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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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 polymer...
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Classification 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...
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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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用石墨烯增强的乙烯复合材料用于先进的应用.

Ramon Mendonça Teles1, Daiana Cristina Metz Arnold1, Marco Antônio Siqueira Rodrigues1

  • 1Graduate Program in Materials Technology and Industrial Processes, Feevale University, Av. Edgar Hoffmeister, No. 600, Pavilion No. 03, Room No. 02, Valetec, Campo Bom, RS 93700-000, Brazil.

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概括

一种新的溶剂辅助方法改善了烯复合材料中的石墨烯分散,大大提高了要求高的应用的热稳定性和机械性能.

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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
  • 纳米技术纳米技术

背景情况:

  • 电 elastomers 提供了极端条件的优良耐受性.
  • 石墨烯的结合可以提高复合材料的性能,但面临分散的挑战.
  • 高效的石墨烯分散是解锁先进的乙烯复合材料特性的关键.

研究的目的:

  • 开发和评估一种溶剂辅助的方法,以改善烯在乙烯中分散的状况.
  • 为了比较通过融混合与溶剂辅助方法制备的石墨烯增强型乙烯的性能.
  • 描述石墨烯加载和分散方法对复合材料性能的影响.

主要方法:

  • 使用融化混合和溶剂辅助方法 (乙尼) 合成具有不同石墨烯含量 (1, 2, 3 phr) 的乙烯复合物.
  • 使用FT-IR,SEM,EDS,TGA,DMA,Shore A硬度和拉伸试验进行表征.
  • 基于石墨烯分散技术对材料性能进行比较分析.

主要成果:

  • 溶剂辅助方法产生了更好的石墨烯分散,由SEM证明.
  • 通过溶剂方法使用2-3phr石墨烯的复合材料显示,降解阻力 (TGA) 增加了38%.
  • 溶剂辅助的3phr石墨烯复合材料表现出更高的玻璃过渡温度 (Tg) 和能量消耗 (DMA),更好的拉伸强度 (21.74 MPa),以及降低的硬度.

结论:

  • 溶剂辅助方法有效地增强了烯在烯中分散的作用.
  • 改进的分散导致链的移动性受到限制和高效的应力转移,提高复合材料的性能.
  • 这项研究强调了一个可行的策略,用于创建用于先进材料应用的高性能乙烯复合材料.