There is a direct relationship between resin viscosity and relative molecular weight; higher molecular weight leads to increased viscosity due to longer polymer chains. Resin viscosity is an important parameter in manufacturing as it affects processability, wetting of fibers, and final product quality and properties. Lower viscosity resins are preferred for ease of handling and uniform mold filling.
Dear all, in all its forms (relative , inherent, intrinsic) viscosity is related to MW in both linear and nonlinear modes. By definition, viscosity is the resistance to flow, so it becomes obvious that the larger/bulky is the molecule the higher will be the viscosity. In polymers, in addition to the concentration, two major interconnected parameters related to chain length dominate viscosity. These are the intermolecular cohesion (resulted from intermolecular forces) and entanglements (interchain physical knots). These defines the energy barriers for free flowing.
The viscosity of the resin determines the mixing time duration and shear level necessary for achieving good and homogeneous dispersion of additives. One missing information in the question statement, is about solution or melt viscosity the question is concerned by? My Regards
Thank you.
Reaching the MW level by controlling the extent of the synthesis of a pure resin. The MW level is increasing so the resin viscosity is increasing at the same time. The small molecules keep dissolving outside and staying in the region with few long chains. The MW level is higher for part of the chains and lower for the other part. Abdelhak Maghchiche
Sir,
I specialize solution viscosity as well as another parameter of solid content.
thank you sir.
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