CAJ | 학술논문

通过在聚酰亚胺( PI )中分别添加笼型八氨基苯基硅倍半氧烷( OAPS )、笼型八苯基硅倍半氧烷( OPS)、梯形聚苯基硅倍半氧烷( PPSQ)和无机纳米SiO2,制备了4种含硅聚酰亚胺( PI/Si)复合膜。对PI/Si复合膜的相容性、力学性能、热性能和阻燃性能进行了研究。结果表明, OAPS与PI间展现出较好的相容性, PPSQ次之,而OPS, SiO2与PI的相容性较差；但相容性与复合膜的力学和热性能无明显的对应关系。 SiO2可提高PI的力学性能；PI/OAPS复合膜的Tg 最高；OAPS, PPSQ或SiO2的加入使PI复合膜的热稳定性稍有提高,而少量OPS的加入大大降低PI膜的热稳定性。这类PI/Si复合膜的显著特点是能够大幅提高PI膜的极限氧指数,含硅化合物能够增加PI燃烧后残炭量,使残炭的形貌得到显著改善。 PI/Si复合膜在燃烧过程中在表面形成一层白色含硅包裹层,起到隔热隔氧及保护内层有机物不被燃烧的作用。硅倍半氧烷对炭层形貌的改善显著,展现出比SiO2更好的阻燃性能。
통과재취선아알( PI )중분별첨가롱형팔안기분기규배반양완( OAPS )、롱형팔분기규배반양완( OPS)、제형취분기규배반양완( PPSQ)화무궤납미SiO2,제비료4충함규취선아알( PI/Si)복합막。대PI/Si복합막적상용성、역학성능、열성능화조연성능진행료연구。결과표명, OAPS여PI간전현출교호적상용성, PPSQ차지,이OPS, SiO2여PI적상용성교차；단상용성여복합막적역학화열성능무명현적대응관계。 SiO2가제고PI적역학성능；PI/OAPS복합막적Tg 최고；OAPS, PPSQ혹SiO2적가입사PI복합막적열은정성초유제고,이소량OPS적가입대대강저PI막적열은정성。저류PI/Si복합막적현저특점시능구대폭제고PI막적겁한양지수,함규화합물능구증가PI연소후잔탄량,사잔탄적형모득도현저개선。 PI/Si복합막재연소과정중재표면형성일층백색함규포과층,기도격열격양급보호내층유궤물불피연소적작용。규배반양완대탄층형모적개선현저,전현출비SiO2경호적조연성능。
Four kinds of polyimide( PI)/Si membranes were prepared using PI with octaphenylsilsesquioxane (OPS), octa(aminophenyl)silsesquioxane(OAPS), polyphenylsilsesquioxane(PPSQ) of ladder structure, and nano-silica(SiO2), respectively. Their morphologies were studied by scan electron miscroscope(SEM) and the mechanical properties were measured by tensile testing and the thermal properties were studied by dif-ferential scanning calorimetry( DSC) , thermogravimetric analysis( TGA) and limited oxygen index( LOI) . The SEM and XRD results of the PI/Si composites proved that there were good compatibility between PI and OAPS because the aminophenyl groups in OAPS could participate in the polymerization process of PI. The mechani-cal properties of PI/OAPS membrane were nearly the same with that of PI. And the addition of OPS or PPSQ decreased the PI mechanical properties sharply. DSC analysis implied that the additives could increase the glass-transition temperature( Tg ) a little and the Tg of PI/OAPS was the highest because the Si-O caged structures existed in the PI main chain. The addition of OAPS, PPSQ or SiO2 would improve the thermal sta-bility a little according to the TGA results. One interesting result is that the LOI of PI/Si membranes signifi-cantly increased compared with pure PI membrane. The LOI for PI/OPS membrane was 57%, while that for PI was 46. 5% only. The improvement was caused by the formation of a well covered silicate char structures after burning. And the LOI of the membranes of PI with polyhedral oligomeric silsesquioxanes are higher than PI/SiO2 .