The [M.sub.n] and [M.sub.w] of the obtained polyesters were calculated from the molecular weight distribution
measured using the aforementioned procedure.
The difference between success and failure can hinge on the implications of molecular weight, molecular weight distribution
, and crystalline/amorphous structure.
The macromonomer has a molecular weight distribution
such that its ratio of Mw/Mn is at least 1.25, wherein the Mw is the weight average molecular weight of the macromonomer and the Mn is the number average molecular weight of the macromonomer.
Such variables include glass transition temperature, functionality, backbone monomer composition, colloidal stabilization mechanisms, particle size and morphology, molecular weight distribution
, degree of branching, and crosslinking.
It is an officially recognized method for determining the molecular weight distribution
of polymers by the plastics industry.
The materials group helps foundries meet product specifications and test quality through mechanical, thermal and cure tests; molecular weight distribution
tests; rheological properties tests; and long-term durability tests.
Combined with a broad molecular weight distribution
, its low molecular weight is also responsible for its unusually low viscosity at higher temperatures.
The number average molecular weight ([M.sub.n]), weight average molecular weight ([M.sub.w]), Z-average molecular weight ([M.sub.z]), Z + 1 average molecular weight ([M.sub.z+1]), and polydispersity indices ([M.sub.w]/[M.sub.n], [M.sub.z]/[M.sub.w]) were reported to characterize the molecular weight distribution
. Three lots were sampled for each PEEK resin and grade.
Because of its ease-of-use and wide applicability, GPC has been a reliable and integral component of the polymer development process for decades, providing molecular weight distribution
data for the development and control of product performance.
It measures absolute molecular weight, molecular weight distribution
and polymer chain branching in a single experiment.
Various producers have tried to improve on this using multi-modal technologies to tailor molecular weight distribution
and achieve specific properties in the material.