1、聚乙烯醋酸乙烯酯_化工百科
EVA是乙烯和醋酸乙烯的无规共聚物，由于在乙烯链中引入了具有极性的醋酸基团所形成的短支链，改变了原来的结晶状态，使得EVA较聚乙烯更富有柔韧性和弹性。 EVA树脂的性能与醋酸乙烯的含量和熔体流动速率有关，当MFR一定时，与醋酸乙烯含量的增高，其弹性、柔韧性、相容性和透明性等均有所提高，结晶度下降；而随着醋酸乙烯含量的降低，则性能接近于聚乙烯，刚性增大、耐磨性和电绝缘性能提高。 若醋酸乙烯含量一定，当MFR增加时，则软化点下降，加工性和表面光泽得到改善，但力学强度有所下降；反之，随着MFR的降低，则分子量增大，冲击性能和耐应力开裂性能有所提高。 EVA常作为改性剂与其他聚合物共混，这是由于EVA具有良好的挠曲性、 …
2、Low
LDPE and EVA could improve the elastic performance and deformation resistance of asphalt. Waste low-density polyethylene (LDPE) and ethylene–vinyl acetate (EVA) are two materials with low recyclability and slow degradation in the environment, which causes extreme pollution to the environment.
3、Characterization of Low
Low-density polyethylene (LDPE) and ethylene vinyl acetate copolymer (EVA), which are non-polar and polar polymers, are immiscible and form a polyphase system.
Synthesis of Degradable Polyethylene and Poly(ethylene
We report the synthesis of PE and poly (ethylene- co -vinyl acetate) (EVA) bearing a low content of in-chain thioester functions introduced via a co- or terpolymerization approach involving ethylene (E), vinyl acetate (VAc), and ε-thionocaprolactone (TCL).
埃洛石
To address the drawbacks, a dual inorganic filler system was constructed by combining the traditional inorganic flame-retardant aluminum hydroxide (ATH) and the halloysite nanotube (HNT) and introduced to ethylene vinyl acetate copolymer-polyethylene (EVA-PE) composite.
Investigation of the Properties of Polyethylene and Ethylene
In this regard, blends of PE and ethylene-vinyl acetate copolymer (EVA) of various compositions were investigated for 3D printing. It was found that with an increase in the concentration of EVA, an increase in the pseudoplastic effect and amorphization of PE occurs.
Hansen solubility parameter: from polyethylene and poly(vinyl acetate
The Hansen solubility parameters (HSPs) of two ethylene–vinyl acetate (EVA) copolymers (with 18 and 33 wt% of vinyl acetate) and their corresponding homopolymers (polyethylene, PE, and poly (vinyl acetate), PVAc) have been studied at various temperatures, employing the previously obtained Flory–Huggins parameters.
Adhesion Properties of Polyethylene and Ethylene
It has been established that the strength of the adhesive contact with steel of an ethylene-vinyl acetate copolymers with ethylene-acrylate copolymers blend is significantly (1.6–4.8 times) higher than the additive values, which makes them promising for practical use as adhesives.
Rheology, morphology and mechanical properties of polyethylene/ethylene
Rheology, morphology and mechanical properties of binary PE and EVA blends together with their thermal behavior were studied.
Physical Properties of Polyethylene and Ethylene Vinyl Acetate Foam
Previous studies on the physical properties of each Polyethylene (PE) or Ethylene Vinyl Acetate (EVA) foam have been widely reported. The current challenge is how to understand the combination of PE and EVA foam in order to obtain appropriate properties in various applications.
Polyethylene and Ethylene Vinyl Acetate: A Revolution in Polymeric Materials
In the rapid development of modern industry, polymeric materials have played an indispensable role. With their unique physical and chemical properties, they serve critical functions across numerous fields. Polyethylene (PE) and ethylene vinyl acetate (EVA) are two common polymeric materials, each possessing distinct characteristics and applications that have driven revolutionary transformations in modern industry.
Polyethylene is a thermoplastic plastic synthesized from ethylene monomers via polymerization. It exhibits excellent mechanical properties, chemical resistance, and electrical insulation. Its molecular structure maintains a solid state at room temperature but softens or melts at specific temperatures. Widely used in packaging, agricultural films, pipelines, and cables, polyethylene is favored for its superior tensile strength, wear resistance, and impact resistance.
polyethylene has limitations. For instance, its thermal stability is poor, as it degrades at high temperatures. Additionally, its water resistance and chemical resistance are relatively weak, restricting its use in certain specialized applications. To address these shortcomings, scientists continually explore modification methods, such as copolymerization and cross-linking, to enhance its performance.
Ethylene vinyl acetate (EVA) is a thermoplastic elastomer copolymerized from ethylene and vinyl acetate. Combining the elasticity of rubber with the processability of plastics, it is often called "synthetic rubber." The presence of numerous polar groups in its molecular structure allows EVA to expand while retaining shape after absorbing water, mimicking rubber’s elastic properties. its low melting point facilitates easy processing, making it widely applicable in textiles, footwear, and packaging materials.
EVA demonstrates stronger water resistance than polyethylene, maintaining performance in humid environments. It also exhibits robust chemical resistance against acids, alkalis, salts, and other substances, positioning it for broad applications in industries such as chemicals, petroleum, and textiles.
Nevertheless, EVA has drawbacks. Its thermal stability is limited, leading to degradation at high temperatures. Additionally, its higher hardness requires greater pressure and temperature during processing. To improve EVA’s performance, researchers investigate modifications like adding plasticizers or incorporating other polymers to optimize usage outcomes.
In practice, combining polyethylene and EVA through compounding often yields superior composite materials. For example, blending EVA with PE creates a novel material that integrates PE’s high strength with EVA’s exceptional elasticity. Such composites not only enhance mechanical properties but also improve processability and environmental adaptability.
polyethylene and ethylene vinyl acetate, as two pivotal polymeric materials, continue to expand their applications in modern industry. With ongoing scientific and technological advancements, these materials are poised for deeper research and development, promising greater innovation and value for human society.
