玻璃化剂作为聚乙烯和聚烯混合物的兼容剂
Kosuke Yokoyama1, Zhibin Guan1,2,3
1Department of Chemistry, University of California, Irvine, California, 92697, United States.
Angewandte Chemie (International ed. in English)
|February 26, 2024
概括
一种新的玻璃化方法提高了聚合物混合物的兼容性和可回收性. 添加少量的西洛-交联聚乙烯玻璃剂可以改善高密度聚乙烯和聚烯混合物的机械性能和相位稳定性.
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
- 可持续材料 可持续材料
背景情况:
- 聚合物混合物需要有效的兼容,以提高性能和回收利用.
- 传统的兼容化方法通常是专门用于混合组合的.
- 需要多功能兼容化策略.
研究的目的:
- 引入一种使用玻璃剂的聚合物混合物兼容性的新方法.
- 为了证明一个素-交叉链接的聚乙烯玻璃剂在使高密度聚乙烯 (HDPE) 和异性聚烯 (iPP) 兼容的有效性.
- 评估添加玻璃剂对混合物机械性能和微相稳定性的影响.
主要方法:
- 在HDPE/iPP混合物中加入1-5重量%的西洛-交联HDPE玻璃化物.
- 机械性能的表征,特别是断裂时的延长.
- 显微镜以确定域大小并评估微相稳定性.
- 在180°C的化研究以评估热稳定性.
主要成果:
- 玻璃剂兼容性显著增强了破裂时的延长,达到120%,而对照混合物中这一比例为22%.
- 观察到iPP域大小从0.9μm减少到0.4μm.
- 在高温回火过程中改善了混合物的微相稳定性.
结论:
- 一种特定的玻璃剂的小额添加有效地使不可混合的HDPE和iPP兼容.
- 这种基于玻璃体的方法提供了一种简单而有前途的方法来提高聚合物混合物的性能.
- 该方法在回收混合塑料废物和制造先进的聚合物复合材料方面具有广泛应用的潜力.
相关概念视频
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
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: Crystallinity
2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K
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: Ring-Opening Metathesis Polymerization (ROMP)
2.6K
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...
2.6K
Olefin Metathesis Polymerization: Overview
2.1K
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...
2.1K


