交叉连接剂量如何影响基乙基甲酸冷凝的最终特性
Giuseppe Proietto Salanitri1,2, Enrica Luzzi3, Daniele Caretti2
1CNR-Institute for Polymers, Composites and Biomaterials, Via Paolo Gaifami 18, 95126 Catania, Italy.
Gels (Basel, Switzerland)
|March 27, 2024
概括
调查基乙基甲基酸盐 (HEMA) 冰凝显示,调整单体/交叉连接器比率可以显著提高机械强度,而不会影响吸附效率. 这种可调性是设计用于水和能源应用的材料的关键.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 生物材料工程 生物材料工程
背景情况:
- 基乙基甲酸盐 (HEMA) 冰凝是多功能聚合物网络.
- 调材料的性能对于特定应用至关重要.
- 了解结构属性关系对于材料设计至关重要.
研究的目的:
- 为了研究HEMA冷凝的机械,热和吸附性能.
- 为了确定变化的单体/交叉连接器比对冷凝特性的影响.
- 为了确定HEMA/N,N'-甲-双胺 (MBAA) 的比率和材料性能之间的相关性.
主要方法:
- 合成具有不同MBAA度的HEMA冷凝.
- 扫描电子显微镜 (SEM) 用于宏性分析.
- 膨胀能力测量. 膨胀能力测量.
- 甲紫色 (MV) 的吸附试验.
- 热重力测量分析 (TGA) 测量热稳定性.
- 压缩强度测试. 压缩强度测试.
主要成果:
- SEM显示孔隙宽度降低,孔隙数量增加,MBAA含量更高.
- 膨胀能力在8.7至9.3gW/ggel之间,随着越来越多的交叉连接而下降.
- 对于MV的吸附能力没有显著变化.
- 热稳定性 (T Max) 在MBAA含量 (420-425°C) 的情况下略有增加.
- 压缩模量 (Ec) 在较高的HEMA/MBAA比率下增加了约50%.
结论:
- 调整HEMA/MBAA比率可以提高冷凝的机械性能,而不会影响吸附.
- 低温凝的多孔性和胀与交叉连接剂的含量相反相关.
- 这些发现有助于设计用于水/能源应用的HEMA冷凝.
- 优化HEMA/MBAA比率对于平衡机械强度和生物医学用途的胀至关重要.
相关概念视频
03:12Freezing Point Depression and Boiling Point Elevation
Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
01:18β-Dicarbonyl Compounds via Crossed Claisen Condensations
Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds. The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
01:19Physical Properties of Carboxylic Acid Derivatives
Intermolecular forces dictate several physical properties such as boiling points, melting points, solubilities, and so forth. They are classified into four types: ionic forces, hydrogen bonds, dipole–dipole forces, and dispersion forces. Ionic forces are the strongest, while dispersion forces are the weakest.
Among the carboxylic acid derivatives, the boiling points of acid chlorides and esters are very similar and are the lowest in the series. Acid anhydrides have slightly higher boiling...
Among the carboxylic acid derivatives, the boiling points of acid chlorides and esters are very similar and are the lowest in the series. Acid anhydrides have slightly higher boiling...
01:29Leveling Effect
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...