分子间结合的机制 聚乳酸混合结晶的变化 透露的太赫兹光谱法 太赫兹光谱法
Zhenqi Zhu1, Hui Xu1, Lien Zhu1
1Huzhou Key Laboratory of Green Energy Materials and Battery Cascade Utilization, School of Intelligent Manufacturing, Huzhou College, Huzhou 313000, P.R. China.
Analytical chemistry
|January 27, 2026
概括
高性能立体复合物聚乳酸 (SC-PLA) 依赖于键,但同晶体 (HC) 形成使SC结晶变得复杂. 特拉赫兹光谱学揭示了受约束结晶如何影响SC-PLA.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 频谱学是一种光谱学.
背景情况:
- 立体复合聚乳酸 (SC-PLA) 的高性能取决于反聚合物结.
- 同型晶体 (HC) 形成通常会干扰SC-PLA结晶,而确切的机制尚不清楚.
- 需要先进的表征技术来阐明SC-PLA形成动态.
研究的目的:
- 使用特拉赫兹 (THz) 光谱学研究聚乳酸 (PLA) 混合物的温度依赖的结晶动态.
- 了解同晶体 (HC) 形成对PLA中立体复合体 (SC) 结晶的影响.
- 探索THz光谱的潜力,用于SC晶度的定量表征.
主要方法:
- 利用特拉赫兹 (THz) 光谱分析了PLA混合物的温度依赖结晶.
- 专注于探测HC的晶格周期性和SC的键.
- 分析了特定的THz光谱参数,包括1.45 THz的峰值高度,用于SC结晶性评估.
主要成果:
- 观察到在较低温度下SC结合的THz峰值中出现异常的蓝移,偏离了典型的结晶性趋势.
- 将这种异常归因于受制结晶下β晶体的形成,这些晶体占据了空间,但缺乏键,削弱了整个系统的键强度.
- 证明了特定的THz参数,特别是1.45 THz的峰值高度,可以有效地描述SC结晶性.
结论:
- 揭示了形状转换对SC-PLA系统中键的显著影响.
- 提供了使用THz光谱学在多元组件聚合物系统中SC晶度的定量表征的新见解.
- 突出了THz光谱在理解复杂结晶行为和聚合物的相互作用方面的实用性.
相关概念视频
Hydrogen Bonds
132.4K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
132.4K
Hydrogen Bonds
13.8K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
13.8K
Intermolecular Forces in Solutions
39.3K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
39.3K
Intermolecular Forces
70.7K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
70.7K
Intermolecular vs Intramolecular Forces
96.6K
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
96.6K
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
51.3K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
51.3K


