功能化纤维作为回收聚合物复合材料中的合增强剂
Klementina Pušnik Črešnar1,2, Olivija Plohl1, Lidija Fras Zemljič1
1Faculty of Mechanical Engineering, University of Maribor, 2000 Maribor, Slovenia.
Materials (Basel, Switzerland)
|June 19, 2024
概括
这项研究用纳米纤维素功能化的木纤维增强了回收聚烯复合材料,改善了可持续包装应用的机械性能和生物降解性.
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:
- 像聚烯 (PP-r) 这样的回收塑料在实现所需材料特性方面存在挑战.
- 木纤维 (WF) 提供了可持续的填充物,但需要表面修改以更好地兼容聚合物矩阵.
- 木纤维的纳米纤维素 (nC) 功能化可以增强界面粘附性和整体复合材料性能.
研究的目的:
- 研究纳米纤维素功能化的木纤维回收聚烯复合材料 (nW-PPr) 的结构性质关系.
- 探索nC功能化对PP-r复合材料的热,晶体,形态和机械性能的影响.
- 评估这些复合材料在环保应用中的潜力,特别是在包装中.
主要方法:
- 一个两步过程,涉及WF的nC功能化,然后挤出到PP-r复合材料.
- 使用X射线衍射 (XRD),DSC,TGA,SEM,ATR-FTIR,泽塔电位和DMA进行全面的材料表征.
- 对界面粘附,结晶行为,表面特性和机械性能进行系统分析.
主要成果:
- 由于H键形成,nW和PP-r之间改善了界面粘附和兼容性.
- nC作为核化剂,在低度 (1.0 wt%) 上增加结晶性,在高度 (3.0-9.0 wt%) 上促进界面相互作用.
- 增强的机械性能,包括更高的存储模量,归因于更好的结晶性,形态和粘合性.
结论:
- 木纤维的纳米纤维素功能化显著提高了回收聚烯复合材料的性能.
- 开发的nW-PPr复合材料表现出更好的性能和生物降解性,为包装提供了可持续的替代品.
- 这项研究提供了从回收资源开发先进的环保材料的见解.
相关概念视频
Fiber Reinforced Concrete
75
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...
75
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
Additives and Fillers in Concrete
93
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...
93
Reinforcements in Concrete
82
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
82


