Chloe Zhang
Plasticizers are substances that are added to materials, usually polymers, to make them more flexible, durable, and easier to handle. They are commonly used in PVC-based products, such as electrical cables, toys, and medical devices, to enhance their softness and flexibility. In the context of drugs, plasticizers are incorporated into drug delivery systems to optimize drug release and improve the overall performance of the delivery mechanism. Different drugs and plasticizers can be combined to tailor drug release rates, erosion, and mechanical properties of the delivery films. The concentration of plasticizers is crucial in drug formulations as it affects the strength of coating films, the integrity of drug products, and drug release characteristics.
| Characteristics | Values |
|---|---|
| Definition | A substance that is added to a material to change its physical properties |
| Types | Resins/polymers, small molecules, liquids with low volatility, solids |
| Materials Used With | Polymers, plastics such as PVC, clays, stucco, solid rocket fuel, pastes, concrete formulations |
| Function | Makes materials more flexible, resilient, softer, easier to handle, long-lasting, less viscous, and more stable |
| Common Types | Phthalates, DEHT, DINP, DIDP, DEHP |
| Use Cases | Electrical cables, toys, footwear, packaging, medical devices, paints, rubber products, adhesives, cosmetics |
| Global Market | 7.5 million metric tons in 2017 |
| North American Market | 1.01 million metric tons in 2017 |
| European Market | 1.35 million metric tons in 2017 |
| Pharmaceutical Role | Improve flexibility, endurance, resistibility, and stability of drug formulations |
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What You'll Learn
- Plasticizers improve flexibility, viscosity, softness, friction level and plasticity of materials
- Plasticizers are used in medical devices such as tubing and blood bags
- Plasticizers are used in drug delivery systems containing a variety of ingredients
- Plasticizers can be resins/polymers or small molecules, often in a liquid state
- Plasticizers are used in a variety of PVC-based products
Plasticizers improve flexibility, viscosity, softness, friction level and plasticity of materials
Plasticizers are substances that are added to a material, usually a polymer, to improve its flexibility, viscosity, softness, friction level, and plasticity. They are commonly added to polymers and plastics, particularly polyvinyl chloride (PVC), to make them more flexible and easier to handle during the manufacturing process. PVC is hard and brittle without plasticizers, but with them, it can be used for products such as vinyl siding, roofing, vinyl flooring, plumbing, and electrical wire insulation.
Plasticizers work by embedding themselves between polymer chains, increasing the free volume and reducing intermolecular forces, which enhances flexibility, softness, and elongation. The type and concentration of plasticizer used can be adjusted to achieve the desired material characteristics. For example, the viscosity of viscoelastic fluids can be easily adjusted by the type of plasticizer used and its concentration. Plasticizers can also improve the flow properties of a blend by reducing viscosity and enhancing the dispersion of fillers in the matrix.
The most commonly used plasticizers are phthalates, which are produced in large quantities in Western Europe. Other commonly used plasticizers include di-iso-nonyl phthalate (DINP), di-iso-decyl phthalate (DIDP), and di(2-ethylhexyl) phthalate (DEHP). Plasticizers are also used in medical applications, such as medical tubing and blood bags, to ensure softness and flexibility for optimum patient treatment and comfort.
While plasticizers offer many benefits, there are concerns about the safety of some polymer plasticizers, particularly low molecular weight ortho-phthalates, which have been associated with potential endocrine disruption and developmental toxicity. Additionally, inappropriate use of plasticizers may lead to issues such as film cracking, splitting, and peeling. Therefore, it is crucial to select the right type and amount of plasticizer to achieve the desired properties without compromising safety.
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Plasticizers are used in medical devices such as tubing and blood bags
Plasticizers are substances that are added to materials, usually polymers, to make them more flexible, resilient, and easier to handle. They are commonly added to plastics such as PVC, to facilitate the handling of the raw material during fabrication, or to meet the demands of the end product's application. Polyvinyl chloride (PVC) is the third most widely used plastic and is often used in medical devices.
PVC-containing plasticizers are used for the production of medical devices such as medical tubing and blood bags. Softness and flexibility are crucial properties of medical devices, especially for tubing that goes inside the body, which must be as soft as possible for optimum patient treatment and comfort. Plasticizers are added to PVC compounds to make them soft and flexible.
The use of PVC in healthcare is expected to grow in the coming years, as it is praised by R&D departments and the wider medical device community for its unique technical properties. It is also very cost-effective. Forecasts show that PVC will remain the material of choice for a range of existing life-saving medical applications, including tubing and containers, especially blood bags.
The development of plastics in the 1930s, 1940s, and 1950s enabled the development of medical devices that eventually replaced traditional materials such as glass intravenous (IV) bottles, rubber tubing, and metal operating room instruments. The first plastic blood bag, for example, was developed as a prototype in 1947 and used experimentally in the Korean War, where it proved its worth by withstanding being dropped from the air.
There are, however, concerns about the safety of some polymer plasticizers, especially low-molecular-weight ortho-phthalates, which have been classified as potential endocrine disruptors with some developmental toxicity reported.
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Plasticizers are used in drug delivery systems containing a variety of ingredients
Plasticizers are substances that are added to materials to make them softer, more flexible, and easier to handle. They are commonly added to polymers and plastics, such as polyvinyl chloride (PVC), to improve their flexibility and processability. In the context of drug delivery systems, plasticizers play a crucial role in enhancing the flexibility and resilience of the delivery mechanism, such as membranes or coatings.
The choice of an appropriate plasticizer for drug delivery systems is essential due to the variety of ingredients and their potential interactions with the plasticizer. Different ingredients may have distinct reactions to the presence of a plasticizer, influencing the overall performance of the drug delivery system. The mechanism of action of plasticizers involves chemical modifications during the plasticization process, which can result in varying softening abilities and other functional outcomes.
Phthalates, such as dioctyl terephthalate (DEHT), di-iso-nonyl phthalate (DINP), di-iso-decyl phthalate (DIDP), and di(2-ethylhexyl) phthalate (DEHP), are commonly used plasticizers in pharmaceutical applications. These phthalates are effective in improving the mechanical properties of films used in drug delivery, such as mechanical strength and moisture content. They are also utilised as coating materials to overcome limitations associated with the wide range of pH values and enzymes present in the gastrointestinal tract.
The concentration of plasticizers is critical in drug delivery systems. Typically, plasticizers are used within a specific concentration range, such as 0–20% w/w of dry polymer weight. Inappropriate use of plasticizers or exceeding the recommended concentration can lead to issues such as film cracking, splitting, or peeling. Additionally, certain plasticizers may impact the absorption rate of the drug, underscoring the importance of careful selection and regulatory compliance.
The selection of a plasticizer for a drug delivery system involves considering various factors, including the desired flexibility, shock resistance, and smoothness of the system. The stability of the dosage form, processing requirements, and in vivo performance are also crucial factors in the selection process. Water uptake and water permeation studies are conducted to understand their effects on drug release characteristics. Overall, plasticizers play a vital role in drug delivery systems by enhancing flexibility, modifying drug release profiles, and ensuring the desired performance of the delivery mechanism.
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Plasticizers can be resins/polymers or small molecules, often in a liquid state
Plasticizers are substances that are added to materials, usually polymers, to make them more flexible, resilient, and easier to handle. They are commonly used in the production of plastics, such as polyvinyl chloride (PVC), to improve their flexibility, viscosity, softness, friction level, and plasticity. These plasticizers are often resins/polymers or small molecules, typically in a liquid state, and they form secondary bonds with the polymer chains, spreading them apart.
There are more than 300 different types of plasticizers, with 50-100 in commercial use. They are classified according to their chemical composition, with each type possessing unique properties that can be transferred to base polymers, making them suitable for specific applications. Plasticizers can be liquids with low volatility or solids, and their compatibility with the host material is crucial. For example, phthalate esters are commonly used in PVC due to their excellent compatibility, low toxicity, and non-volatility.
The use of plasticizers in polymers can improve the handling of the raw material during fabrication and meet the demands of the end product's application. For instance, plasticizers are added to concrete formulations to reduce the water content, making the concrete stronger and more fluid for pouring. Similarly, in the case of PVC, plasticizers transform it from a hard and brittle material to a flexible and durable one, suitable for products like vinyl flooring, electric wire insulation, and medical devices such as tubing and blood bags.
The choice of plasticizer depends on various factors, including the desired functionality and the potential reactions with other ingredients in the drug delivery system. In drug delivery systems, plasticizers can affect the drug release rate, with increased plasticizer concentrations leading to decreased drug release in some cases. Additionally, certain drugs can act as plasticizers themselves, influencing the mechanical and swelling properties of the delivery system.
The safety of plasticizers has been a concern, especially regarding their potential endocrine disruption and developmental toxicity. Regulatory organizations, such as REACH, have evaluated the environmental and health impacts of plasticizers, leading to a move away from certain types, such as low molecular weight ortho-phthalates.
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Plasticizers are used in a variety of PVC-based products
PVC is a widely used plastic that, in its raw form, is hard and brittle. Plasticizers are added to PVC to increase its flexibility, workability, and distensibility. They reduce melt viscosity during processing, making the material easier to shape and mold. The most common plasticizers used with PVC are phthalates, which are low-volatility liquids or solids. However, due to environmental and health concerns, the use of phthalates has been restricted in many countries.
The introduction of a secondary plasticizer to a PVC blend can result in synergistic interactions that improve the final product's properties, such as migration resistance and mechanical properties. Primary plasticizers are typically small molecules that provide good plasticization efficiency but have a tendency to migrate due to their high volatility. On the other hand, secondary plasticizers have lower compatibility and may exude if used alone, but they can be combined with primary plasticizers to reduce costs.
The choice of plasticizer is essential, as it can affect the performance and softening ability of the polymer. The chemical compatibility between the polymer and plasticizer is crucial, especially in applications such as drug delivery systems, where the interaction between the two can impact the absorption rate of the drug. Overall, plasticizers play a vital role in modifying the characteristics of PVC to make it suitable for a diverse range of products.
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Frequently asked questions
A plasticizer is a substance that is added to a material to make it softer and more flexible, to increase its plasticity, and to decrease its friction during handling.
Plasticizers are added to drugs to improve their flexibility, viscosity, softness, and plasticity. They are also used to decrease friction during the handling of the drug.
Some commonly used plasticizers include phthalates, fatty acid esters, dicarbonates, and phosphates. Phthalates are the most commonly used plasticizers due to their compatibility with PVC.
Plasticizers are added to polymers and work themselves into the polymer chains, acting like a buffer between the segments of molecules. This helps to improve the flexibility and durability of the material.
There have been substantial concerns over the safety of some polymer plasticizers, especially low molecular weight ortho-phthalates, which have been classified as potential endocrine disruptors. However, the Registration for Evaluation, Authorisation, and Restriction of Chemicals (REACH), a strict safety regulating organization, has evaluated the safety of plasticizers.
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