通过生物基环氧单体的部分碳化来控制混合聚氨基的粘合剂和风湿性质
Pierre Delliere1, Dorian Laborie1, Sylvain Caillol1
1ICGM, Univ Montpellier, CNRS, ENSCM, Montpellier, 34293, France.
Macromolecular rapid communications
|July 29, 2024
概括
生物基混合粘合剂由果仁的环氧衍生物和m-二胺表现出增强的粘合力. 与传统的环氧树脂相比,这些玻璃热具有可调节的性能和更好的性能.
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
- 粘合剂技术 技术 粘合剂技术
背景情况:
- 开发可持续的高性能热粘合剂对各种行业至关重要.
- 生物基单体为减少环境影响提供了一个有前途的途径.
- 通过简单的单体设计调整材料特性是一种优雅的方法.
研究的目的:
- 准备和表征新的生物基混合型聚氧氨/聚氧热固粘剂.
- 为了研究将氧氨部分纳入对粘附和热力学性能的影响.
- 探索混合粘合剂的玻璃性行为和再处理能力.
主要方法:
- 合成混合型聚氨酸/聚氧基从果仁的环氧衍生物 (NC514) 和m-二胺 (MXDA).
- 使用减弱总反射红外光谱 (ATR-IR) 监测固化反应.
- 通过膨胀试验,热重力测量分析 (TGA),动态机械分析 (DMA),差分扫描热度计 (DSC),拉力测试,学和膝盖剪切测试进行表征.
- 再处理测试以评估玻璃性质.
主要成果:
- 环氧胺和循环碳酸氨解反应的同时固化产生了均的材料.
- 混合网络显示了增强的粘附性质 (高达20%),与整洁的环氧树脂相比,由于结合和玻璃性行为.
- 具有高达47mol%循环碳酸盐组的粘合剂表现出共价交换能力,保持热力学性能和改善粘合力.
结论:
- 简单的单体设计可以控制可调节热稳固粘合剂的混合材料特性.
- 开发的生物基混合粘合剂提供了卓越的粘附和再加工能力,为传统环氧树脂提供了可持续的替代品.
相关概念视频
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
1.9K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
Types 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
Hydration of Cement
214
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
214
Carbonation Shrinkage
123
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
123
Polymer 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
Additives and Fillers in Concrete
92
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
The...
92


