Reinforcement Property in Silicon Sealant by Nano CaCO3 Particles

Abstract

Abstract: Reinforcement property of structural silicon sealant as a function of the size and loading of nano CaCO₃ particles has been investigated by mechanical measurement and DMA experiments. The tensile strength and elongation at break of silicone sealant were found greatly enhanced by nano CaCO₃ particles. The smaller the particle size, the higher the tensile strength and the elongation will be. The storage modulus is also remarkably increased with the increasing of CaCO₃ loading and decreasing of CaCO₃ particle sizes, as revealed by DAM. Two relaxation peaks are seen for silicon sealant. One is around 153 K, corresponding to the glass transition temperature(T_g), and the other is around 233 K, corresponding to the melting temperature(T_m). Both T_g and T_m increase with the increasing of CaCO₃ loading and decreasing of CaCO₃ particle sizes. DMA results suggest that the interaction between nano CaCO₃ particles and silicon sealant is quite strong. The molecular motion of silicon sealant is highly limited by the dispersed nano CaCO₃ particles.

Key words: Silicon sealant, Nano CaCO₃ particles, Enhancement

CLC Number:

O631

TrendMD:

WANG Yue-Lin, WU Qing, DU Rong-Ni, WANG Yong, GAO Xiao-Ling, FU Qiang. Reinforcement Property in Silicon Sealant by Nano CaCO₃ Particles[J]. Chem. J. Chinese Universities, 2002, 23(10): 2011.

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Reinforcement Property in Silicon Sealant by Nano CaCO₃ Particles

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