Citation:
GONG Fang-Hong, LIN Ming-De, WANG Xin, LU Lu-De, YANG Xu-Jie. Transport Behavior of Vinyl Silane in Polyethylene[J]. Chinese Journal of Applied Chemistry,
;2004, 21(12): 1277-1280.
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The relationship between the permeating amount and time of three vinyl silanes(vinyl trimethoxy silane:A171, vinyl tri-2-methoxyethoxysilane:A172, vinyl triethoxysilane:A151) in three different polyethylenes(LDPE, LLDPE, HDPE) was obtained by using a soak-weighing method. The diffusion coefficients at different temperatures were calculated according to Fick's law. Meanwhile, computer simulation of the diffusion behavior in above systems was carried out by using the finite differences method. The diffusion coefficients were also calculated. According to the Arrhenius equation, the activation energies of the diffusion of A171 in HDPE, LDPE, LLDPE were calculated to be 38.2, 24.0 and 22.0 kJ, respectively. This provides a convenient method for the evaluation of the soaking time in the grafting process of polyethylene with silanes.
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Keywords:
- polyethylene,
- vinyl silane,
- diffusion coefficient,
- finite differences
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