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相关概念视频

Colloids03:22

Colloids

18.0K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloidal precipitates01:09

Colloidal precipitates

769
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
769
Coagulation01:06

Coagulation

380
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
380
Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
667
Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Synthesis and Characterization of Supramolecular Colloids
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溶性树脂作为pH响应的保护性合体

Mehdi Naderi1, Kiarash Farajzadehahary1, Timo Melchin2

  • 1POLYMAT and Department of Applied Chemistry, Faculty of Chemistry, University of the Basque Country UPV/EHU, Joxe Mari Korta Center, Avenida Tolosa 72, 20018 Donostia-San Sebastián, Spain.

ACS applied materials & interfaces
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概括

这项研究引入了一个新的pH值可切换稳定剂,用于乳液聚合物,使干燥的聚合物粉末的容易隔离和再乳化. 这项创新简化了建筑和涂料应用的存储和运输.

关键词:
在中溶解的树脂.乳液聚合物化的乳液.适应pH值的乳是一种耐磨乳.再分散的聚合物粉末.

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科学领域:

  • 聚合物化学 聚合物化学
  • 体科学 体科学 体科学
  • 材料科学 材料科学 材料科学

背景情况:

  • 乳化聚合物在粘合剂,涂料和建筑材料中至关重要.
  • 乳液聚合物的干燥形式提供了后勤优势,但需要有效的再乳化.
  • 现有的干聚合物隔离和再分散的方法可能具有挑战性.

研究的目的:

  • 为了研究一种可切换pH值的稳定剂,用于乳液聚合物.
  • 为了使低玻璃过渡温度 (Tg) 的聚合物颗粒能够得到控制的凝结和分离.
  • 为了成功地将聚合物重新稳定到乳液中.

主要方法:

  • 低Tg (14°C) 乙乙烯酸/VeoVa10颗粒通过种子半连续乳液聚合通过高Tg溶性树脂稳定合成.
  • 在pH≤3下进行乳凝结,然后进行过,干燥,研磨,并添加高作为抗凝剂.
  • 通过应用能量和增加pH值,在水中恢复分离的聚合物粉末的稳定.

主要成果:

  • 证明了干乳液聚合物粉末的成功隔离与完整性.
  • 通过调整pH值和应用能量,将分离聚合物重新分散成稳定的乳液.
  • 鉴定了含有碳素的性溶解树脂作为有效的pH值可切换稳定和颗粒保护.

结论:

  • 一个新的pH可切换稳定系统允许有效地隔离干粉和重新乳化乳液聚合物.
  • 使用由溶性树脂制成的硬在加工过程中保护低Tg颗粒.
  • 这种方法提高了乳液聚合物的实用性,在需要干燥储存和易于重新应用的应用中.