可持续的聚烯混合物:平衡回收内容与可加工性和性能
Tatiana Zhiltsova1,2, Mónica S A Oliveira1,2
1TEMA-Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
Polymers
|June 13, 2025
概括
回收聚烯 (PP) 对于可持续发展至关重要. 在低水平上将再生 PP (PPr) 与原始 PP (PPv) 混合在一起,例如 25% PPr,提供了良好的性能和可回收性平衡,支持循环经济目标.
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
- 可持续工程 可持续工程
背景情况:
- 对可持续材料的日益增长的需求推动了对聚烯回收的兴趣,特别是聚烯 (PP).
- 消费后回收聚烯 (PPr) 的性能往往降解,限制了其应用.
- 了解PPr含量对混合物性能的影响是有效回收的关键.
研究的目的:
- 研究不同后消费回收聚烯 (PPr) 含量对与原始聚烯 (PPv) 混合溶解配方的可加工性,热稳定性,抗氧化性和机械性能的影响.
- 为应用程序确定最佳PPr水平,平衡性能和可回收性.
主要方法:
- 不同比例的PPr/PPv配方的合挤出 (0-100%的PPr).
- 使用融化流量指数 (MFI),微分扫描热量计 (DSC),氧化诱导时间 (OIT),热重力测量分析 (TGA) 和拉伸测试进行表征.
- 挤出与非挤出回收 PP 的比较分析.
主要成果:
- 增加的PPr含量在惰性条件下增强了聚合物流动性和热稳定性,但降低了氧化阻力和延展性.
- 与原始PP (PPv) 相比,25%的PPr混合物保留了96%的弹性模量和101%的收益强度.
- 挤出均质化使回收PP的氧化稳定性提高了22%.
结论:
- 将PPr (例如25%) 添加到PPv中低至中等,为需要可调节性能的应用提供了可行的途径,并支持循环经济目标.
- 融混合和挤出有效地改善了回收聚烯的性能和可加工性.
- 该研究表明,在优化水平下,在不显著损害性能的情况下,在配方中利用回收聚烯的潜力.
相关概念视频
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
Polymer Classification: Stereospecificity
2.4K
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...
2.4K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.5K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.5K
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
Olefin Metathesis Polymerization: Overview
2.0K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.0K
Characteristics and Nomenclature of Homopolymers
3.0K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.0K


