During the PVA process,gel effect will occur and restrict the production PVA of high polymerization degree when the viscosity of material in polymerization autoclave reach a certain value.

• 聚乙烯醇生产过程中,当反应体系黏度达到一定值时,会产生"凝胶效应",从而制约高聚合度产品的生产。