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.
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- 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