由单链封闭引发的全面聚合物放松增强了纳米复合材料的机械稳定性
Jin Huang1, Hangsheng Zhou1,2, Longhao Zhang1
1Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
Nature communications
|August 8, 2024
概括
研究人员使用复杂的流体开发了先进的聚合物纳米复合材料,以获得卓越的动态机械稳定性和能量消耗. 这些材料克服了传统的权衡,在广泛的温度和频率范围内提供了强大的性能.
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
- 纳米技术 纳米技术
背景情况:
- 目前的聚合物纳米复合材料研究优先考虑静态机械增强.
- 在复杂的使用条件下,动态机械性能和能量消耗对材料至关重要.
- 由于聚合物链物理,纳米复合材料中常常存在静态和动态力学之间的权衡.
研究的目的:
- 开发超稳定的动态机械复杂流体纳米复合材料,具有高能耗.
- 在动态应用中克服传统聚合物纳米复合材料的局限性.
- 通过单链封闭,在广泛的时间范围内定制聚合物动态.
主要方法:
- 将复杂的流体注入到聚合物的纳米封闭空间中.
- 使用单链封闭来控制聚合物动态.
- 在广泛的频率和温度范围内表征动态机械性能.
主要成果:
- 实现了稳定的存储模量 (10^010^2 MPa) 和高能耗 (损耗系数>0.4).
- 在广泛的频率范围 (10^-110^7 Hz) 和温度范围 (-3585°C) 中表现出稳定的性能.
- 与传统的聚合物纳米复合材料相比,在高能耗散区域中表现出10倍高的动态机械稳定性.
结论:
- 将复杂流体注入纳米封闭空间的策略对于创建先进的聚合物纳米复合材料是有效的.
- 这些材料提供了特殊的动态机械稳定性和能量消耗,适合苛刻的应用.
- 单链封闭提供了一种途径,可以为增强材料性能量身定制全面的聚合物动态.
相关概念视频
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
01:08Molecular Weight of Step-Growth Polymers
2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
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