TY - JOUR
T1 - Structural, dielectric and mechanical behaviors of (La, Nb) Co-doped TiO2/Silicone rubber composites
AU - Zeng, Yu
AU - Xiong, Chenhan
AU - Li, Jingxuan
AU - Huang, Zhiyong
AU - Du, Guoping
AU - Fan, Zhaoyang
AU - Chen, Nan
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China ( 21571095 , 51362020 ).
Publisher Copyright:
© 2021 Elsevier Ltd and Techna Group S.r.l.
PY - 2021/8/15
Y1 - 2021/8/15
N2 - Ceramic/polymer composites have great potential to achieve the concomitant enhancement of both dielectric constant and breakdown field while maintaining other superior properties of the polymer matrix, ideal for elastomer sensors, actuators, capacitive energy storage, and many other applications. However, material incompatibility between the ceramic filler and the polymer matrix often leads to void formation, particle aggregation and phase separation, with significantly degraded performance. Herein, through surface modification, co-doped TiO2 particles were uniformly dispersed and bridged onto the silicone rubber matrix via a silane coupling agent for fabricating composites via mechanical mixing and hot-pressing. The synthesized composites exhibit enhanced dielectric constant, increased from 2.78 to 5.06 when 50 wt% co-doped TiO2 particles are incorporated. Their dielectric loss is less than 0.001 in a broad frequency range. Theoretical modelling and experimental results reveal that the morphology and dispersion state of co-doped TiO2 particles were crucial to the dielectric properties of the silicone rubber-based composites. Besides, the composites are thermally stable up to 400 °C. Significantly increased tensile strength (612 kPa) and elongation at break (330%) were obtained for the composite incorporated with 30 wt% co-doped TiO2 particles, accompanied by a moderate increased elastic module (540 kPa). Such composites have the potential for different applications.
AB - Ceramic/polymer composites have great potential to achieve the concomitant enhancement of both dielectric constant and breakdown field while maintaining other superior properties of the polymer matrix, ideal for elastomer sensors, actuators, capacitive energy storage, and many other applications. However, material incompatibility between the ceramic filler and the polymer matrix often leads to void formation, particle aggregation and phase separation, with significantly degraded performance. Herein, through surface modification, co-doped TiO2 particles were uniformly dispersed and bridged onto the silicone rubber matrix via a silane coupling agent for fabricating composites via mechanical mixing and hot-pressing. The synthesized composites exhibit enhanced dielectric constant, increased from 2.78 to 5.06 when 50 wt% co-doped TiO2 particles are incorporated. Their dielectric loss is less than 0.001 in a broad frequency range. Theoretical modelling and experimental results reveal that the morphology and dispersion state of co-doped TiO2 particles were crucial to the dielectric properties of the silicone rubber-based composites. Besides, the composites are thermally stable up to 400 °C. Significantly increased tensile strength (612 kPa) and elongation at break (330%) were obtained for the composite incorporated with 30 wt% co-doped TiO2 particles, accompanied by a moderate increased elastic module (540 kPa). Such composites have the potential for different applications.
KW - B. Composite
KW - C. Dielectric properties
KW - C. Mechanical properties
KW - D. Co-Doped TiO
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U2 - 10.1016/j.ceramint.2021.04.245
DO - 10.1016/j.ceramint.2021.04.245
M3 - Article
AN - SCOPUS:85105734374
SN - 0272-8842
VL - 47
SP - 22365
EP - 22372
JO - Ceramics International
JF - Ceramics International
IS - 16
ER -