Plasticizers function by embedding between polymer chains to increase flexibility
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Reference literature reports that smaller molecules of plasticizers embed themselves between polymer chains to increase spacing and chain mobility, functioning to increase the material's flexibility.
addition of plasticizers into the polymer matrix. Smaller molecules of plasticizer embed themselves between the polymer chains, increasing the spacing
The glass–liquid transition, or glass transition, is the gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a viscous or "rubbery" state as the temperature is increased. An amorphous solid that exhibits a glass transition is called a glass. The reverse transition, achieved by sup
In ironing, a fabric is heated through this transition so that the polymer chains become mobile. The weight of the iron then imposes a preferred orientation. Tg can be significantly decreased by addition of plasticizers into the polymer matrix. Smaller molecules of plasticizer embed themselves between the polymer chains, increasing the spacing and free volume, and allowing them to move past one another even at lower temperatures. Addition of plasticizer can effectively take control over polymer chain dynamics and dominate the amounts of the associated free volume so that the increased mobility of polymer ends is not apparent. The addition of nonreactive side groups to a polymer can also make the chains stand off from one another, reducing Tg. If a plastic with some desirable properties has a Tg that is too high, it can sometimes be combined with another in a copolymer or composite material with a Tg below the temperature of intended use. Note that some plastics are used at high temperatures, e.g., in automobile engines, and others at low temperatures.
plasticizers, i.e., substances added to polymers to increase their flexibility, transparency, durability, and longevity. They are used primarily to soften
Phthalates (US: UK: ), or phthalate esters, are esters of phthalic acid. They are colorless, odorless, oily compounds, although commercial samples can be yellowish with faint odors. Being fairly chemically inert and easily produced, they are widely used as plasticizers, i.e., substances added to polymers to increase their flexibility, transparency, durability, and longevity. They are used primar
Phthalates (US: UK: ), or phthalate esters, are esters of phthalic acid. They are colorless, odorless, oily compounds, although commercial samples can be yellowish with faint odors. Being fairly chemically inert and easily produced, they are widely used as plasticizers, i.e., substances added to polymers to increase their flexibility, transparency, durability, and longevity. They are used primarily to soften polyvinyl chloride (PVC). While phthalates are commonly used as plasticizers, not all plasticizers are phthalates. The two terms are specific, unique, and not used interchangeably.
The use of phthalate plasticizers has had a profound effect on the commercialization of PVC, promoting its use for major industrial and consumer applications where flexibility is required, such as for tubing, siding, packaging and wire sheathing.
Phthalates are controversial because, when ingested, they pose a threat as endocrine disruptors. Consequently their use is regulated, e.g. in the United States, Canada, and European Union.
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