铁颗粒和聚乙烯糖醇对聚基基复合材料选定的特性的影响
Zbigniew Oksiuta1, Dominika Nowińska1, Magdalena Joka Yildiz2
1Faculty of Biomedical Engineering, Bialystok University of Technology, Wiejska 45C, 15-351 Bialystok, Poland.
Polymers
|January 25, 2025
概括
将纳米铁粉添加到聚酸 (PLA) 复合材料中,可以提高拉伸强度和延长. 聚乙烯甘醇可以改善颗粒的粘附性,增强机械性能,特别是在微细的纳米铁颗粒中.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 生物材料工程 生物材料工程
背景情况:
- 聚酸 (PLA) 是一种可生物降解的聚合物,在各种领域都有潜在的应用.
- 加入铁粉等填充剂可以改变PLA的机械和物理性质.
- 了解填充剂-矩阵相互作用对于开发先进的复合材料至关重要.
研究的目的:
- 研究铁粉和纳米铁粉对聚酸复合材料特性的影响.
- 评估聚乙烯糖醇对这些复合材料的机械性能和粘合力的影响.
- 为了比较微型和纳米尺寸的铁颗粒作为PLA中的填充剂的性能.
主要方法:
- 使用聚乙烯,铁粉 (1-10重量%),纳米铁粉 (0.1-1.0重量%) 和聚乙烯糖醇制备九种复合变体.
- 加工技术包括混合,挤出和压缩.
- 描述涉及拉伸试验,海岸硬度,断裂表面分析,降解试验和DSC分析.
主要成果:
- 与微铁粉相比,纳米铁粉在PLA中提高了拉伸强度和延长.
- 添加聚乙烯甘醇降低了扬模量,但增强了粒子粘附,强度和延长.
- 微铁粉一般降低了扬氏模量,而纳米铁粉略微增加了它.
结论:
- 精细的纳米铁颗粒在PLA复合材料中提供了优越的机械性能,这是由于更好的矩阵粘合.
- 聚乙烯甘醇是一种有益的添加剂,可以改善含铁的PLA复合材料的性能.
- 优化纳米铁含量和利用聚乙烯糖醇可以带来增强的生物降解复合材料.
相关概念视频
01:00Characteristics and Nomenclature of Homopolymers
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.
01:14Polymer Classification: Architecture
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...
01:21Polymer Classification: Crystallinity
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...
01:26Polymer Classification: Stereospecificity
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...
01:20Anionic Chain-Growth Polymerization: Overview
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,...
01:28Classification and Mechanical Properties of Synthetic Polymers
Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...