PHARMACEUTICALLY USED PLASTICIZERS: A REVIEW - ResearchGate
The mechanism of action of plasticizers is described, in terms of plasticization theory and the chemical modifications that occur during this process, which account for the excellent...
Plasticizer
Traditional lignosulfonate and naphthalene sulfonate-based plasticisers disperse the flocculated gypsum particles through a mechanism of electrostatic repulsion (see Colloid ). In normal plasticisers, the active substances are adsorbed on to the gypsum particles, giving them a negative charge, which leads to repulsion between particles.
Plasticizers - Walters - - Major Reference Works - Wiley
The article contains sections titled: 1 Introduction 1.1 Definition 1.2 Types of Plasticization 1.3 Types of Plasticizer 2 Plasticizers in Common Use 2.1. Ortho-Phthalate Esters 2.2 Terephthala...
Progress in bio-based plastics and plasticizing modifications
Several theories have been proposed to explain the mechanism and action of plasticizers on polymers. Among those theories, the following plasticizing mechanisms have been widely accepted to describe the effect of plasticizers on polymeric networks: 33–36 (a) the lubricity theory: this theory is similar to metal parts lubrication by oil.
Plasticizers: Materials, Action and Uses | Admixtures
The main action of plasticizers is to produce fluidity in the mix and improve the workability of concrete, mortar or grout. The mechanism of the process may be explained as follows: (i) Dispersion: Portland cement being very fine, its particles have a tendency to move and collect in pockets of the wet concrete forming bunch of particles.
- What is the mechanism of action of plasticizers?
- The mechanism of action of plasticizers is described, in terms of plasticization theory and the chemical modifications that occur during this process, which account for the excellent performance of some plasticizer molecules and the apparently poor softening ability of others.
- How do plasticizers affect lubricity?
- Plasticizer molecules swell the gel and facilitate the movement of polymer molecules, thus imparting flexibility. The lubricity and gel theories agree that plasticisers penetrate the structure of the polymer, separating chains and thus reducing intermolecular forces between them .
- How do plasticizers affect a polymer?
- Well-chosen plasticizers can also improve resistance to UV exposure and chemical attack. This contributes to the long-term stability of the polymer. In specific applications, plasticizers can influence the dielectric properties of polymers.
- What is a plasticizer & how does it work?
- A plasticizer is a substance the addition of which to another material makes that material softer and more flexible. Most often plasticizers are materials that, when added to a polymer, cause an increase in the flexibility and workability, brought about by a decrease in the glass-transition temperature, Tg, of the polymer.
- How are plasticizers released into the environment?
- The release of plasticizers into the environment can occur during various stages. These include manufacture, distribution, fabrication, product use, and disposal. Most releases occur during the process of incorporating plasticizers into the PVC polymer. 4
- What is plasticizer migration?
- Plasticizer migration refers to the undesired movement of a plasticizer outside a compound. The movement occurs through gas volatilization, liquid extraction, or solid migration. This phenomenon occurs when there is limited interaction between the polymer and the plasticizer.
