The intrinsic viscosity of PEN chip subjected to solid state polymerization increased from 0 5 dL/g in the stage of melt polymerization to more than 0 7 dL/g.

• 通过固相聚合后 ；PEN切片的特性粘数可由熔融聚合的 0 .；5 d L/g提高到 0