用石墨烯丰富的线性低密度聚乙烯:对其旋转成型和性能的影响
Francisco Pereira de Araújo Júnior1, Enzo Erbisti Garcia1, Gerson Alberto Valencia Albitres1
1Instituto de Macromoléculas Professora Eloisa Mano, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Avenida Horácio Macedo, 2030, Bloco J, Ilha do Fundão, Rio de Janeiro 21945-970, Brazil.
ACS omega
|October 13, 2025
概括
将石墨烯 (GP) 添加到线性低密度聚乙烯 (LLDPE) 中,可以显著降低旋转成型的能耗,并提高冲击强度. 石墨烯提高了导热性,有助于加工和材料性能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物工程 聚合物工程
- 纳米技术 纳米技术
背景情况:
- 石墨烯 (GP) 具有特殊的导热性和适合各种应用的性能.
- 线性低密度聚乙烯 (LLDPE) 是旋转成型中广泛使用的聚合物.
- 调查GP对LLDPE加工和性能的影响对于先进的材料开发至关重要.
研究的目的:
- 评估石墨烯添加对LLDPE旋转成型过程的影响.
- 描述含有石墨烯的LLDPE复合材料的物理和热性能变化.
- 探索用石墨烯增强的LLDPE节能和提高性能的潜力.
主要方法:
- 旋转成型实验使用在不同度下与石墨烯主批富制的LLDPE进行.
- 材料的表征包括落箭撞击测试,差分扫描热度计 (DSC),融化流速 (MFR) 分析,风学测量,WAXD,拉曼光谱和导热性评估.
- 优化成型条件需要确定内部高峰空气温度.
主要成果:
- 加上石墨烯,在LLDPE的旋转成型过程中节省了大量的能源.
- 由于存在石墨烯,LLDPE复合材料的冲击强度得到了显著提高.
- 热度计测量表明,LLDPE与石墨烯的结晶度降低,与增强的导热率和更快的冷却速度相关.
- WAXD和拉曼光谱证实了石墨烯的存在,即使在低度,也没有改变整体的质行为.
结论:
- 石墨烯的加入增强了LLDPE的导热性,从而可以在旋转成型中节省能源.
- 改进的热性能有助于增加聚合物基质的冲击强度和部分无形化.
- 石墨烯是一种有前途的添加剂,用于修改LLDPE性能,用于先进的应用.
相关概念视频
Polymer Classification: Architecture
3.7K
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...
3.7K
Free-Radical Chain Reaction and Polymerization of Alkenes
9.4K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
9.4K
Ziegler–Natta Chain-Growth Polymerization: Overview
3.9K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.9K
Polymer Classification: Stereospecificity
3.1K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.1K
Molecular Weight of Step-Growth Polymers
2.7K
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...
2.7K
Types of Step-Growth Polymers: Polyesters
2.5K
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...
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...
2.5K


