Mathematical modelling of plasticizer migration and accompanying
Mathematical model manifested that the migration mechanism of plasticizer obeyed the first-order kinetic model, and the migration of plasticizer followed the Fick’s second law in the...
Mathematical modelling of plasticizer migration and accompanying
Mathematical models analysis The overall kinetic and the diffusion model were used to analyze the migration of plasticizer. First, the migration of triacetin was initially analyzed for first-order kinetic model (Eq.
Mathematical modelling of plasticizer migration and accompanying
Mathematical model manifested that the migration mechanism of plasticizer obeyed the first-order kinetic model, and the migration of plasticizer followed the Fick’s second law in the short-term migration.
Methods for determination of plasticizer migration from polyvinyl
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 of genuine leather. In this context, the establishment of standard assays that measure the migration rate of plasticizers under varying scenarios plays a pivotal role in comparing durability of those
Simulation for the migration of nitrate ester plasticizers in different
In the present work, nitroglycerin (NG) and 1,2,4-butanetriol trinitrate (BTTN) were used as the model plasticizers to explore the factors affecting the migration of plasticizers into three different liners including polyoxyethylene (PEG)/polyisocyanate (N-100), hydroxyl-terminated polybutadiene (HTPB)/isophorone diisocyanate (IPDI) and polydimethylsiloxane (PDMS)/tetraethoxysilane (TEOS) by
- Can molecular simulations predict plasticization of polymers?
- A molecular simulations methodology was developed to be able to predict plasticization of polymers (tested here on a complex system; thermoplastic starch). The methodology, and the simulated systems, were evaluated against experimental density, glass-transition data and mechanical properties.
- How many theories are there on plasticizer mechanisms?
- There are four different theories on plasticizer mechanisms [ , , , , , , , , , , , ]; the lubricity, gel, free volume and mechanistic theories.
- Can plasticizer percolation cause a transition region?
- In the simulations, it was possible to observe the transition region where plasticization occurs experimentally (20–30 wt.% plasticizer). Plasticizer percolation was suggested as a possible cause for the occurrence of the transition region.
- Does plasticization occur experimentally?
- The methodology, and the simulated systems, were evaluated against experimental density, glass-transition data and mechanical properties. In the simulations, it was possible to observe the transition region where plasticization occurs experimentally (20–30 wt.% plasticizer).
- Why does plasticization occur within 20 wt% plasticizer/glycerol?
- Although the properties, e.g., the modulus, are usually reported as a function of plasticizer content, the mechanisms leading to plasticization are generally not discussed, nor the reason why sufficient plasticization often occurs within the region of 20–30 wt% plasticizer/glycerol [ 5 ].
- Does glycerol plasticization efficiency increase in a transition region?
- The transition region The glycerol plasticization efficiency increased distinctly in a transition region between a glycerol content of 20 and 30 wt% (weight fraction: ϕwt = 0.2–0.3), corresponding to a glycerol volume content of 22–33 vol% (volume fraction: ϕ vol = 0.22–0.33), neglecting the presence of water.
