Explanation
In the three-dimensional polycondensation system, the multi-functional monomer starts crosslinking when polymerization reaches a certain degree, viscosity suddenly increases, and gel occurs. The degree of reaction at this time is called gel point. The gel point is the critical reaction degree at the moment when gel begins to appear, or the corresponding temperature, time and other parameters when gel begins to appear. In the gel stage, the crosslinking point between the polymer molecular chains increases rapidly on the micro level, and the viscosity of the resin starts to increase rapidly on the macro level, so the gel point can be measured by the turning point of the viscosity time (or temperature) curve. The gel time depends on the chemical composition, reaction degree and curing conditions of resin. It is an important indicator for formulating the molding process parameters of composite materials products, especially the key basis for determining the pressure time of composite materials curing molding.
Classification
Organic polymer materials -> Polymer Science -> Polymer Physics
Composites -> Polymer matrix composite materials and processes -> Laminates and prepregs