THEORETICAL MODEL FOR THE GELATION AND FUSION MECHANISMS OF PVC
Some plastisols of PVC with different concentrations of plasticizer have been used to study the influence of concentration in the gelation and fusion mechanisms. The data obtained have been used to prove the validity of the theoretical model, and obtain its characteristic parameters.
Effect of plasticizer type on gelation and fusion of PVC plastisol
In the gelation stage the resin particles become swollen with plasticizer and then, in the fusion stage the entire system fuses to become one homogeneous phase. The finished products are flexible PVC such as coated fabrics and surgical globes.
Dependence of Gelation and Fusion Behavior of Poly(vinyl chloride
This paper explores the effect of the particle size distribution on the gelation and fusion behavior. For this purpose a commercial PVC resin was air-classified into fractions of different
Rheology and gelation kinetics of PVC plastisols | SpringerLink
As PVC plastisol mainly consists of plasticizer(s) and PVC resin(s), many authors studied the influence of the concentration, type of plasticizers and resins on gelation process. Nakajima and Daniels ( 1980 ) showed that the rate of the gelation process is controlled by the size, size distribution and shape of PVC particles and by the molecular weight and the crystallinity of the resins.
RHEOLOGICAL STUDY OF PVC PLASTISOLS DURING GELATION AND FUSION
In the majority of transformation processes, PVC plastisols are coated in a substrate or a mould, and then heated in a oven at about 180–200°C. During this process, the plastisol undergoes two processes known as gelation and fusion. In the gelation step, the plasticizer diffuses into particles of PVC.
- Does plasticizer concentration affect gelation and fusion of PVC plastisols?
- The influence of plasticizer concentration in the processes of gelation and fusion of PVC plastisols has been studied by viscoelastic oscillatory tests.
- What is the gelation temperature of PVC/DINP-CD plastisols?
- As can be seen Fig. 5, complete gelation of the PVC/DINP-CD plastisols occurred at 158 °C, a gelation temperature that was slightly higher than that of the PVC/DINP plastisol (150 °C). Gelation of the PVC plastisols was delayed upon addition of Bz- β -CD particles, possibly because of the decreased interaction of the PVC with the plasticizer.
- Why is PVC plastisol gelation delayed?
- Gelation of the PVC plastisols was delayed upon addition of Bz- β -CD particles, possibly because of the decreased interaction of the PVC with the plasticizer. In the Neocizer series, the gelation point of the PVC/Neo-CD plastisol was 169 °C, slightly higher than the gelation point of the PVC/Neo plastisol (162 °C).
- Do Plastisol concentrations affect gelation and fusion mechanisms?
- Some plastisols of PVC with different concentrations of plasticizer have been used to study the influence of concentration in the gelation and fusion mechanisms. The data obtained have been used to prove the validity of the theoretical model, and obtain its characteristic parameters. 3. EXPERIMENTAL 3.1. Sample
- How does Plastisol fusion work?
- During this process, the plastisol undergoes two processes known as gelation and fusion. In the gelation step, the plasticizer diffuses into particles of PVC. These start to swell and dissolve in the plasticizer. PVC contains small crystallites with a range of sizes and degrees of perfection.
- What is the process of gelation of a PVC plastisol?
- The process of gelation of a PVC plastisol can be described as a process in which a liquid suspension of PVC resin with plasticizer becomes a solid material with elastomeric properties by being heated at an adequate temperature (Lopez et al. 2003). This process takes place in different stages.
