Long-term durability assessment of PVC-P waterproofing
Plasticizer loss was determined as the difference between the two measurements. The loss is expressed by the residual plasticizer content ( C P) or by the plasticizer loss ratio ( P L) ( Benneton, 1994) as follows: P L t = M P 0 - M P t M P 0, where M P 0 is the initial mass of plasticizer and M P the mass at time t.
Evaluating Plasticizer Loss In PVC Membranes - EPI
The rate of loss of plasticizer depends on plasticizer type, temperature, sheet thickness and exposure time. The actual mechanism behind this loss is evaporation of plasticizer from the surface of the membrane. Therefore, for highly plasticized PVC, as in this case, the rate of plasticizer loss is dependent on the surface area. Figure (1) shows
Long-term durability assessment of PVC-P waterproofing
Plasticizer loss is the main phenomenon affecting the durability of PVC membranes. A device for accelerated ageing tests on PVC membranes has been developed. Mechanical tests are performed to study the time-dependent properties of membranes. Plasticizer loss with time has been modelled from plasticizer absorption tests data.
Methods for determination of plasticizer migration
The exudation of plasticizers is quantified by the arithmetic means of the changes in mass of either the specimens or the absorbent backing discs. Scheme 2 Specimen arrangement as described in ISO 177:2016 (E) that evaluates the exudation tendency of plasticizers from PVC coatings into other materials when they are brought into close contact
Plasticizer Effects in the PVC Membrane of the Dibasic
The following compounds were evaluated as plasticizers in the sensor membrane: N, N -dimethyformamide (DMF), 2-nitrophenyloctyl ether (NPOE), dibutylphthalate (DBP), tris (2-ethylhexyl)phosphate (TEHP), dibutylsebacate (DBS), and bis (2-ethylhexyl)sebacate (BEHS) were all used as purchased (Fluka Chemical Corp., Ronkonoma, NY, USA).
- Does plasticizer loss affect the durability of PVC membranes?
- Plasticizer loss is the main phenomenon affecting the durability of PVC membranes. A device for accelerated ageing tests on PVC membranes has been developed. Mechanical tests are performed to study the time-dependent properties of membranes. Plasticizer loss with time has been modelled from plasticizer absorption tests data.
- Does plasticizer loss occur in moist environments?
- Plasticizer loss is shown to be minimal in either moist or exposed environments. Membrane usefulness is not affected by the loss that does occur. Polyvinyl chloride (PVC) and PVC alloys have been used extensively for many years for containment. In fact, a number of sites decades old still have functional PVC liners.
- What is the rate of loss of plasticizer?
- The rate of loss of plasticizer depends on plasticizer type, temperature, sheet thickness and exposure time. The actual mechanism behind this loss is evaporation of plasticizer from the surface of the membrane. Therefore, for highly plasticized PVC, as in this case, the rate of plasticizer loss is dependent on the surface area.
- Can accelerated ageing tests be performed on PVC membranes?
- A device for accelerated ageing tests on PVC membranes has been developed. Mechanical tests are performed to study the time-dependent properties of membranes. Plasticizer loss with time has been modelled from plasticizer absorption tests data. The end-of-life time of the two commercial PVC membranes is evaluated. 1. Introduction
- How does plasticizer loss affect geomembranes?
- A comparison of the aged geomembranes with the original commercial ones did not reveal a clear pattern of variation in the properties caused by plasticizer loss. This is because the ageing tests resulted in a loss of maximum 4% of plasticizer, which is not enough to clearly introduce changes in mechanical behaviour.
- Do PVC liners lose plasticizer?
- Over the past few years, however, concerns have arisen over these liners and the loss of plasticizer under exposed and unexposed or buried conditions. PVC liner production involves mixing or blending PVC resin, stabilizers, plasticizers and pigments. The plasticizer softens the polymer to make it pliable.
