Preparation and Characterization of Highly Heat-Resistant Organic-Inorganic Hybrid Materials Made from Two-Component Polydimethylsiloxane

• Published in: Molecular Crystals and Liquid Crystals Vol. 597; no. 1; pp. 59 - 64
• Main Authors: Aoki, Yusuke, Yoshioka, Ken
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 03.07.2014; Taylor & Francis Ltd
• Subjects: Alkoxides; Devices; Dielectric strength; Dielectrics; Heat resistance; Homogeneity; long-term thermal stability; Organic-inorganic hybrids; polydimethylsiloxane; Raw materials; Silicone resins; Thermal resistance; Titanium; Weight loss
• ISSN: 1542-1406; 1563-5287; 1527-1943
• DOI: 10.1080/15421406.2014.932224

Organic-inorganic hybrid materials made from polydimethylsiloxane (PDMS) have been studied as encapsulation materials for high-power devices because of their high dielectric strength, high heat resistance, and flexibility when compared to conventional elastomers. To improve the heat-resistant property, hybrid materials made from two PDMS components, PDMS terminated with silicon alkoxide Si 5 O 4 (OC 2 H 5 ) 12 (A-PDMS) and PDMS terminated with ethyl-acetoacetate-modified titanium alkoxide Ti(OCH 2 CH(C 2 H 5 )C 4 H 9 ) 4 (T-PDMS), were prepared. We found that the heat-resistant property of a hybrid material could be improved by adjusting the molar ratio between A-PDMS and T-PDMS. After heat treatment at 250°C for 1,000 h, the hardness and weight loss of the hybrid material made from A-PDMS and T-PDMS were under 60 degrees (on an Asker C durometer) and under 5.0%, respectively. The excellent long-term thermal stability of the hybrid material made from A-PDMS and T-PDMS can be attributed to the improved homogeneity of inorganic clusters and the decrease in unreacted functional groups in hybrids by using T-PDMS as a raw material.