Polymerization of Para-xylylene Derivatives (parylene Polymerization) IV

The effect of the sublimation rate of di-p-xylylene on the crystallinity and morphology of Parylene N deposited on stainless steel was studied as a function of substrate temperature. Solution annealing resulting from solvent extraction, and isothermal annealing, increase the crystallinity of the polymers and result in structures containing both alpha and beta polymorphs. the surface topology, as revealed by scanning electron microscopy (SEM), for polymers synthesized from RT to minus 40 degree C shows a globular structure, whereas low temperature samples exhibit a rod-type morphology. the polymer synthesized at liquid nitrogen temperature shows the presence of voids along with different morphologies