Gelation process molecular size distribution

Step 2 A temperature is reached (70-90°C), at which interactions between PVC particles and plasticizer begin, prodncing an increase in modnlns and viscosity dne to the plasticizer adsorption in PVC particles and the snbseqnent PVC dissolntion. This step, known as gelation, can be observed as more than one process. This depends on concentrations of the plasticizer and PVC resin and its type, as shown in Figures 10.26. In this case, different partiele sizes or molecular weight distributions of PVC can be responsible for different interactions or dissolution rates in plasticizers. 

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