无害的CO2基共聚合物:可降解的聚碳酸由二甲酸和它们的-聚合物结合物产生的聚碳酸
Fu-Te Tsai1, Yanyan Wang1, Donald J Darensbourg1
1Department of Chemistry, Texas A&M University , College Station, Texas 77843, United States.
Journal of the American Chemical Society
|March 15, 2016
概括
本研究合成生物相容的聚碳酸盐从 (S) -3,4-二氧化酸环氧化衍生物和CO2. 由此产生的聚合物显示出高碳酸盐含量,区域选择性和药物输送应用的潜力.
科学领域:
- 聚合物化学 聚合物化学
- 生物材料科学 生物材料科学
- 催化剂是一种催化剂.
背景情况:
- (S) -3,4-二基黄油酸 ((S) -3,4-DHBA) 是他类药物的性生物质前体.
- (S) -3,4-DHBA的环氧衍生物是通过与CO2共聚合的生物相容聚合物的潜在单体.
- (III) 盐类催化剂对于二氧化碳共聚合是有效的.
研究的目的:
- 为了合成聚三丁3,4-二氧化酸碳酸盐) 从种族三丁3,4-氧化酸盐和CO2.
- 描述由此产生的聚碳酸盐的特性,包括结合纯度,区域选择性和热特性.
- 探索聚合物的降解行为和潜在的应用,如药物输送载体.
主要方法:
- 使用双功能 ((III)) 盐酸催化剂,与二氧化碳交替对racemic-tert-butyl 3,4-epoxybutanoate进行共聚.
- 聚合物微结构 (碳酸链接,区域选择性) 和热性质 (玻璃过渡温度) 的表征.
- 甲基基的脱保护,脱聚合研究,以及-聚合物合物的合成.
主要成果:
- 合成的聚三丁3,4-二基酸碳酸盐表现出>99%的碳酸盐链接和100%的头到尾区域选择性.
- 该聚合物显示玻璃过渡温度 (Tg) 为37°C,高于甲基3,4-酸 (Tg = 18°C) 的类似物.
- 降解研究产生了生物质,并成功合成了含有21.3-29.5%负载的联体.
结论:
- 双功能 (III) 催化剂有效地从 (S) -3,4-DHBA衍生物和CO2中产生高纯度的聚碳酸盐.
- tert-butyl 保护组增强了聚合物特性,如Tg 和区域选择性.
- 聚3,4-二二酸碳酸盐) 和其衍生物是生物相容材料和制药输送系统的有希望的候选物.
相关概念视频
Bioplastics
18
Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
18
Types of Step-Growth Polymers: Polyesters
2.6K
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 polymer...
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 polymer...
2.6K
Anionic Chain-Growth Polymerization: Overview
2.8K
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,...
2.8K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
2.3K
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...
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...
2.3K
Polymers
42.9K
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...
42.9K
Microbial Bioremediation of Plastics
26
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
26


