Parylene (poly paraxylylene) yog lub npe tseem ceeb rau polymers uas muaj ib hom tshuaj lom neeg hauv tsev thiab siv los ua conformal coatings hauv kev siv tiv thaiv. Cov txheej txheem lo txheej txheem ua rau cov khoom siv mus rau qhov roj-phase monomer thaum tsis tshua muaj siab. Los ntawm nqus dej, parylene condensations ntawm qhov khoom ntws hauv ib lub polycrystalline zam, muab ib txheej uas yog tiag tiag conformal thiab pinhole dawb.
Piv rau cov txheej txheem ua kua, qhov teeb meem ntawm lub ntiajteb txawj nqus thiab qhov chaw nruj yog qhov tsis txaus, yog li tsis muaj bridging, thin-tawm, pinholes, puddling, khiav tawm los yog hnyav.
Cov txheej txheem yuav siv nyob rau hauv chav tsev sov thiaj li tsis muaj thermal lossis mechanical stress ntawm cov khoom. Parylene yog lub cev ruaj khov thiab sib cav nyob rau hauv nws qhov chaw kub. Nws muab kev tiv thaiv zoo tshaj plaws los ntawm kev ya raws, tshuaj tsuag ntsev, tshuaj khov dej, corrosive, cov kab mob hauv plab thiab lwm yam kev kub ntxhov. Parylene muab coatings nrog kev sib txhuam coefficient li tsawg li 0.25 rau 0.30.
Cov coatings no yog tsim los ntawm polymerization ntawm para-xylene, uas yog tso rau hauv cov substrate los ntawm nqus dej. Li no lub txheej yog cov teeb, nyias, kev nyuab siab dawb thiab muaj cov khoom vaj khoom tsev zoo heev. Qhov txheej txheem yog siv rau cov khoom siv tiv thaiv uas tseem ceeb tshaj qhov kho kom zoo nkauj.
Parylene Hom
Cov parylenes yog cov polymers ntawm cov p-xylenes thiab lawv cov hloov chaw, ib txhia ntawm cov Parylene N, Parylene C thiab Parylene D. Cov tswvcuab yooj yim ntawm cov koob npe ntawm poly-p-xylylene yog Parylene N - ib yam nkaus, linear, crystalline khoom. Lwm cov neeg muag khoom lag luam (C thiab D) pib los ntawm tib lub monomer thiab raug hloov kho los ntawm kev hloov ntawm ib lossis ob qho uas muaj ntxhiab hydrogens nrog tshuaj chlorine.