Effects of PVB on the gelation behavior of BaTiO3-based dielectric particles and glass suspension

• Published in: Journal of the European Ceramic Society Vol. 23; no. 13; pp. 2315 - 2322
• Main Authors: CHO, Chae-Woong, CHO, Yong-Sang, YEO, Jeong-Gu, KIM, Jonghee, PAIK, Ungyu
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 01.12.2003
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Electrotechnical and electronic ceramics; Exact sciences and technology; Technical ceramics; Vinyl butyral polymer; Barium titanate; Green properties; Dielectric materials; Rheology; Gelation; Polymer; Particle suspension; Experimental study; Binders; Borosilicate glass; Oxide ceramics; Additive; Electronic packaging; Infrared spectrum; Microstructure; Electroceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(03)00087-6

The effect of polyvinyl butyral (PVB) resins on the gelation behaviour of BaTiO3-based dielectric particles and borosilicate glass particulate suspensions was investigated. Organic solvents, dispersant, binder and gelation modifier were used as processing additives in a low-temperature cofired ceramic fabrication process. The strong flocculation of the suspension without a modifier is attributed to the reaction and strong linkage between the boron in the borosilicate glass and the functional hydroxyl group of PVB resins, which was confirmed by FTIR spectroscopy and SEM. When the butyral content of PVB employed in each slurry formulation diminished by approximately 8%, it produced a concentrated suspension. The butyral content of PVB had a much greater impact on gelation than did the molecular weight of PVB. As the molecular weight of PVB was increased, the apparent viscosities of the slurries increased due to the broader chain length of higher molecular weight of PVB. According to the relative viscosity measurements, suspensions with both high and low PVB molecules had similar values. 29 refs.