材料工程
材料工程
재료공정
JOURNAL OF MATERIALS ENGINEERING
2009年
7期
43-46
,共4页
聚酰亚胺泡沫%热导率%静态法%动态法
聚酰亞胺泡沫%熱導率%靜態法%動態法
취선아알포말%열도솔%정태법%동태법
polyimide foam%thermal conductivity%static method%dynamic method
利用DMTA和自制热导测试仪测试了4种自制芳香族聚酰亚胺泡沫的玻璃化转变温度(Tg )、静态温度下的热导率(λ)和动态温度作用下的隔热性能;分析了一定厚度的聚酰亚胺泡沫的密度和温度影响热导率的规律;考察了聚酰亚胺泡沫在动态温度下的隔热性能.结果表明:单体(尤其是二胺)刚性越大,聚酰亚胺泡沫的玻璃化转变温度越高;在密度为50~140kg/m3范围内,聚酰亚胺泡沫的密度对热导率的影响较小;在温度为50~350℃范围内,温度的升高使聚酰亚胺泡沫的热导率增加;在动态温度下,聚酰亚胺泡沫表现出明显的热滞后性.
利用DMTA和自製熱導測試儀測試瞭4種自製芳香族聚酰亞胺泡沫的玻璃化轉變溫度(Tg )、靜態溫度下的熱導率(λ)和動態溫度作用下的隔熱性能;分析瞭一定厚度的聚酰亞胺泡沫的密度和溫度影響熱導率的規律;攷察瞭聚酰亞胺泡沫在動態溫度下的隔熱性能.結果錶明:單體(尤其是二胺)剛性越大,聚酰亞胺泡沫的玻璃化轉變溫度越高;在密度為50~140kg/m3範圍內,聚酰亞胺泡沫的密度對熱導率的影響較小;在溫度為50~350℃範圍內,溫度的升高使聚酰亞胺泡沫的熱導率增加;在動態溫度下,聚酰亞胺泡沫錶現齣明顯的熱滯後性.
이용DMTA화자제열도측시의측시료4충자제방향족취선아알포말적파리화전변온도(Tg )、정태온도하적열도솔(λ)화동태온도작용하적격열성능;분석료일정후도적취선아알포말적밀도화온도영향열도솔적규률;고찰료취선아알포말재동태온도하적격열성능.결과표명:단체(우기시이알)강성월대,취선아알포말적파리화전변온도월고;재밀도위50~140kg/m3범위내,취선아알포말적밀도대열도솔적영향교소;재온도위50~350℃범위내,온도적승고사취선아알포말적열도솔증가;재동태온도하,취선아알포말표현출명현적열체후성.
Experimental studies were undertaken to investigate glass transition temperature,thermal conductivity at static temperature and performance of thermal insulation at dynamic temperature of 4 kinds for aromatic polyimide foams by DMTA and self-made apparatus. The relationship of density,temperature between thermal conductivity of polyimide foams and performance of thermal insulation of polyimide foams at dynamic temperature were examined. The results show that stiffness of monomer (especially diamine) has influence on glass transition temperature of polyimide foams; the density of polyimide foams ranging from 50-140kg/m3 has little influence on thermal conductivity; with static temperature ranging from 50-350℃ rising, thermal conductivity of polyimide foams are also rising; at dynamic temperature, polyimide foams show hysteretic nature obviously.