Effect of photosensitizer content on the properties of PSPI thin films
To investigate the effect of photosensitive activator on the performance of photosensitive polyimide(PSPI)film,polymide oligomers were synthesized by using 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane(6FAP),2-(4-aminophenyl)-5-aminobenzimidazole(BIA),and 3,3',4,4'-diphenylketotetraacetic anhydride(BTDA)as monomers.The oligomer was mixed with polyethylene glycol diacrylate(PEG400DA),crosslinking agent,and photoinitiator to obtain a PSPI after photocuring.The thermal properties of the PSPI film were investigated based on the content of the photosensitive active agent PEG400DA the influ-ence of hydrophilicity,mechanical properties,conductivity,and structure.The results show that the prepared films contain poly-imide characteristic peaks,and the intensity of the characteristic peak increases with the increase of PEG400DA content.When the PEG400DA content is 4 wt%,the thermal stability is optimal,and the initial weight loss temperature is 343.12℃.As the content of PEG400DA increases,the hydrophilicity gradually decreases.The tensile strength increases with the increase of PEG400DA content,but the elongation at break reaches its highest value at 17.73%when the PEG400DA content is 6 wt%.As the electric field intensity increases,the content of PEG400DA increases,and the conductivity current increases.When the mass fraction of PEG400DA is 8 wt%,the conductivity is too strong and it loses its practical value.Overall,when the mass fraction of photosensitizer is 6%,the performance of PSPI film is optimal.
polyimidephotosensitizerthermal stabilitytensile propertyhydrophilicityconductivity current
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