Methods for determination of plasticizer migration
2 Test methods for plasticizer migration In general, plasticizer migration from PVC synthetic materials can proceed via three different mechanisms, namely volatilization, exudation or extraction, depending on the environment where the PVC coatings are located.
Polyvinylchloride (PVC) and natural rubber films plasticized
In a glass beaker, 0.4 g of PVC K70 resin (Braskem, Brazil) was mixed with the natural plasticizer (30 wt% in relation to PVC resin) followed by the addition of 9 mL of tetrahydrofuran. The mixture was homogenized using a magnetic stirrer for 10 min at room temperature and then the solution was cast into a clean glass Petri dish (diameter 14 cm).
Migration of plasticizers from poly(vinyl chloride) and
The migration of DEHP in PVC grain exceeded the maximum regulated level of 5000 μg/kg, whereas the levels were much lower in films. In new PVC bags, DEHP was the only compound detected at 4.31 ± 0.5 μg/L in NaCl 0.9% and 4.29 ± 0.25 μg/L in glucose 5% serums, whereas the levels increased 10 times in three-year shelf-life bags.
Methods for determination of plasticizer migration
Plasticizer migration is responsible for premature coating failure in polyvinyl chloride (PVC) synthetic materials that continue to benefit our daily life as a reliable and cost-efficient simulant
Study of the migration of PVC plasticizers - ScienceDirect
Plasticizer migrated after this time, was determined by thermogravimetric analysis, in a Perkin-Elmer thermobalance, by heating the sample from 25 to 600 °C at 10 °C/min under a 20 ml (STP)/min flow of nitrogen. 3. Results and discussion Thermogravimetric study of different polystyrene samples reveals marked differences in the degradation process.
- Can plasticizers migrate from flexible PVC parts to other media?
- An accelerated method has been set up in order to study the capacity of migration of different commercial plasticizers from flexible PVC parts towards other media kept in contact with it; in this case, polystyrene (PS) has been used as example.
- Why is plasticizer migration a problem?
- The plasticizer migration from the plastic item to its surroundings may involve the appearance of problems, namely the modification of flexibility of the PVC and the contamination of the media in contact with PVC.
- How is plasticizer migration controlled?
- Thus, plasticizer migration is controlled by both diffusion coeffi- cients at the same time as by the mass transfer between both phases (PVC and polystyrene), given by a partition coefficient. Due to the fact that this is a non-lineal problem, it is necessary to use a numeric procedure, as for example the finite differences method.
- Do plasticizers migrate better than SML?
- Migration performance of conventional and new plasticizers were investigated. Distinct migration was due to different interactions between the plasticizers. Correlation between migration and tensile properties of the films was done. Most of commercial samples showed migration lower than SML established.
- Are phthalate and non-phthalate plasticizers used in flexible polyvinyl chloride (PVC) applications migrated?
- The aim of the present work is to provide information about the migration of phthalate and non-phthalate plasticizers generally used in flexible polyvinyl chloride (PVC) applications. Plastisols (pastes) were prepared by mixing PVC, plasticizer, and thermal stabilizer. The plasticized PVC (p-PVC) films are obtained by gelation at 160 C for 15 min.
- Does PVC film affect specific migration of plasticizers into aqueous acidic foods simulant?
- The samples of commercial PVC film displayed lower values of specific migration of plasticizers into aqueous acidic foods simulant than the quantification limit (LOQ) of the respective methods, even with concentration of approx. 40% in the formulation of the film ( Table 9 ).
