素衍生型,热塑性,非异酸聚氨具有增加的结合含量和性vs石油衍生类型
Jignesh S Mahajan1,2, Zachary R Hinton3, Eduardo Nombera Bueno1,4
1Department of Materials Science & Engineering, University of Delaware, Newark Delaware 19716 USA thepps@udel.edu lkorley@udel.edu.
Materials advances
|May 9, 2024
概括
来自素的可持续聚合物显示出更好的机械性能和可加工性. 具有增强结合的素衍生非异酸聚氨 (NIPU) 具有优越的性和延伸性,为石油基塑料提供更绿色的替代品.
科学领域:
- 聚合物化学 聚合物化学
- 可持续材料科学科学 可持续材料科学
- 生物质的价值化 生物质的价值化
背景情况:
- 石油衍生聚合物面临着环境问题和供应链限制.
- 作为可再生生物质组成部分的,具有作为先进材料的可持续前体的潜力.
- 从素中开发高性能聚合物需要了解结构-性质关系.
研究的目的:
- 从素衍生 bisguaiacols/bissyringols 中合成和描述非异酸盐聚氨 (NIPUs).
- 调查甲氧替代和桥接组对NIPU属性的影响.
- 为了建立结构-财产-处理关系的素衍生NIPU.
主要方法:
- 从具有不同 methoxy 组 (0,2,4) 和桥接组的 bisguaiacols/bissyringols 中合成 NIPU.
- 描述NIPU属性,包括结,延长时断裂,扬模量,抗拉强度,性和融形学.
- 素衍生品NIPU与石油衍生品对应品的比较.
主要成果:
- 增加NIPU中的甲基团显著增强了结 (从~65%到~95%).
- 与以石油为基础的NIPU相比,素衍生的NIPU在破裂时表现出更好的延伸和性,而不会影响机械强度.
- 素衍生的NIPU的融解病理与石油衍生的类似物相比,具有改善的融解流量.
结论:
- 富含甲基的素前体增强了NIPU的热力学稳定性和可加工性.
- 阐明了结构-属性-加工关系,证明了由素衍生的NIPU作为可持续的高性能材料的潜力.
- 这项工作有助于从可再生资源开发先进的环保聚合物.
相关概念视频
01:14Polymer 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
01:26Polymer 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
01:21Polymer Classification: Crystallinity
2.8K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K
01:00Characteristics 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
01:28Stability of Conjugated Dienes
3.4K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.4K
01:20Types 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