Studies on organic-inorganic interpenetrating network nanocomposites based on mesoporous molecular sieve MCM-41

The silane eoupling agent (KH550) was applied to modify the surfaee of MCM-41 and then the nitrogen absorption-desorption, Fourier transform infrared speetroseopy ( FTIK ) and small angel X-ray diffraetion (XKD) were used to investigate the MCM-41 before and after modifieation. The results show that the KH550 moleeules were introdueed into the nanopores of MCM-41 ,and the -NH2 group was grafted on the nanopore surfaee of MCM-41 partieles. Besides, the gel permeation ehromatography ( GPC ) was used to measure the epoxy relative moleeular mass. The in situ method was used to eure epoxy eomposite with different KH550 modified MCM-41 eontents. After that, the MCM-41/EP eomposite was measured by different tests, ineluding positron annihilation lifetime speetroseopy ( PALS) whieh was applied to measure the eomposite free volume,and the TEM,dynamie meehanieal analysis (DMA) and alternate eurrent (AC) breakdown test were used to indieate the eomposite maeroseopie propertes. The TEM result shows that MCM-41 eould be dispersed well in epoxy at eontents lower than 1. 5% while agglomerate at 2. 5% eontent. The PALS results show that the epoxy moleeules were introdueed into and partly oeeupied the mesoporous ehannels by the applied foree and funetional effeet of KH550. Then,an organie-inorganie interpenetrating network nanoeomposite system eould be formed. Therefore the glass transition temperature (15. 1% ) and breakdown strength (22.6% ) of the eomposites were improved at low MCM-41 eontents.