Effect of thermo-oxidation on loss of plasticizers, on
The results show that chemical changes associated with this degradation process hinder formation of the orthorhombic γ crystalline lattice and postpone the overall crystallization capability. Accordingly, the final features in the film surface and the mechanical response are significantly affected by degradation time.
Effect of thermo-oxidation on loss of plasticizers, on
Plasticizers loss is assessed under severe thermo-oxidative conditions in a metallocene iPP. Degradation time of remaining content depends strongly on the plasticizer incorporated. Alterations along the loss of plasticizer and antioxidant are observed in the iPP microstructure.
Effect of thermo-oxidation on loss of plasticizers, on
plasticizers into an isotactic metallocene polypropylene (iPP) to evaluate its loss as a function of time by the action of thermo-oxidative treatment at 95 °C, and to comprehensively understand how degradation and plasticizer consumption affect the chemical details in the iPP, its crystalline characteristics, the
Effect of thermo-oxidation on loss of plasticizers, on
DOI: 10.1016/j.polymer.2025.121749 Corpus ID: 202968449; Effect of thermo-oxidation on loss of plasticizers, on crystalline features and on properties in a metallocene isotactic polypropylene
Effect of thermo-oxidation on loss of plasticizers, on
Incorporation of a low content of several plasticizers into a metallocene isotactic polypropylene (iPP) has been performed in order to learn about their stability and performance by the action of a thermo-oxidative degradation treatment at 95 °C for different times. Comparison with the behavior exhibited by the material with di(2-ethylhexyl) phthalate (DEHP) is established for a feasible
- Does plasticizer loss affect pp degradation?
- It can be observed that there is practically no effect on the main PP degradation, since the plasticizer is lost first (as clearly depicted in Fig. 4 ). Anyway, a small but appreciable stability increase is visible in the case of PP-TOTM. Fig. 3. TGA curves for the different samples.
- How does oxidation chemistry affect the degradation rate of a polymer?
- During processing and in-use, the stabilizer concentration reduces, implying that the rate of evaporation of the stabilizer can determine the degradation rate for the virgin polymer, while after recycling the oxidation chemistry becomes a crucial factor.
- Does evaporation affect plasticiser loss rate?
- First, there is the case where the plasticiser loss rate is constant, at least over a certain time-period (observed as the linear loss as a function of time at 90 °C in Fig. 4b), meaning that the loss is strongly limited by the evaporation process.
- Does metallocene IPP lose plasticizers?
- Plasticizers loss is assessed under severe thermo-oxidative conditions in a metallocene iPP. Degradation time of remaining content depends strongly on the plasticizer incorporated. Alterations along the loss of plasticizer and antioxidant are observed in the iPP microstructure.
- Does loss of plasticiser lead to a gas phase saturated with plasticiser?
- It is assumed that the loss of plasticiser does not lead to a gas phase saturated with plasticiser, hence a case where the surrounding environment is a large/infinite volume of gas/air/vacuum or where there is a gas flow over the surface (Ce = 0). A dimensionless ratio can be used to assess which mechanism dominates the loss kinetics: F × L / D.
- How to reduce plasticiser loss?
- The most common way is to increase the molecular size of the plasticiser, which can be achieved by using polymeric plasticisers and oligomers, 64, 65 and branched and star-shape plasticisers. 66, 67, 68 The diffusivity of these plasticisers in polymers is low due to their large size, leading to slow plasticiser losses.
