Rheological Properties of Two-component Silicon Rubber During Cross-linking by Addition Reaction†

doi:10.7503/cjcu20140857

Abstract

Abstract:

The kinetic for two-component silicon rubber formed by addition reaction was studied by the rheological method. The influence of reaction temperature on reaction rate was also explored. The Oscillatory frequency has no influence on the study for the cross-linking process of two-component silicon rubber with rheological method. As the addition reaction going on, the cross-linking degree becomes bigger and the properties of system change from liquid properties dominate to solid properties dominate. With reaction temperature increasing, the cross-linking rate of silicon rubber quickens and less time is needed to finish the cross-linking reaction. Based on the relation between cross-linking velocity and the reaction temperature, the apparent activation energy of system can be obtained. Rheological method is suitable for studying the silicon rubber cross-linking process.

Key words: Silicon rubber, Two-comporment addition reaction, Cross-linking, Rheological property

CLC Number:

O631

TrendMD:

ZHANG Huanhuan, XU Donghua, GUAN Dongbo, YAO Weiguo, SHI Tongfei. Rheological Properties of Two-component Silicon Rubber During Cross-linking by Addition Reaction^†[J]. Chem. J. Chinese Universities, 2015, 36(4): 788.

Figures/Tables 8

Scheme 1 Chemical formulas of A component and B component of silicone gel E642#

Fig.1 1H NMR of A component(A) and B component(B) of silicone gel E642# in CDCl3

Fig.2 Storage modulus(G') and loss modulus(G″) versus strain γ ■ 0 ℃-beginning G'; □ 0 ℃-beginning G″; ● 0 ℃-finshed G'; ○ 0 ℃-finshed G″; ▲ 40 ℃-finshed G'; △ 40 ℃-finshed G″; ▼ 40 ℃-beginning G'; ▽ 40 ℃-beginning G″.

Fig.3 Storage modulus(G') and loss modulus(G″) plotted against t The temperature is 25 ℃, the strain is 1%. ● 0.1 rad/s, G'; ○ 0.1 rad/s, G″; ▲ 10 rad/s, G'; △ 10 rad/s, G″; ▼ 100 rad/s, G'; ▽ 100 rad/s, G″.

Fig.4 Reaction time dependence of G' and G″

Fig.5 Reaction temperature dependence of Vmax(A) and tc(B) and lnVmax dependence of T-1(C)

Fig.6 G' and G″ of samples at different time versus angular frequency(ω) The reaction temperature is 25 ℃ and the strain is 1%. a. 10 s, G'; b. 10 s, G″; c. 5010 s, G'; d. 5010 s, G″; e. 15210 s, G'; f. 15210 s, G″.

Fig.7 Reaction time dependence of G″ and XReaction temperature/℃: (A) 0; (B) 15; (C) 25; (D) 40.

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