作为机械上具有竞争力和化学可回收材料的基替代聚烯酸聚 ((尿-尿素)
Derek C Batiste1, Michaela R Pfau-Cloud1, Hee Joong Kim2
1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States.
ACS macro letters
|October 15, 2024
概括
基替代的聚乙烯烯增强了热塑性聚乙烯-尿素材料,提供了卓越的机械性能和高效的化学回收. 通过脱聚合回收单体,使可持续的材料设计成为可能.
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
- 可持续的高分子.
背景情况:
- 热塑性聚氨酸尿素 (TPUU) 材料具有多功能性,但在可回收性方面经常面临挑战.
- 作为软段的聚乙烯烯酸 (PCL) 的结合可以影响TPUU的特性.
- 在PCL上基替代提供了一条调整材料性能和可回收性的途径.
研究的目的:
- 为了研究用基替代PCL的TPU材料的机械性能.
- 评估这些新型TPUU材料的化学可回收性.
- 了解基对PCL热力学和TPUU性能的影响.
主要方法:
- 合成聚4-甲基烯酸盐 (P4MCL) 和聚4-烯酸盐 (P4PrCL).
- 通过与异二酸盐的反应和与水的链延长来制造TPUU材料.
- 机械测试 (拉伸性能,弹性回收) 和通过环闭脱聚合的化学回收.
- 使用范特霍夫聚合物的热力学分析.
主要成果:
- TPUU材料表现出与商业聚聚氨相似或优越的拉伸性能.
- 与PCL类似物相比,由于P4MCL和P4PrCL的非晶体性质,观察到更强的弹性恢复.
- 通过使用ZnCl2催化剂进行反应蒸脱聚合 (240-260°C,25-140mTorr) 来实现单体回收的高产量.
- 在P4PrCL中的基导致了较低的实际上限温度 (Tc).
结论:
- 基替代PCL是高性能,可回收的TPUU材料的有效软片段.
- 开发的脱聚合法允许高效的单体回收,促进TPUU的循环经济.
- 该研究表明了设计具有量身定制的机械和回收特性的先进聚合物的途径.
相关概念视频
Types of Step-Growth Polymers: Polyesters
2.2K
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...
2.2K
Anionic Chain-Growth Polymerization: Overview
2.1K
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,...
2.1K
Characteristics and Nomenclature of Copolymers
2.5K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.5K
Polymer Classification: Architecture
2.7K
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...
2.7K
Characteristics and Nomenclature of Homopolymers
3.0K
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.
3.0K
Polymer Classification: Stereospecificity
2.4K
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...
2.4K


