【摘 要】
：
The polyimide/silica(PI/SiO2) hybrid materials with high inorganic content are prepared from nano-meter silica and polyamic acid (PAA).Via high temperature (300℃), PAA become to PI by ring-close metat
【机 构】
：
Dpet.of Applied Organic Nano-Hybrid Materials Research,ITRI,Hsinchu,Taiwan
论文部分内容阅读
The polyimide/silica(PI/SiO2) hybrid materials with high inorganic content are prepared from nano-meter silica and polyamic acid (PAA).Via high temperature (300℃), PAA become to PI by ring-close metathesis.Because of the high content of silica, the hybrid material has a low coefficient of thermal expansion (CTE).Moreover, it enhances the youngs modulus, storage modulus, glass transition point (Tg) and coefficient of elasticity.When inorganic content up to 40%, CTE decrease to 36 ppm/℃ from 52 ppm/℃, storage modulus increase to 4049 MPa from 2425 MPa, Tg raise to 400 ℃ from 360 ℃, coefficient of elasticity promote to 3.5 GPa from 2.0 GPa.Obviously, we clearly see the effect of inorganic silica.
其他文献
Biodegradable Poly (latic acid) (PLA)/Poly(butylene succinate)(PBS) polyblend herein were blended by a melt-blending process to develop a biodegradable thermal plastic elastomer.The phase transitions
Polyvinyl alcohol-glycerol (PVA-G) and polyvinyl alcohol-D-sorbitol (PVA-D) polyblends were obtained by blending polyvinyl alcohol with different molecular weights (PVA17 and PVA24) and plasticizers (
In the world, the critical environmental pollution problem is petroleum chemistry waste.In the future tendency, the biodegradable materials is to substitute the traditional materials.Polylactic(PLA) a
Injection molding is one of the most important processing techniques by which blends are fabricated into plastic parts; the morphological anisotropy characteristic of injection-molded blends is primar
The biorenewability of Polylactide (PLA) is highly valued in terms of energy and carbon savings.The biodegradability of PLA, however, has limited its use toward the disposable applications, such as ag
In this study, the plant fibers and wasted fibers (pineapple leaf fiber, banana fiber and recycled disposable chopsticks fiber) with an average length from 2.3 to 3.9 mm were chemically modified by 3-
In the present work, delignification of biomass waste at a suitable temperature in aqueous ethanol without any catalyst was studied.Five organosolv ethanol lignin samples were preparated from pine, cy
This work investigated the effects of coating thickness and titanium dioxide (TiO2) dosage in polyurethane (PU) coating on solar reflective index, adhesion and thermal conductivity for wood/natural ru
A novel slioxane-imide containing benzoxazine BZ-Al (N,N-bis (N-phenyl3,4-dihydro-2H-benzo [1,3] oxazine)-5,5 -bis (1,1 ,3,3 -tetramethyl disiloxane-1,3-diyl) -bis-norborane-2,3-dicarboximide) was syn
A new solid state electrolyte (SPE) containing self-complementary material was successfully synthesized.The presence of the highly interacted selfcomplementary sites induces the resulted solid state p