 研究催化剂/共催化剂系统和反应条件对聚合结果的影响.
- 评估产生的共聚物质的热性能,生物降解性和功能化潜力.
主要方法:
- 在LO或VCHO与PA的交替环开合聚合 (ROCOP) 过程中,使用salen类金属复合物 (Cr,Al,Mn) 和催化剂 (DMAP,PPNCl,PPNN3).
- 优化接触前时间和聚合持续时间,以控制分子量和Tg.
- 使用GPC,DSC,TGA和生物降解试验进行表征 (ISO 14851);通过乙烯点击化学功能化.
主要成果:
- 成功合成了高达136°C的Tg和高达14.0kg/mol的分子重量的聚合物.
- 观察到低聚乙烯单位 (<3mol%),表明有效的交替共聚合.
- 聚 ((LO-alt-PA) 证明了生物降解性,而乙烯基组允许易于进行醇修饰.
结论:
- 盐酸类型的催化剂能够有效地ROCOP循环环氧化物和甲,产生高Tg聚合物.
- 合成的聚烯具有可调节的热性能,并有可能进行进一步的修改和可持续应用.
- 这项研究突出了从可再生资源中制造先进的,功能性的聚烯的有希望的途径.
相关概念视频
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
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.6K
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...
2.6K
Acid-Catalyzed Ring-Opening of Epoxides
7.4K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
7.4K
Base-Catalyzed Ring-Opening of Epoxides
8.6K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
8.6K
Preparation of Epoxides
7.9K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
7.9K
Olefin Metathesis Polymerization: Overview
2.2K
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...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.2K


