Synthesis and dielectric properties of polyimide-titania hybrid composites
Küçük Resim Yok
Tarih
2008
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
A new class of polyimide-titania (TiO2) composites with chemical bonds between the polyimide and titania system has been synthesized by the sol-gel reaction and characterized. The hybrid composite films were obtained by the reaction of lysine-organotitane monomer, which is formulated as [(EtO)(3)Ti (lysinate)](2,) followed by polycondensation with dianhyride in N-methyl-2-pyrrolidone (NMP) solution, followed by heating at 100, 200, and 300 degrees C. The presence of chemical bonds between polyimide (PI) and titania has great effect on the properties of polyimide films, especially on their thermal and dielectric properties. The dielectric constants of the resultant nanocomposites are lower than the usual polyimide films due to the increased free volume and less polar Ti-O-Ti groups, and can be tuned by varying the molar ratio of tetraethoxysilane (TEOT) in the feed. The polyimide units offer additional advantages of imparting thermal and mechanical strength.
Açıklama
Anahtar Kelimeler
Titanium, polyimide, lysine, sol-gel, hybrid material, dielectric properties
Kaynak
Journal of Inorganic and Organometallic Polymers and Materials
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
18
Sayı
2
